Mercedes-Benz C-Class Service Bulletins (2024)

374 manufacturer communications on file.

• February 3, 2026•Document ID: 11028270

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI27.10-P-075869

  Date Added:

  February 4, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Only vehicles with a variable transfer case are affected. This can be identified through control unit N45 or N15/7 in the quick test. When accelerating with light load, vibrations or jolting sensation may come from the drivetrain. It may be mistaken for a harsh shift. Cause Modified oil quality of the transfer case over time Remedy 1. Check initial quick test for faults in the following control units. N45 or N15/7 - All-wheel drive (ARS) N127 - 'Drivetrain' (PTCU) control unit Y3/8 - Transmission control for 9-gear transmission (VGS) N3/10 - Engine electronics for combustion engine If faults are present: Process them as per the guided test in Xentry. If no faults are present: 2. Check the transmission oil level If the oil level is correct: 3. Unplug the connector for the transfer cases control unit and reassess the vehicle on a subsequent test drive If the complaint no longer occurs with the control unit disconnected: 4. Perform an oil change of the transfer case according to WIS specifications - Collect an oil sample of the original fluid 5. Complete all transfer case Tech-in processes located under VG Control Unit > Adaptations - Resetting the oil service data - Calibration of N15/7 5. Perform road test of vehicle to bring transmission to operating temperature ( >60C ) 6. Operate vehicle in full circle with steering at full lock - 5x to the left - 5x to the right Return the vehicle to the client and request they drive the vehicle for at least 200 miles and return if the concern is not resolved. The extended drive will ensure the clutches are properly conditioned with the new oil and should resolve the concern. If the concern continues to occur with the control unit disconnected or after the above steps have been performed, please submit a TIPS case to the Powertrain inbox with the following information: - Initial quick test with fault freeze frame data - Initial transmission EEPROM data - VGS and Transfer Case Control Unit Log (N45 or N15/7) - Photo of the original oil condition - What color was the fluid drained from the transfer case before the oil change? - Was an oil sample collected, and can you provide a photo of the original fluid? - What color and part number fluid was used during the oil change? - How far was the vehicle driven after?

  Associated Products (93)

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  Associated Documents

  • DownloadMC-11028270-0001.pdf↗
• January 31, 2026•Document ID: 11027902

  Over The Air
  EXTERIOR LIGHTING; ELECTRICAL SYSTEM

  Mfr Comm. #:

  OTA - 5497150

  Date Added:

  January 31, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the software for the Headlamp Range (HLI) control unit does not correspond to the latest series production configuration. As a result, adaptive lighting functions may not be available. Additionally, the following instrument cluster message may appear: "Adaptive High Beam Assist is not available" or "Digital Light: Functionality limited" MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit.

  Associated Products (12)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLE2024 Mercedes-Benz E-Class2024 Mercedes-Benz GLC-Class
  Associated Documents

  • DownloadMC-11027902-0001.pdf↗
• January 31, 2026•Document ID: 11027899

  Service Campaign
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  NCU - 2025040013

  Date Added:

  January 31, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the ME-SFI control unit software does not meet current production specifications. As a result, a check engine malfunction indicator lamp might erroneously be triggered. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the ME-SFI control unit software.

  Associated Products (27)

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  Associated Documents

  • DownloadMC-11027899-0001.pdf↗
• January 30, 2026•Document ID: 11027905

  Service Bulletin/Repair Instructions
  SUSPENSION

  Mfr Comm. #:

  LI32.25-P-079706

  Date Added:

  January 31, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint: Clattering noise from area of hood with steel suspension. Cause: Missing helical spring shim (blue part as shown in attached picture "Helical Spring Shim"). Remedy: Check whether the blue helical spring shim is installed. If NOT present: Install the spring shim. Replacement part is black. If present: Replace the blue shim with the aftersales part black shim. If noise is still not remedied after replacing shims, provide sound/video file to the Body, Chassis and Entertainment inbox.

  Associated Products (15)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLE2024 Mercedes-Benz E-Class2024 Mercedes-Benz GLC-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz GLC-Class2022 Mercedes-Benz C-Class
  Associated Documents

  • DownloadMC-11027905-0001.pdf↗
• January 30, 2026•Document ID: 11027904

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM; BACK OVER PREVENTION: WARNINGS

  Mfr Comm. #:

  LI54.65-P-080132

  Date Added:

  January 31, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist Inoperative" on Instrument Cluster 5. Cameras 6. Other Park Topics Cause Various root causes Remedy See attached diagnostic guide.

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  Associated Documents

  • DownloadMC-11027904-0001.pdf↗
• January 26, 2026•Document ID: 11027820

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI82.85-P-078722

  Date Added:

  January 27, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint The vehicle's position on the map is displayed far away from its actual position, e.g. the vehicle is displayed as being in the middle of the ocean. Note: No relevant DTC is displayed during the quick test. Cause The GNSS antenna is not correctly inserted at the GNSS connection (see picture in the attachment) in the head unit (A26/17). Remedy Insert the plug into the GNSS connection and ensure that the plug has engaged correctly.

  Associated Products (60)

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  Associated Documents

  • DownloadMC-11027820-0001.pdf↗
• January 23, 2026•Document ID: 11027796

  Service Bulletin/Repair Instructions
  STEERING

  Mfr Comm. #:

  LI46.15-P-070510

  Date Added:

  January 27, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Noises from the area of the steering column. - Creaking - Squeaking - Chattering - Humming - Grinding Cause At present, there are no known noise problems with the steering column. Remedy Check surrounding area of the steering column for possible noises. • Instrument panel support • Steering column switch module If noise only occurs when adjusting the steering column via electric actuation please perform: 1. Disassemble bellows of steering column tube module. 2. Move steering column entirely out and entirely down. 3. Grease steering column on green-marked positions with a suitable brush (find pictures in attachment). 4. Move column up 1/4 of the way and grease again. 5. Continue until upper limit stop is reached. 6. Then move steering column adjustment in all directions from limit stop to limit stop several times to work in the grease. 7. If noise does not resolve, perform above procedure again. 8. Then move steering column adjustment in all directions from limit stop to limit stop several times to work in the grease. 9. If noise still does not resolve, please open a TIPS case. For all other noises or if the above does not resolve, create a TIPS case Body, Chassis, and Entertainment inbox. Attach a detailed description of the noise complaint, images, and a recording of the noise. A detailed description includes: • Position of height and longitudinal adjustment when the noise occurs • If possible, locate affected component part on steering column • State any change in the noise when steering column component parts are touched (e.g. spring, etc.)

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  Associated Documents

  • DownloadMC-11027796-0001.pdf↗
• January 23, 2026•Document ID: 11027781

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI35.31-P-074854

  Date Added:

  January 23, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Noises from the rear axle differential, particularly when cornering slowly Cause Small quantity of water entering into oil of multiplate clutches at right and left Remedy Follow below steps to install vent hose A 177 350 02 03: (See attachment section for installation instructions with reference photos if needed) 1. Raise the vehicle with the vehicle lift 2. Detach the old breathers (2x) from the clutch housing right and left using a suitable tool (Figure 1) 3. Support rear axle differential 4. Remove the rear screw from the rear axle differential on the rear axle carrier (Figure 2) Note: pay attention to the position of the adjustment disc and mark it! 5. Lower rear axle differential 6. Clean the upper bore (Figure 6) on the left side of the rear axle carrier 7. Place the new vent hose with the Y-vent connector from right to left in front of the right rear axle shaft over the rear axle differential (Figure 3) 8. Slide the angle connectors onto the vent connections onto the rear axle differential on the left (Figure 4) and right (Figure 5) 9. Install the vent connection of the new line on the left side into the upper bore (Figure 6) of the rear axle carrier (Figure 7) 10. Attach the fastening clip (pre-assembled on the new bleed line) to the rear axle differential housing. (Figure 8) 11. Lift the rear axle differential and install the screw from the rear axle carrier (M14 torque 150 Nm) Note: pay attention to the position of the adjustment disc! Once new vent hose is installed: 1. Carry out oil change of clutch oil on left and right sides (Shell TF0870B). - DO NOT change the gear set oil (at center), since this is a long-life oil that is not related to the cause Return the vehicle to the customer and inform them that they must drive a distance of at least 250 km (155mi); The complaint should no longer occur.

  Associated Products (15)

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  Associated Documents

  • DownloadMC-11027781-0001.pdf↗
• January 21, 2026•Document ID: 11027782

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  LI00.01-P-078887

  Date Added:

  January 23, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint The intent of this document is to provide workshops with helpful technical reference language. • Commonly used acronyms in LI's and TIPS cases. • Control unit names, numbers, and how to identify. • Network/wiring architecture groups to baumuster quick reference. • Platform to baumuster quick reference. Cause Information only Remedy Acronyms: • AV = Actual Values • CU = Control Unit • CUL = Control Unit Log • DTC = Diagnostic Trouble Code • E-Stand = Fresh-up head unit boot software (found in head unit control unit log) • FUP = Fresh-up • FW = Firmware • HSVL = High Speed Video Line • HU = Head Unit • HW = Hardware • IPD = Injector Performance Data • ISU = Initial Start Up • LVDS = Low Voltage Differential Signal • NAG"x" = New Automatic Gearbox ("x" is the generation number, example: NAG3) • NSFT = Not Safe For Transport • MOPF = Model Facelift (Ex: 167 MOPF) • PiH = Plug-in Hybrid • P3 Hybrid = AMG Plug-in Hybrid with rear drive unit • SA Code = Sonderausstattungscode (Option Code) • SCN = Software Calibration Number • SW = Software • TCU = Telecommunication Control Unit (Hermes/Ramses/Etc...) • QT = Quicktest • XD = XENTRY Diagnosis Control Unit Identification: Refer to the attachment "Control Unit Nomenclature" for location of each. • Control Unit Name • Control Unit Number • Control Unit Short name • Control Unit Diogenes ("dy-oj-uh-neez") name - Control unit variant/family. Network/Wiring Architecture to Baumuster Quick Reference: Star 1 • 117, 156, 246 (MFA) • 166, 176, 221, 242, 246, 292 Star 2 • 205, 213, 238, 253, 257, 290 (MRA) • 117, 156, 246 (MFA) • 118, 177, 243, 247 (MFA2) • 167, 222, 292, 463, 465, 906 Star 3 • 294, 295, 296, 297 (EVA2) • 206, 214, 223, 236, 254 (MRA2) • 192 and 232 (MSA) • 907 Platform to Baumuster Quick Reference: MRA = "Mercedes-Benz Rearwheel Architecture": • 205 • 213 • 222 • 238 • 253 • 257 • 290 MRA2 = "Mercedes-Benz Rearwheel Architecture - Generation 2": • 206 • 214 • 223 • 236 • 254 MFA = "Mercedes-Benz Frontwheel Architecture" • 117 • 156 • 246 MFA2 = "Mercedes-Benz Frontwheel Architecture - Generation 2" • 118 • 177 • 243 • 247 EVA1.5 = "Electric Vehicle Architecture" • 243 EVA2 = "Electric Vehicle Architecture - Generation 2" • 294 • 295 • 296 • 297 MSA = "Mercedes-Benz Sport Architecture" • 192 • 232 MMA = "Mercedes-Benz Modular Architecture" • 174

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  Associated Documents

  • DownloadMC-11027782-0001.pdf↗
• January 16, 2026•Document ID: 11027751

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER

  Mfr Comm. #:

  LI83.30-P-079850

  Date Added:

  January 22, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy *Note - This Li does not apply if there are other Li's that apply to your concern OR you have a fault and/or guided test that leads to a root cause. AC Diagnosis (General) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and involved components/systems. Testing • Perform relevant diagnostic tests. Refrigerant Quantity • Record the amount of refrigerant recovered and compare it to the specified value (if applicable). • Forming Gas is the ONLY approved leak test method. (DYE is NOT approved) TIPS Case Submission Requirements/Warranty Claim Submission Requirements (Template attached to be used for submission of Warranty claim and/or TIPS case) Cooling Capacity Test (If System Has a Charge) *Note - TIPS case is only required if the root cause is not identified or other Li's/documents require a case to be open. Before Repairs Gauge Readings • High and Low pressure readings (from machine or separate gauges). Leak Detection (if applicable) • PPM of any leaks found. XENTRY Printouts • Climate control AVs. • HV compressor AVs (for heat and AC systems). Thermometer Readings • Left and right dash vents. • Center vent, footwell, and/or rear vents (if concern is localized). Ambient Conditions • Temperature and humidity from OCP AVs (if available). After Repairs Gauge Readings • High and Low pressure readings before and after repairs. Thermometer Readings • Left and right dash vents before and after. • Center vent, footwell, and/or rear vents before and after (if localized concern). Documentation • Complaint Analysis, Game/Players, and Testing Steps. • Include expected results and technical justification for the diagnosis. • Avoid listing R/I steps—focus on diagnostic reasoning and root cause. • All prior measurements need to be documented on the repair order. OP code usage: 831232 - Max .5 for Cooling Capacity Test 831040 - Only to be utilized if you have a fault code and are actively diagnosing that fault code (MAX 1 hour) 831762 - This includes basic leak check 831285 - This can only be used in extenuating circumstances where a leak cannot be found (MAX 1 hour)

  Associated Products (145)

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  Associated Documents

  • DownloadMC-11027751-0001.pdf↗
• January 15, 2026•Document ID: 11027682

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER

  Mfr Comm. #:

  LI83.30-P-079850

  Date Added:

  January 16, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy AC Diagnosis (General) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and involved components/systems. Testing • Perform relevant diagnostic tests. Refrigerant Quantity • Record the amount of refrigerant recovered and compare it to the specified value (if applicable). • Forming Gas is the ONLY approved leak test method. (DYE is NOT approved) TIPS Case Submission Requirements/Warranty Claim Submission Requirements Cooling Capacity Test (If System Has a Charge) *Note - TIPS case is only required if the root cause is not identified or other Li's/documents require a case to be open. Before Repairs Gauge Readings • High and Low pressure readings (from machine or separate gauges). Leak Detection (if applicable) • PPM of any leaks found. XENTRY Printouts • Climate control AVs. • HV compressor AVs (for heat and AC systems). Thermometer Readings • Left and right dash vents. • Center vent, footwell, and/or rear vents (if concern is localized). Ambient Conditions • Temperature and humidity from OCP AVs (if available). After Repairs Gauge Readings • High and Low pressure readings before and after repairs. Thermometer Readings • Left and right dash vents before and after. • Center vent, footwell, and/or rear vents before and after (if localized concern). Documentation • Complaint Analysis, Game/Players, and Testing Steps. • Include expected results and technical justification for the diagnosis. • Avoid listing R/I steps—focus on diagnostic reasoning and root cause. • All prior measurements need to be documented on the repair order. OP code usage: 831232 - Max .5 for Cooling Capacity Test 831040 - Only to be utilized if you have a fault code and are actively diagnosing that fault code (MAX 1 hour) 831762 - This includes basic leak check 831285 - This can only be used in extenuating circumstances where a leak cannot be found (MAX 1 hour)

  Associated Products (140)

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  Associated Documents

  • DownloadMC-11027682-0001.pdf↗
• January 14, 2026•Document ID: 11027656

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI54.10-P-080199

  Date Added:

  January 14, 2026

  Manufacturer:

  MERCEDES-MAYBACH

  Summary

  Complaint For the potentially affected vehicles, excessively high aging of the battery was calculated at cold battery temperatures (<10°C) and the MIL activated accordingly, even though there is no corresponding high level of aging physically. In this regard, the fault code P0A7F00 "The age limit of the hybrid/high-voltage battery module has been reached" is displayed in the N127 PTCU control unit and/or A66 battery module control unit (48 V battery). Cause Faulty computation of the age limit of the 48 V battery. Remedy Step 1: Software update of A66 battery module (48 V battery) Step 2: Perform reset routine: 2.1 Read out actual value 056 in A66 control unit (age limit SOH-R) a. If SOH-R <= 125%: Delete fault memory in PTCU control unit (N127) and 48 V battery (A66). Process ended. b. If SOH-R > 125%: Drive for 60 min to add SOH-R value. 2.2 Read out actual value 056 in A66 control unit (age limit SOH-R) a. If SOH-R <= 125%: Delete fault memory in PTCU control unit (N127) and 48 V battery (A66). Process ended. b. If SOH-R > 125%: Park vehicle > 12 hours in the workshop at a warm ambient temperature > 15°C, then drive for 60 min. 2.3 Read out actual value 056 in A66 control unit (age limit SOH-R) a. If SOH-R <= 125%: Delete fault memory in PTCU control unit (N127) and 48 V battery (A66). Process ended. b. If SOH-R > 125%: Create TIPS case

  Associated Products (18)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz E-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz S-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz E-Class2023 Mercedes-Benz GLC-Class2023 Mercedes-Benz S-Class2022 Mercedes-Benz C-Class2022 Mercedes-Benz S-Class2021 Mercedes-Benz S-Class
  Associated Documents

  • DownloadMC-11027656-0001.pdf↗
• January 12, 2026•Document ID: 11027596

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI01.00-P-078172

  Date Added:

  January 13, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Dull thumping noise or ticking noise under the vehicle in the area of the engine/two-mass flywheel/transmission. Is significantly perceptible at the front right wheel well and can also be faintly heard in the vehicle interior. Cause The ticking noise occurs in idle operation in drive program C & S at 780 rpm when the state of charge of the battery is over 65% and the load requirement at the belt-driven starter alternator is simultaneously over 25 Nm. The load requirement can occur due to a number of auxiliary consumers (e.g. air conditioning system, steering wheel or seat heating, etc.). Remedy Check the software version on N127 (PTCU) and N15/15 (transmission) and update if an update is available. Software change: Adaptation of the idle speed and thereby reduction of the intensity of the noise. If the problem persists, the cause is design-related and therefore corresponds to the series production configuration. Replacing parts does not remedy the problem. Note: The noise is not caused by damage or a defect. It also has no negative effects over the operating time.

  Associated Products (11)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz SL-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz SL-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz SL-Class
  Associated Documents

  • DownloadMC-11027596-0001.pdf↗
• January 12, 2026•Document ID: 11027595

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI01.00-P-078171

  Date Added:

  January 13, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Dull thumping noise or ticking noise under the vehicle in the area of the engine/two-mass flywheel/transmission. Is significantly perceptible at the front right wheel well and can also be faintly heard in the vehicle interior. Cause The ticking noise occurs in idle operation in drive program C (when the combustion engine is running) & S at 780 rpm when the state of charge of the battery is under 25% and the load requirement at the belt-driven starter alternator is simultaneously over 25 Nm. The load requirement can occur due to high basic consumers (e.g. electric refrigerant compressor, high-voltage booster heater or DC/DC converter) and auxiliary consumers (e.g. air conditioning system, steering wheel or seat heating, etc.). Remedy Current production configuration Do not replace any parts Create TIPS case and send to HQ together with the following documents: • Videos of the problem from the exterior and in the vehicle interior • Control unit log, engine N3/10 (ME) • Control unit log, drivetrain N127 (PTCU) • Control unit log, battery management system N82/10 (BMS) • Control unit log, DC/DC converter N83/1 (DDW) • Control unit log, electronic ignition lock N73 (EZS)

  Associated Products (5)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz GLC-Class2024 Mercedes-Benz C-Class
  Associated Documents

  • DownloadMC-11027595-0001.pdf↗
• January 10, 2026•Document ID: 11027583

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI47.70-P-076030

  Date Added:

  January 10, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint After the charging process is complete, an instrument cluster message with a charging error appears and FC P0CFE00 is stored in control unit "N83 - AC charger for high-voltage battery (SG-LG)". The instrument cluster message and the FC memory entry can also appear at the beginning of the charging pause during delayed charging. Both only occur in combination with active pre-entry climate control. Cause Software in control unit "N83 - AC charger for high-voltage battery (SG-LG)". Remedy For model series 206 and 223 with code 802: Perform SCN coding in control unit "N83 - AC charger for high-voltage battery (SG-LG)". Please do not replace any parts even if the FC P0CFE00 coding continues to appear after successfully completing this step. A new software fix is currently in development and will likely be published in 01/2026. Replacing parts will not remedy the issue. For model series 243: The correction is already available. Perform a software update and SCN coding for the control units "N116/5 - Direct current charging connection unit (DCCU)" and "N83/11 - AC charger for high-voltage battery (SG-LG)" in order to remedy the problem.

  Associated Products (40)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz EQB-Class2025 Mercedes-Benz GLB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLA-Class2024 Mercedes-Benz E-Class2024 Mercedes-Benz EQB-Class2024 Mercedes-Benz GLB-Class2024 Mercedes-Benz GLC-Class+ 20 more
  Associated Documents

  • DownloadMC-11027583-0001.pdf↗
• January 7, 2026•Document ID: 11027566

  Service Bulletin/Repair Instructions
  VISIBILITY/WIPER

  Mfr Comm. #:

  LI83.30-P-079850

  Date Added:

  January 9, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy AC Diagnosis (General) Initial Steps Verify Customer Concern • Confirm the issue reported by the customer. Compare to Like Vehicle • Determine if the behavior is normal by comparing with a similar vehicle. Determine Your Game and Players • Identify the diagnostic strategy and involved components/systems. Testing • Perform relevant diagnostic tests. Refrigerant Quantity • Record the amount of refrigerant recovered and compare it to the specified value (if applicable). • Forming Gas is the ONLY approved leak test method. (DYE is NOT approved) TIPS Case Submission Requirements Cooling Capacity Test (If System Has a Charge) Before Repairs Gauge Readings • High and Low pressure readings (from machine or separate gauges). Leak Detection (if applicable) • PPM of any leaks found. XENTRY Printouts • Climate control AVs. • HV compressor AVs (for heat and AC systems). Thermometer Readings • Left and right dash vents. • Center vent, footwell, and/or rear vents (if concern is localized). Ambient Conditions • Temperature and humidity from OCP AVs (if available). After Repairs - Warranty Submission Requirements on the Repair Order Gauge Readings • High and Low pressure readings before and after repairs. Thermometer Readings • Left and right dash vents before and after. • Center vent, footwell, and/or rear vents before and after (if localized concern). Documentation • Complaint Analysis, Game/Players, and Testing Steps. • Include expected results and technical justification for the diagnosis. • Avoid listing R/I steps—focus on diagnostic reasoning and root cause. • All prior measurements need to be documented on the repair order. OP code usage: 831232 - Max .5 for Cooling Capacity Test 831040 - Only to be utilized if you have a fault code and are actively diagnosing that fault code 831762 - This includes basic leak check 831285 - This can only be used in extenuating circumstances where a leak cannot be found

  Associated Products (138)

  2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz CLA-Class2026 Mercedes-Benz CLE2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLA-Class2026 Mercedes-Benz GLB-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLA-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz EQB-Class2025 Mercedes-Benz G-Class2025 Mercedes-Benz GLA-Class2025 Mercedes-Benz GLB-Class+ 118 more
  Associated Documents

  • DownloadMC-11027566-0001.pdf↗
• December 20, 2025•Document ID: 11026833

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI27.35-P-080160

  Date Added:

  December 24, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint (Original LI document #: LI27.35-P-079039) Clicking noises from the electro-hydraulic control unit (EHS) when the vehicle is stationary and ECO Start/Stop is active (combustion engine is off). The noise is more noticeable outside the vehicle and in acoustically shielded areas such as closed rooms or garages. Cause The noise in the valve body (EHS) is caused by superimposed pressure peaks acting on the valves. This phenomenon occurs only after a certain running-in period due to the influence of micro-contamination in the valve bores. Remedy A hardware modification of the electro-hydraulic control unit (EHS) is currently being implemented (no change to the part number). This will be incorporated into series production and as a spare part starting from 12/2025. This is only a comfort-related complaint and has no impact on the functionality or service life of the transmission. For sensitive customers, the following measures can be performed: 1. Replace the electro-hydraulic control unit (EHS), the oil pan, and the transmission fluid. - Ensure all oil guide pipes are installed in the new valve body to prevent a new concern after replacement. (See attached location guide)

  Associated Products (104)

  2026 Mercedes-Benz AMG GT2026 Mercedes-Benz C-Class2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2026 Mercedes-Benz GLS-Class2026 Mercedes-Benz SL-Class2025 Mercedes-Benz AMG GT2025 Mercedes-Benz C-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz G-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz GLS-Class2025 Mercedes-Benz S-Class2025 Mercedes-Benz SL-Class2024 Mercedes-Benz AMG GT2024 Mercedes-Benz C-Class2024 Mercedes-Benz E-Class2024 Mercedes-Benz G-Class+ 84 more
  Associated Documents

  • DownloadMC-11026833-0001.pdf↗
• December 18, 2025•Document ID: 11026834

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI47.70-P-076030

  Date Added:

  December 24, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint After the charging process is complete, an instrument cluster message with a charging error appears and FC P0CFE00 is stored in control unit "N83 - AC charger for high-voltage battery (SG-LG)". The fault message and the fault memory entry can also appear at the beginning of the charging pause during delayed charging. Both only occur in combination with active pre-entry climate control. Cause Software in control unit "N83 - AC charger for high-voltage battery (SG-LG)". Remedy For model series 167, 214, 254 and 223 with code 802: Perform SCN coding in control unit "N83 - AC charger for high-voltage battery (SG-LG)". Please do not replace any parts even if the FC P0CFE00 coding continues to appear after successfully completing this step. A new software is currently in development and will become available in late 01/2026. Replacing parts will not remedy the issue. For model series 243: The correction is already available. Please inform the workshop to perform a software update and SCN coding for the control units "N116/5 - Direct current charging connection unit (DCCU)" and "N83/11 - AC charger for high-voltage battery (SG-LG)" in order to remedy the problem.

  Associated Products (29)

  2026 Mercedes-Benz C-Class2026 Mercedes-Benz E-Class2026 Mercedes-Benz GLC-Class2026 Mercedes-Benz GLE-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz E-Class2025 Mercedes-Benz EQB-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz GLE-Class2025 Mercedes-Benz S-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz E-Class2024 Mercedes-Benz EQB-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz GLE-Class2024 Mercedes-Benz S-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz E-Class2023 Mercedes-Benz EQB-Class2023 Mercedes-Benz GLC-Class+ 9 more
  Associated Documents

  • DownloadMC-11026834-0001.pdf↗
• December 15, 2025•Document ID: 11026609

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI01.00-P-078172

  Date Added:

  December 15, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Dull thumping noise or ticking noise under the vehicle in the area of the engine/two-mass flywheel/transmission. Is significantly perceptible at the front right wheel well and can also be faintly heard in the vehicle interior. Cause The ticking noise occurs in idle operation in drive program C & S at 780 rpm when the state of charge of the battery is over 65% and the load requirement at the belt-driven starter alternator is simultaneously over 25 Nm. The load requirement can occur due to a number of auxiliary consumers (e.g. air conditioning system, steering wheel or seat heating, etc.). Remedy Do not replace any parts Check whether a software update for N127 (PTCU) and N15/15 (transmission) is available. If no software update is available, then the vehicle has the latest SW and the vehicle should be released.

  Associated Products (8)

  2025 Mercedes-Benz C-Class2025 Mercedes-Benz GLC-Class2025 Mercedes-Benz SL-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz GLC-Class2024 Mercedes-Benz SL-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz SL-Class
  Associated Documents

  • DownloadMC-11026609-0001.pdf↗
• December 12, 2025•Document ID: 11026607

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  LI82.85-P-079530

  Date Added:

  December 15, 2025

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint The following most common complaints may be observed: • Brief connectivity interruptions when using Apple CarPlay over Wi-Fi • Audio cuts out • Device not recognized • No operation possible Cause There are multiple possible causes for an iPhone disconnecting from a vehicle’s head unit while using Apple CarPlay. These include hardware, software, and environmental factors: Environmental Interference: External Sources: • Passing under toll bridges, driving near airports, or areas with heavy electronic interference can cause connection drops. Cellular Networks: • Interference from nearby cell towers operating on similar frequencies (usually 2.4GHz or 5GHz) can disrupt the signal. Storage Location: • Keeping your phone in a handbag or surrounded by other objects inside the vehicle can create physical or electronic interference. Device and Software Topics: Head Unit Software/Hardware: • Hardware causes or outdated firmware in the vehicle’s head unit can prevent a stable connection. iPhone Software/Hardware: • Similar causes in the iPhone, including outdated iOS versions or hardware causes, may affect performance. Reset or Reboot: • Automatic rebooting or resetting of either the head unit or the iPhone will temporarily disrupt CarPlay. Connection and Settings: Wired Connections • Cables: A compromised or poor-quality iPhone-USB cable can cause intermittent or total loss of connection. • USB Ports: Dust, debris, or physical deformation in the USB port of either the head unit or the iPhone can also lead to disconnects. Wireless Connections: • Intermittent Bluetooth/Wi-Fi: Unstable wireless communication (Bluetooth/Wi-Fi) can frequently break the Car- Play connection. Power Management: • Battery Saver Mode: Enabling low power mode may restrict background processes, affecting CarPlay. • Vehicle’s Electrical System: Unstable power delivery from the car’s battery or electrical interruptions can cause the head unit to malfunction. Phone & App Configuration: Phone Settings: • Settings (especially Bluetooth or Wi-Fi) on your iPhone can interfere with the CarPlay link. Third-Party Apps/Profiles: • Installed apps or configuration profiles may conflict with CarPlay’s operation. • Native apps are apple maps, apple music, audio books, apple news, podcasts, messages and phone. All other apps are considered third party apps. App Conflicts: • Running conflicting apps that require similar system resources as CarPlay can cause instability. Mobile Data Plan: • Streaming from online sources without sufficient mobile data can result in lost connectivity. Other Factors: Heat & Overheating: • If either the phone or the head unit overheats, they may disable certain functions to prevent damage, leading to disconnection. User Actions: • Accidentally disconnecting the device in settings, or physically moving or bumping the phone or cable, may disrupt the connection. Remedy Guided Diagnostic Path for Apple CarPlay Connection Issues Please follow the steps below to systematically diagnose and resolve CarPlay concerns: Update Devices: • Ensure the iPhone is updated to the latest available iOS version. • Ensure the vehicle’s head unit is updated to the latest software version available. Isolate the Issue: • Check whether the symptom persists with another iPhone running the latest iOS version. • Test both wireless and wired CarPlay connections: • Does the issue only occur with wireless CarPlay? • Does the wired connection to the phone function correctly? Further Troubleshooting Steps: • Reboot the iPhone. • Reboot the head unit via the settings menu (user data reset). • Remove saved CarPlay connections • Delete the head unit information from the iPhone (see attached video for guidance). • Delete the iPhone from the head unit’s list of paired devices. • Remove the head unit entry from CarPlay settings on the iPhone. • Re-initiate pairing between the head unit and the iPhone to establish a new connection certificate. See attachment for complete text.

  Associated Products (13)

  2026 Mercedes-Benz GLC-Class2025 Mercedes-Benz C-Class2025 Mercedes-Benz CLE2025 Mercedes-Benz E-Class2025 Mercedes-Benz GLC-Class2024 Mercedes-Benz C-Class2024 Mercedes-Benz CLE2024 Mercedes-Benz E-Class2024 Mercedes-Benz GLC-Class2023 Mercedes-Benz C-Class2023 Mercedes-Benz GLC-Class2022 Mercedes-Benz C-Class2021 Mercedes-Benz C-Class
  Associated Documents

  • DownloadMC-11026607-0001.pdf↗