Mercedes-Benz Sprinter Service Bulletins (2020)

189 manufacturer communications on file.

• September 29, 2026•Document ID: 11038169

  Service Bulletin/Repair Instructions
  SERVICE BRAKES

  Mfr Comm. #:

  LI54_71_N_080985_1

  Date Added:

  October 6, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Brakes may lock up when reversing at slow speeds Complaint When reversing slowly, the vehicle erroneously triggers an emergency braking event, causing the brakes to lock up. Engine may not start following a key cycle. Cause The vehicle triggers a maneuvering or emergency braking event while reversing. The customer must then immediately park the vehicle (ignition Switched OFF) The hydraulic pressure release process within the ESP control unit may not be completed. Remedy Updating the software release of the RVC177 reversing camera

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  • DownloadMC-11038169-0001.pdf↗
• September 26, 2026•Document ID: 11038718

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  LI47_00-N-069565_6_en

  Date Added:

  October 28, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Fuel Level Unchanged After Refueling Complaint The customer reports that the fuel gauge shows inaccurate readings or remains unchanged after refueling. Cause The fuel level display may be incorrect due to one or both of the following conditions: 1. The Fuel Supply Control Unit (FSCU) may not recognize a refueling event if the Controller Area Network (CAN) does not enter sleep mode. This may occur if the vehicle is refueled with the engine running, the ignition is switched on during refueling, or aftermarket or upfitter‑installed equipment keeps the vehicle powered. 2. The fuel level sensor float or sensor arm may be restricted by the low‑pressure fuel pump pickup tube, fuel lines, electrical wiring, or an incorrectly positioned component. The fuel level sensor may become stuck above or below the pickup tube and indicate an incorrect fuel level. Similar FSCU actual values do not rule out a mechanical restriction. The fuel level sensor may be physically held at an incorrect position while the two actual values remain similar.

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  Associated Documents

  • DownloadMC-11038718-0001.pdf↗
• September 19, 2026•Document ID: 11038170

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  LI82_85_N_080972_1

  Date Added:

  October 6, 2026

  Manufacturer:

  DODGE

  Summary

  Unavailability of MB Apps Complaint A popup is seen on the HU with the message "data connection temporarily not available". Cause MB Apps is officially sundowned for all vehicles with NTG5 Head Unit Variant. Remedy No support available for NTG5 Head Unit Variants for MB App related topics.

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  • DownloadMC-11038170-0001.pdf↗
• August 26, 2026•Document ID: 11036855

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI28_00-N-079097_1_en

  Date Added:

  September 4, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Complaint While driving through muddy / sandy/ off road terrain "4Matic Currently Unavailable" message on the dash Cause This vehicle is not equipped with a fixed force distribution AWD, rather force is only applied to the front axle according to ESP calculations. As per GF28.00‑D‑ 9900A: "vehicles with 4MATIC all‑wheel system and variable force distribution, an electronically regulated multiplate clutch integrated into the transfer case provides for the torque distribution. If the multiplate clutch is open during normal driving operation, only the rear axle drives the vehicle. If the clutch is closed, the front axle comes into play." The message "All‑wheel drive temporarily unavailable" is not indicative of a malfunction but rather informs the driver that all‑wheel drive is currently not available due to the transfer case clutch overheating. This occurs when the vehicle is driven in such a way that maximum front axle torque is needed for an extended period, causing the clutch to get excessively hot. If the vehicle is being driven under heavy load conditions, like in deep sand or snow, the rear axle may slip while the front axle does not deliver power. The transfer case then attempts to distribute torque to correct the slip, but it is limited to a maximum of 1150 Nm to protect the front axle transmission. In extended heavy‑load scenarios, the multidisk clutch in the transfer case slips, increasing the temperature. If the temperature model detects a critical temperature of 240°C, the system protects itself by disconnecting until it cools down to around 160°C, after which the all‑wheel drive becomes available again and the warning message disappears.Vehicles can handle flat terrain easily, but steep slopes or situations where wheels slip might cause additional resistance, leading to the described protection events and message in the dash. Remedy Recommendation is to release the vehicle back to the client with an explanation that the vehicle is operating as designed. Please advise the client to limit vehicle acceleration in limited traction situations to avoid disabling of the 4Matic system ‑ please see "Notes on all‑wheel drive" provided in the operators manual.

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  Associated Documents

  • DownloadMC-11036855-0001.pdf↗
• August 5, 2026•Document ID: 11036846

  Service Bulletin/Repair Instructions
  FUEL/PROPULSION SYSTEM

  Mfr Comm. #:

  LI07_02-N-079573_2_en

  Date Added:

  September 3, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Oil Leak at Crankcase Near the High-pressure Fuel Pump OM654 Complaint Visible oil leak at the crankcase near the mounting area of the high‑pressure fuel pump on OM654 engines. Cause Oil leakage near the high‑pressure fuel pump may result from insufficient sealing performance of the jump shaft seal and/or reduced sealing effectiveness at the interface between the high‑pressure fuel pump and crankcase. Relative movement of the high‑pressure fuel pump within the crankcase bore may reduce sealing effectiveness at the pump‑to‑crankcase interface and promote oil migration during engine operation. Remedy Install a new high‑pressure fuel pump together with the design‑optimized sealing ring.

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  • DownloadMC-11036846-0001.pdf↗
• July 17, 2026•Document ID: 11035562

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI33_30-N-080795

  Date Added:

  August 3, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Model 907 with all-wheel drive (A4M) – All-wheel drive inoperative Complaint The customer may report one or more of the following: • All-wheel drive is unavailable or inoperative. • Rear wheel slip during acceleration on low-traction surfaces. • Noise from the front axle area while driving. • Message in the instrument cluster indicating all-wheel drive is unavailable due to overheating. • Fault code P27874B - The temperature of the clutch is too high. There is a fault due to overtemperature may be stored in control unit N15 (Transfer Case). Cause An internal failure of the front axle differential may result in loss of torque transfer to the front wheels. In some cases, a fracture of the weld between the crown gear and differential housing may be present. Remedy Replace the front axle differential in accordance with: AR33.30-D-0525TSY – Replace Front Axle Differential.

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  Associated Documents

  • DownloadMC-11035562-0001.pdf↗
• July 1, 2026•Document ID: 11035563

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  LI54_30-N-080701

  Date Added:

  August 3, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  ASSYST PLUS service reminder appears earlier than expected due to vehicle operating conditions Complaint The ASSYST PLUS service reminder appears earlier than expected. The customer or dealer may report that the vehicle did not reach the starting maintenance interval shown in vehicle documentation, option coding, sales literature, or the Owner's Manual. The service reminder may appear significantly earlier than anticipated even though no faults are stored and no malfunction is present in the vehicle. The remaining distance and remaining time continue to decrease normally until the service reminder is displayed. Cause This condition is not caused by a malfunction of ASSYST PLUS. ASSYST PLUS is a dynamic maintenance management system that continuously evaluates vehicle usage and opera-ting conditions to determine maintenance requirements. The starting maintenance interval specified by variant coding represents a maximum interval that may only be achieved under favorable operating conditions. Actual maintenance intervals may be significantly shorter depending on vehicle use. Vehicle operating conditions such as driving conditions, engine load, engine operating conditions, idling, short-trip operation, environmental influences, oil aging, and Diesel Particulate Filter (DPF) regeneration activity may reduce the maintenance interval from its starting value. These conditions may accelerate engine oil aging through increased soot loading, fuel dilution, moisture accumulation, and additional engine operating stress. As a result, the remaining distance and remaining time until the next service may be reduced from the starting maintenance interval. Remedy Do not replace any parts. A due service must be assumed if the maintenance data calculated by ASSYST PLUS indicates that service is required.

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• June 16, 2026•Document ID: 11034411

  Service Bulletin/Repair Instructions
  FUEL/PROPULSION SYSTEM

  Mfr Comm. #:

  LI47_00-N-069565

  Date Added:

  July 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Fuel Level Unchanged After Refueling Complaint The customer reports that the fuel gauge shows inaccurate readings or remains unchanged after refueling. Cause A. The Fuel Supply Control Unit (FSCU) fails to detect a refueling event B. The Fuel Level Sensor provides incorrect readings due to mechanical interference or installation issues

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  Associated Documents

  • DownloadMC-11034411-0001.pdf↗
• June 15, 2026•Document ID: 11034410

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI14.20-N-073867

  Date Added:

  July 2, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Complaint Complaint A: The engine is jolting/bucking between 1700 and 1900 rpm. Complaint B: One or more mechanical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of mechanical fault codes in table below. NOTE: If one or more electrical related fault codes for EGR Valve are also present in CDI, utilize Complaint C. Review list of electrical fault codes PDF document in attachments. Complaint C: One or more electrical related fault codes for EGR Valve stored in CDI control unit, with possible Check Engine Light. Review list of electrical fault codes PDF document attached. NOTE: This LI supersedes LI14.20-N-073813, which is no longer valid. Cause Cause of Complaint A: Increased friction between the EGR Valve blade and seat due to soot deposits causing a delay of the EGR Valve being able to reach the target value of the EGR Valve position controller. NOTE: This causes the EGR Valve blade and potentially the boost pressure controller to oscillate. Cause of Complaint B: Soot deposits between the EGR Valve blade and seat leading to the EGR Valve no longer being able to meet the de-sired target of the EGR Valve position controller. Cause of Complaint C: Internal EGR Valve or other electrical faults related to the EGR Valve function. Remedy Remedy for Complaint A: Perform the following steps: 1. Disable the EGR Valve (Y27/17) by disconnecting the electrical connector. 2. Perform a test drive to check if the jolting/bucking issue resolves. 3. If the jolting/bucking is resolved, proceed to Remedy for Complaint B. 4. If jolting/bucking is still present, proceed with diagnosis to determine the root cause. Consider checking the follo-wing, but not limited to: •EGR system including the EGR Cooler, EGR Bypass Flap, EGR Temperature Sensor, and pipes for proper operati-on, excessive sooting and/or clogging, as well as EGR Bypass Flap vacuum element, switchover valve, and vacuum system. •Visually check the leak oil line or T-piece; reference LI07.00-N-059118.

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  • DownloadMC-11034410-0001.pdf↗
• June 8, 2026•Document ID: 11034417

  Service Bulletin/Repair Instructions
  STRUCTURE:BODY

  Mfr Comm. #:

  LI80.20-N-079697

  Date Added:

  July 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Acoustic Warning or message occurring when a closed sliding door is not recognized Complaint Customer may state the warning message or indicator accompanied by acoustic tone alerting the sliding door is ajar when the door is completely closed Cause There are several reasons that lead to the failure occurring: - Mechanical damage through bending when loading and unloading - Worn contact plates --> After detachment of silver plating, the coper plate is corroded - Movement of sliding door/body when driving --> Contact pins do not always make contact with contact plate --> Central locking system fault message in instrument cluster Remedy In a problem case, replace contact switch for vehicles with +T50/+T55/+EL9 or contact plate with A4478201903. Remember to check the fit of the sliding doors and make any necessary adjustments as per AR72.16-S-1023E (447/448) and AR72.16-D-1023TS (907/910). Further valid damage codes: 82326 Contact switch for central locking system on sliding door 82347 Contact plate for central locking system on sliding door 53196 K/Z contact plate for central locking system on sliding door 82645 Contact switch for sliding door

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• June 2, 2026•Document ID: 11034412

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI00.20-N-080626

  Date Added:

  July 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint ASSYST values in XENTRY actual values and workshop menu of instrument cluster are implausibly excessive. Infor-mation: According to ASSYST values in XENTRY Diagnosis and the instrument cluster workshop menu, a larger jump (for example 20,000 km or 12,500 miles) has been detected within one ignition cycle that does not match the usual customer usage pattern/maintenance history. Cause Differences between the ASSYST memory in the control units for the drivetrain (N127) (CPC) and the instrument clus-ter (A1) (IC) Remedy 1. Connect 12 V charger (see AR54.10-D-1127TS for models 907). Note: An adequate voltage from the on-board electrical system battery must be guaranteed for the entire duration of the work procedure. Otherwise the control units could be damaged if an undervoltage occurs. Information: Observe the operating instructions of the 12 V charger. Information: Use the 12 V charger to ensure a sufficient voltage (minimum 12.5 V) from the on-board electrical system battery.

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  • DownloadMC-11034412-0001.pdf↗
• May 26, 2026•Document ID: 11033160

  Service Bulletin/Repair Instructions
  POWER TRAIN

  Mfr Comm. #:

  LI35.00-N-080267_1

  Date Added:

  June 2, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Sprinter 907 - Rear Axle Noise Diagnosis Best Practices Complaint Various noises from area of rear axle while driving Cause A: Howling Noises The high‑frequency howling noise is caused by the normal meshing behavior of the rear axle gear set, consisting of the pinion and crown gear. Two example noise recordings are provided in the attachment for reference. The volume and perception of this noise can vary depending on vehicle weight and load condition. Due to the current design of the Sprinter rear axle, it is not possible to completely isolate or decouple the the vibration generated by the normal meshing of the rear axle gears from the vehicle body. As a result, this noise may be transmitted into the vehicle interior. This noise is considered a normal characteristic of the rear axle design and vehicle operation. As it is not the result of a technical failure, component repairs or replacements will not lead to an improvement. There is no negative impact on the function, durability, service life, or operational safety of the rear axle. B: Other Noises: Noises that differ from the described howling characteristic (for example grinding, droning, or chattering noises) are not considered normal and may indicate a technical concern. Possible causes may include, but are not limited to: • Damaged bearings • Increased or abnormal gear wear • Excessive play within the differential Remedy Remedy for Cause A: Do not replace any components. This noise is considered a normal characteristic of the rear axle design and vehicle operation. Remedy for Cause B: If the noise does not match the described howling characteristic, the concern must be diagnosed and documented using the guidance below, with the results included in the warranty claim as applicable. Documentation of Concern: In many cases, the concern can be remedied using available replacement parts, and a complete rear axle assembly replacement is not necessary. However, due to parts availability, tool availability and workshop constraints, a complete assembly replacement may be performed in select cases to mitigate vehicle downtime. IMPORTANT: This is not intended to be the default repair approach. Component replacement must not be performed without diagnostic findings that clearly support a technical defect. Replacing rear axle components without confirmed abnormal findings may result in a debit of the warranty claim. This document does not guarantee warranty coverage and is designed to aid in diagnosis and subsequent resolution of the complaint. Create a file with all of your documents, findings, photos and sound files. 1. To ensure there is a clear understanding of the customer complaint, collect and document the following information: - When did the noise start? - Verify whether any previous repairs or work were performed prior to the onset of the noise. - Did the noise occur suddenly, or did it develop progressively over time? - Is the vehicle upfitted, modified, or retrofitted? (List all modifications) - Attach photos of any modifications or added equipment. - Under which conditions does the noise occur? (Provide all that apply) • Vehicle speed • Selected gear • Load condition • Outside ambient temperature and/or weather conditions • Engine and drivetrain temperature Diagnosis and Inspection: 2. Collect a video or sound file of the noise concern, ensure the video is available if requested. 3. Perform an NVH recording and store the .pp data file. The file must be available if requested during warranty review or parts inspection.

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  Associated Documents

  • DownloadMC-11033160-0001.pdf↗
• May 8, 2026•Document ID: 11033165

  Service Bulletin/Repair Instructions
  FUEL/PROPULSION SYSTEM

  Mfr Comm. #:

  LI49.20-N-078466_4

  Date Added:

  June 2, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Check engine light with fault code P3005CA in MRD1 (CDI) Complaint The check engine light is on, with a possiblility in a reduction of power and the presence of soot in the exhaust system. Fault code P3005CA: The diesel particulate filter efficiency is insufficient. Additional information: Additional fault codes may be present, related to the Diesel Particulate Filter (DPF) system or the Exhaust Gas Recirculation (EGR) system. Cause This fault code sets due to the following factors: 1. Damage to the Diesel Particulate Filter (DPF) unit. 2. The N74 (Soot Particulate Sensor Control Unit) identifies soot or debris located downstream of the SCR Catalyst (underbody). Remedy Note: The guided tests for fault code P3005CA have been revised in the XENTRY unit. It is important to complete these guided tests thoroughly. TIPS cases are NO longer required unless there is an absence of soot at the outlet of the Diesel Particulate Filter (DPF) unit. If there are any other fault codes present for component 'N74 (Soot Particulate Sensor Control Unit)', process these first. 1. Damage to the Diesel Particulate Filter (DPF) unit. • Complete the XENTRY guided tests: • Check the Exhaust system for leaks - Perform a visual inspection of the exhaust system from the Combustion Engine to Diesel Particulate Filter (DPF). Verify that there are no external damages and that all clamps and sensors are installed and leak-free. • Check component 'Exhaust pipe and Filter screen of Exhaust Gas Recirculation (low pressure)' for carbon fouling. If no soot is present at the Tailpipe outlet, recommended to separate the exhaust pipe downstream of the Diesel Particulate Filter (DPF) at the outlet to inspect.

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• April 29, 2026•Document ID: 11031942

  Service Bulletin/Repair Instructions
  FUEL/PROPULSION SYSTEM

  Mfr Comm. #:

  LI4700N069565

  Date Added:

  May 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint The customer reports that the fuel gauge shows inaccurate readings or remains unchanged after refueling. Cause A. The Fuel Supply Control Unit (FSCU) fails to detect a refueling event. B. The Fuel Level Sensor provides incorrect readings.

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  • DownloadMC-11031942-0001.pdf↗
• April 9, 2026•Document ID: 11031944

  Service Bulletin/Repair Instructions
  STRUCTURE:BODY

  Mfr Comm. #:

  LI91-18-N-080032

  Date Added:

  May 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Complaint Crease formation on genuine leather seat covers in vehicles with low mileage Cause • objects left on the seats for extended periods of time (pressure marks) • objects wedged between the seat backrest and seat cushion (e.g. seat belt buckle) • light initial creases due to vehicle handling • light creases in the outer covers originating from the production process (missing finish) Remedy Heat treatment of the seat covers using heat gun and plastic wedge (Please see provided video)

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  • DownloadMC-11031944-0001.pdf↗
• March 23, 2026•Document ID: 11030629

  Service Bulletin/Repair Instructions
  FUEL/PROPULSION SYSTEM

  Mfr Comm. #:

  LI49-20-N-080376

  Date Added:

  April 2, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  The check engine light is illuminated, or the AdBlue warning is active, with recorded faults related to AdBlue quality or concentration. Complaint Customer reports an illuminated check engine light and or an AdBlue system warning indicating AdBlue quality out of specification. The vehicle may enter reduced performance mode. One or more of the following fault codes related to the AdBlue tank may be stored: P206B31: Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31: Malfunction of the AdBlue fill level sensor; the signal is absent. P300494: The quality of the AdBlue is insufficient. Background AdBlue must meet ISO 22241 quality requirements. ISO 22241 urea content limits for AdBlue are 31.8 percent to 33.2 percent by mass. AdBlue begins to crystallize and freeze at approximately 12 degrees F. Freeze-thaw does not degrade the product when uncontaminated, and the bulk concentration returns to normal after complete thaw and mixing. Cause In cold soak conditions and during freeze thaw exposure, the tank contents may not be uniform at the time of sampling or system checks. During freezing and partial thaw, ice formation can temporarily create concentration gradients in the tank. As a result, urea percent readings can vary based on sample location and the state of thaw and mixing, which can produce apparent out of range readings even though the bulk fluid returns to normal after mixing. Remedy Testing Do not use a single urea percent reading taken from frozen, partially frozen, or not fully mixed AdBlue to make a repair or responsibility decision. Confirm full thaw and ensure tank contents are mixed before sampling. 1. Confirm full thaw - Confirm the AdBlue tank and associated components are fully thawed before sampling. - Do not sample slushy or partially frozen fluid. 2. Mix tank contents - Perform a road drive intended to mix the tank contents before sampling. - Idle time alone is not a reliable substitute for mixing. 3. Sample and measure - Take the sample and measure with the MB refractometer per the MB tool instructions. - Record the urea percent value. 4. Interpret the result against ISO 22241 limits - Within specification is 31.8 percent to 33.2 percent urea by mass. 5. Repeat if out of specification - If out of specification, repeat after an additional mixing drive to reduce sampling variation. - If still out of specification after full thaw, mixing, and repeat measurement, treat as a true out of specification result and proceed with further diagnosis per applicable MB guidance. Acceptance criteria AdBlue is within the ISO 22241 specification when the urea percent is between 31.8 percent and 33.2 percent by mass. Values outside this range are out of specification and require further diagnosis after completing the full thaw and mi-xing procedure above. Cross reference For vehicles with fault codes P206B31, P203B31, or P300494, refer to LI49.20-N-078838 for the detailed diagnostic and repair procedure. If a SCR or AdBlue warning reset is required after correction, refer to LI49.20-N-075995. Complete the diagnostic and corrective steps first. Perform the warning reset only after the underlying fault condition has been corrected. Warranty information and claim handling

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  • DownloadMC-11030629-0001.pdf↗
• March 23, 2026•Document ID: 11030627

  Service Bulletin/Repair Instructions
  FUEL/PROPULSION SYSTEM

  Mfr Comm. #:

  LI49-20-N-078838

  Date Added:

  April 2, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 present in AdBlue (SCR) control unit (N118/5) Complaint The check engine light or AdBlue warning is activated, accompanied by one or more of the following fault codes related to the AdBlue tank: P206B31 Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31 Malfunction of the AdBlue fill level sensor; the signal is absent. P300494 The quality of the AdBlue is insufficient. Cause A. The software for the AdBlue (SCR) control unit (N118/5) is outdated. B. The AdBlue concentration is outside ISO 22241 limits (below 31.8 percent or above 33.2 percent). C. Frozen or partially frozen AdBlue can cause the AdBlue level and concentration functions to report inaccurate values. D. The AdBlue level and concentration sensing functions in the tank are damaged. E. Cold soak and freeze thaw exposure can temporarily create concentration gradients in the tank and lead to sampling dependent readings until fully thawed and mixed. Important Before evaluating any AdBlue concentration result, follow LI49.20-N-080376 to confirm full thaw, perform a mixing drive, and retest. Do not use a single urea percent reading taken from frozen, partially frozen, or not fully mixed AdBlue for a repair or responsibility decision. Remedy A. Software 1. Verify no newer software is available for the AdBlue (SCR) control unit (N118/5). 2. If a software update is available, program the control unit per XENTRY guidance. 3. Only after the system is in proper working condition, complete LI49.20-N-075995 for AdBlue warning reset. Note: If there is no updated software available, print the XENTRY screen indicating this and proceed to section B. B. AdBlue concentration 1. Confirm full thaw and mixing per LI49.20-N-080376, then verify AdBlue concentration. a. Check concentration using the MB refractometer per the MB tool instructions and applicable WIS guidance. b. Use freeze frame data when applicable. 2. If AdBlue concentration remains below 31.8 percent or above 33.2 percent after full thaw, mixing drive, and retest, AdBlue replacement is required. Warranty and responsibility decisions must follow LI49.20-N-080376 warranty handling guidance and standard war-ranty policy. 3. If AdBlue concentration is within specification, proceed to section C. C. Frozen AdBlue or SCR actual values indicate frozen AdBlue 1. Check if AdBlue is frozen. If frozen, allow the vehicle to sit in a warm environment overnight and recheck. 2. With the vehicle running and XENTRY connected, display the actual AdBlue level values. 3. Drain the AdBlue tank and verify the displayed fill level reflects the change. 4. Fill the AdBlue tank slowly. Do not overfill. Verify the fill level reflects the change. Note: For model years 23 to 25, Fill Level Sensor 1 functions as the empty sensor and accurately measures only the bottom portion of the tank. Once the level is above the measurement range, the displayed value may fluctuate. This is nor-mal. 5. Reset the AdBlue tank fill level via XENTRY. Print the XENTRY pages showing that the fill up completed success-fully. 6. Only after the system is in proper working condition, complete LI49.20-N-075995 for AdBlue warning reset and print the XENTRY pages confirming the reset completed successfully. Note: If XENTRY still indicates frozen AdBlue or the concentration remains inaccurate after drain and refill and the thaw, mix, retest requirements were completed, proceed to section D. D. Damaged AdBlue level and concentration sensing functions 1. Replace the AdBlue tank as required by applicable MB guidance. 2. With the vehicle running and XENTRY connected, display the actual AdBlue level values. 3. Fill the AdBlue tank slowly. Do not overfill. Verify the fill level reflects the change. 4. Reset the AdBlue tank fill level via XENTRY. 5. Only after the system is in proper working condition, complete LI49.20-N-075995 for AdBlue warning reset.

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  • DownloadMC-11030627-0001.pdf↗
• March 23, 2026•Document ID: 11030626

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  LI49-20-N-075995

  Date Added:

  April 2, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 Complaint SCR or AdBlue warning message cannot be reset. All fault codes in the AdBlue (SCR) control unit have been processed and corrected, however fault codes P13DF00 or P300685 remain active and stored. Cause The procedure for resetting the SCR or AdBlue warning message with XENTRY Diagnosis has not been carried out. Note: If AdBlue quality or concentration related fault codes are present, such as P300494, P203B31, or P206B31, complete the applicable diagnostic procedure first. This includes the thaw, mixing drive, and retest requirements in LI49.20-N-080376 and the detailed diagnosis and re-pair steps in LI49.20-N-078838 as applicable. Do not attempt to reset the SCR or AdBlue warning message until the underlying fault condition has been corrected. Remedy Note: Do not replace any parts for an incorrectly executed reset procedure. 1. Connect the battery charger •Maintain adequate voltage throughout the procedure per applicable guidance. 2. Connect the diagnostic device •Use the latest version of XENTRY Diagnosis and Add-Ons. 3. Reset the SCR or AdBlue warning message using XENTRY Diagnosis •Quick test view → N118/5 – Selective Catalytic Reduction (SCR GEN4) → Special processes → Reset SCR/AdBlue® warning message. Note: Ensure all 5 listed processes are completed successfully, indicated by Actual value: "successfully completed". 4. Complete the disconnect and sleep mode initiation procedure •Disconnect XENTRY. •Refer to manual AD00.00-D-2000-06TS for the correct procedure to disconnect the diagnostic device from Model 907. •Disconnect the Battery Charger •Refer to manual AR54.10-D-1127TS for instructions on safely disconnecting the battery charger from Model 907. •Turn off the ignition. •Remove the key. •Lock the vehicle and wait approximately 15 minutes to allow the CAN bus system to enter sleep mode. 5. Post sleep mode vehicle start •After the 15-minute waiting period, start the vehicle. Note: The "starts remaining" message will remain on the Instrument Cluster (IC), but the vehicle will not be in the 5mph de-rate mode. 6. Drive for system self-test •Drive the vehicle for 5 to 10 miles to enable the SCR system to perform a self-test. Note: During the warning reset process, ensure the outside temperature sensor is reading above 10 degrees Fahrenheit. If not, keep the vehicle inside and repeat the reset. The vehicle may need to be driven to allow NOx sensors and the SCR system to complete their self-test before fault codes can be stored and then cleared. 7. Confirm and erase fault codes •Verify warning messages. •Ensure relevant fault codes are stored. •Erase fault memory if necessary. 8. Disconnect the Diagnostic Device •Refer to manual AD00.00-D-2000-06TS for the correct procedure to disconnect the diagnostic device from Model 907. 9. Disconnect the Battery Charger •Refer to manual AR54.10-D-1127TS for instructions on safely disconnecting the battery charger from Model 907.

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  Associated Documents

  • DownloadMC-11030626-0001.pdf↗
• February 24, 2026•Document ID: 11029273

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI4920N078838

  Date Added:

  March 3, 2026

  Manufacturer:

  FREIGHTLINER

  Summary

  Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 present in AdBlue (SCR) control unit (N118/5) Complaint The check engine light or AdBlue warning is activated, accompanied by one or more of the following fault codes related to the AdBlue tank: P206B31: Malfunction of the concentration sensor for AdBlue; the signal is absent. P203B31: Malfunction of the AdBlue fill level sensor; the signal is absent. P300494: The quality of the AdBlue is insufficient. Cause A. The software for the AdBlue (SCR) control unit (N118/5) is outdated. B. The concentration of AdBlue is either above or below the Mercedes-Benz specifications, which can lead to premature freezing. C. Frozen or partially frozen AdBlue can cause the AdBlue level sensor to misread levels. D. The AdBlue level sensor is damaged.

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  Associated Documents

  • DownloadMC-11029273-0001.pdf↗
• February 24, 2026•Document ID: 11029272

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  LI4920N075995

  Date Added:

  March 3, 2026

  Manufacturer:

  MERCEDES-BENZ

  Summary

  Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 Complaint Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset. Information: All fault codes in the AdBlue® (SCR) control unit have been processed and corrected; however, fault codes P13DF00 and P300685 remain active and stored in the AdBlue® (SCR) control unit. Cause The procedure for resetting the SCR/AdBlue® warning message with XENTRY Diagnosis has not been carried out. Information: Before resetting the SCR/AdBlue® warning message for SCR Generation 4, the AdBlue® system must be in proper working condition and tested.

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  Associated Documents

  • DownloadMC-11029272-0001.pdf↗