Mazda CX-50 Service Bulletins

354 manufacturer communications on file.

• April 16, 2026•Document ID: 11032101

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  SA-026-26

  Date Added:

  May 5, 2026

  Manufacturer:

  MAZDA

  Summary

  This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-002/19 09/30/19 and 12/19/19 DESCRIPTION If an engine assembly is replaced after a catastrophic internal mechanical failure, clean the intake manifold internally before installing a replacement engine assembly. If the intake manifold is not cleaned properly, the replacement engine may fail prematurely. Metallic debris from the old engine (with catastrophic internal mechanical failure) may rest inside the intake manifold. When the new engine assembly is installed, debris in the intake manifold will be ingested into the new engine and cause internal damage. Clean the intake manifold internally to remove any debris from old engine before installing the new replacement engine assembly. If the intake manifold cannot be properly cleaned internally, replace it.

  Associated Products (39)

  2026 Mazda CX-302026 Mazda CX-52026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32026 Mazda MX-52025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32025 Mazda MX-52024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda CX-902024 Mazda Mazda32024 Mazda MX-5+ 19 more
  Associated Documents

  • DownloadMC-11032101-0001.pdf↗
• April 15, 2026•Document ID: 11032102

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  SA-027-26

  Date Added:

  May 5, 2026

  Manufacturer:

  MAZDA

  Summary

  This SA supersedes the previously issued bulletin(s) listed below. The changes are noted below in Red. SA-007/25 10/22/25, 06/02/25 and 02/03/25 DESCRIPTION The Mazda DCA-8000 is required for all warranty battery testing. If the Mazda DCA-8000 is not used, incorrect battery testing may result in unnecessary battery replacement. Use the following test procedures in this Service Bulletin to test Mazda vehicle batteries and to generate a Warranty Code. NOTE: A Warranty Code is required for warranty claim submission Battery Identification (Mazda batteries have 2 rating types) 1. JIS (Japanese Industrial Standard): JIS codes are six-digit alpha-numeric markings (excluding i-STOP batteries e.g. Q-85, S-95) molded into the top of the battery to identify a battery by the capacity (amps), dimensions, and battery terminal type. Vehicles manufactured in Japan come from the factory with a JIS rated battery. NOTE: Replacement batteries may use a CCA rating. If so, use the CCA rating listed on the battery. 2. CCA (Cold Cranking Amps): CCA ratings are normally located on a sticker affixed to the top of the battery to indicate a battery’s Cold Cranking Amps. CCA rated batteries are supplied with domestically produced vehicles. NOTE: If an incorrect CCA rating is entered into the Mazda DCA-8000, it will result in a false result and invalid Warranty Code from the tester. This will also result in unnecessary replacement of batteries. TEST PROCEDURE 1. Connect the charger clamps to the appropriate battery posts.

  Associated Products (40)

  2026 Mazda CX-302026 Mazda CX-52026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32026 Mazda MX-52025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32025 Mazda MX-52024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda CX-902024 Mazda Mazda32024 Mazda MX-5+ 20 more
  Associated Documents

  • DownloadMC-11032102-0001.pdf↗
• April 4, 2026•Document ID: 11032100

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM; STRUCTURE:BODY

  Mfr Comm. #:

  SA-021-26

  Date Added:

  May 5, 2026

  Manufacturer:

  MAZDA

  Summary

  This Service Alert supersedes the previously issued SAs and bulletin(s) listed below: The changes are noted below in red. SA-010/23 02/09/23 DESCRIPTION Some customers may experience one or more electrical malfunctions after a vehicle body repair. A newly painted fender stay (2) may be causing a poor front harness (1) ground connection. The front fender stay (2) newly painted surface at ground point (3), where attachment bolt (4) is seated, may create a poor front harness ground connection. NOTE: DO NOT paint ground point (3) attachment bolt (4) is seated. NEWLY INSTALLED FRONT FENDER STAY NOTE: CAUTION: If the bolt (4) contact area (3) is painted when the front fender stay (2) is newly replaced, it could cause a malfunction in the PCM. Before painting a newly replaced part, protect the bolt (4) contact area (3) with masking tape (5) as shown in the figure.

  Associated Products (11)

  2026 Mazda CX-502025 Mazda CX-52025 Mazda CX-502024 Mazda CX-52024 Mazda CX-502023 Mazda CX-52023 Mazda CX-502022 Mazda CX-52021 Mazda CX-32021 Mazda CX-52021 Mazda Mazda6
  Associated Documents

  • DownloadMC-11032100-0001.pdf↗
• March 11, 2026•Document ID: 11030636

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  SA-014-26

  Date Added:

  April 2, 2026

  Manufacturer:

  MAZDA

  Summary

  This Service Alert supersedes the previously issued SA(s) and TSB(s) listed below: The changes are noted in Red. SA-035/24 05/31/24 DESCRIPTION There is a concern that some water pumps are being replaced that are not faulty, due to signs of a very small coolant leak from the bleed hole. This Service Alert is to inform you about the water pump sealing mechanism and the criteria if replacement is necessary or not. A mechanical seal (A) is used for the water pump. This mechanical seal can seal coolant (B) by sliding a mating ring (C) against a seal ring (D). When the sliding surface temperature of the mechanical seal is more than 248 °F (120 °C) while driving, a small amount of steam (E) is leaked and bleeds through the bleeding hole (F). After drying, the steam leaves a green coolant deposit near the water pump bleed hole (F). This is a normal condition and does not require water pump replacement. The water pump should only be replaced if there is an accumulation of crystallized coolant near the bleed hole. When you encounter a water pump with coolant seepage marks, decide to replace it or not based on the following criteria using sample photos. NOTE: During the initial period of use*, the sliding surfaces of the seals may not yet be fully settled, which can temporarily increase the amount of leakage. Continued use will allow the surfaces to settle, reducing the leakage. Replacing parts that are already settled with new ones will increase the leakage again until the new parts become conditioned. Therefore, replacement should be avoided in this initial period of use. *As a guideline, this applies to vehicles with less than 1,860 miles (3000 km) of mileage.

  Associated Products (36)

  2026 Mazda CX-302026 Mazda CX-52026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda CX-902024 Mazda Mazda32024 Mazda MX-52023 Mazda CX-302023 Mazda CX-5+ 16 more
  Associated Documents

  • DownloadMC-11030636-0001.pdf↗
• March 4, 2026•Document ID: 11030631

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER; ELECTRICAL SYSTEM

  Mfr Comm. #:

  SA-012-26a

  Date Added:

  April 2, 2026

  Manufacturer:

  MAZDA

  Summary

  This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-012/26 02/26/2026 DESCRIPTION Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. Connected Vehicle Remote functions may fail. The following DTC's may be stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL UNIT/TELEMATICS COMMUNICATION UNIT REPAIR PROCEDURE 1. Verify the concern. 2. Check if any of the following DTCs are stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL UNIT/TELEMATICS COMMUNICATION UNIT Are the following DTCs stored? YES: Proceed to next step. NO: This service information does not apply. Continue troubleshooting using MGSS. 3. Check for electrical devices in the vehicle such as a device connected to USB hub, Dash Cam, Insurance Device, FasTrak........ect. Are there any customer electrical devices in the vehicle? YES: Document customer device used, then go to the next step. NO: Go to the next step. 4. Check for a Navi SD Card. Is the vehicle equipped with a Navi SD Card? YES: Replace the Navi SD Card. NO: Go to next step. 5. Complete the Dealer Connected Vehicle Questionnaire. 6. Collect CMU log data. Go to Infotainment/TCU --> Collecting CMU Log Data --> CMU Log Data Retrieval Instructions 7. Collect TCU log data. Go to Infotainment/TCU --> TCU Log Data Retrieval Instructions --> CMU Log Data Retrieval Instructions 8. Contact Hotline for additional assistance. 9. Release the vehicle to the customer. NOTE: This concern is currently under investigation

  Associated Products (13)

  2026 Mazda CX-302026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32025 Mazda CX-302025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32024 Mazda CX-302024 Mazda CX-902024 Mazda Mazda3
  Associated Documents

  • DownloadMC-11030631-0001.pdf↗
• February 27, 2026•Document ID: 11029531

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER; ELECTRICAL SYSTEM

  Mfr Comm. #:

  SA-012-26

  Date Added:

  March 4, 2026

  Manufacturer:

  MAZDA

  Summary

  This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-060/25 12/16/25 Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. Additional symptoms that may occur: Connected Vehicle One Time Passcode (OTP) may fail. Connected Vehicle Remote functions may fail. The following DTC's may be stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL UNIT/TELEMATICS COMMUNICATION UNIT

  Associated Products (13)

  2026 Mazda CX-302026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32025 Mazda CX-302025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32024 Mazda CX-302024 Mazda CX-902024 Mazda Mazda3
  Associated Documents

  • DownloadMC-11029531-0001.pdf↗
• February 21, 2026•Document ID: 11029492

  Service Bulletin/Repair Instructions
  STRUCTURE:BODY

  Mfr Comm. #:

  SA-008-26

  Date Added:

  March 4, 2026

  Manufacturer:

  MAZDA

  Summary

  This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-041/25 10/31/25 and 09/10/25 During PDI, an indentation in the rear bumper may be noticed, or in some cases, the customer may return after delivery to report the indentation. Follow the steps below to repair the concern.

  Associated Products (4)

  2026 Mazda CX-502025 Mazda CX-502024 Mazda CX-502023 Mazda CX-50
  Associated Documents

  • DownloadMC-11029492-0001.pdf↗
• February 11, 2026•Document ID: 11029226

  Service Bulletin/Repair Instructions
  SERVICE BRAKES

  Mfr Comm. #:

  04-001-26

  Date Added:

  March 3, 2026

  Manufacturer:

  MAZDA

  Summary

  This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 04-001/25 02/06/25 Some vehicles may experience the front inner brake pads wear out faster than the outside. This accelerated pad wear may be caused by dirt and sand easily adhering to the inner friction surface of the disc while driving. To eliminate this concern, the shape of the dust cover and the front brake pad chamfer shape have been changed.

  Associated Products (3)

  2025 Mazda CX-502024 Mazda CX-502023 Mazda CX-50
  Associated Documents

  • DownloadMC-11029226-0001.pdf↗
• January 31, 2026•Document ID: 11028102

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  01-003-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some vehicles may exhibit a check engine light ON with DTC P20F8:00 stored. P20F8:00 - Swirl control circuit range/performance problem. • The DTC is caused by overheating of the Swirl Control Valve (SCV) motor which leads to duty limitation, causing poor opening􀀀angle response and resulting in stuck judgment. To eliminate this concern, the PCM control software has been modified.

  Associated Products (9)

  2025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda Mazda32024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda Mazda32023 Mazda Mazda3
  Associated Documents

  • DownloadMC-11028102-0001.pdf↗
• January 27, 2026•Document ID: 11028100

  Service Bulletin/Repair Instructions
  STRUCTURE:BODY; ELECTRICAL SYSTEM

  Mfr Comm. #:

  09-006-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some customers may report hearing an unusual noise coming from the power liftgate (PLG) when it is unlatching to open or latching closed. This is caused by an internal fault in the liftgate latch and/or loose bolts holding the latch to the liftgate. To eliminate this concern, the internal structure of the latch and surface treatment of the bolts have been modified.

  Associated Products (4)

  2023 Mazda CX-302023 Mazda CX-502022 Mazda CX-302021 Mazda CX-30
  Associated Documents

  • DownloadMC-11028100-0001.pdf↗
• January 26, 2026•Document ID: 11028133

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  SA-005-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  There are currently 2 methods for cutting a new auxiliary key blank. A. Auxiliary Key Trace Cut Method • B. Auxiliary Key Code Cut Method 2019 and newer models require a 10-digit key code to accurately cut keys • 5-digit codes CANNOT be provided for 2019 and newer vehicles (the traditional 5-digit code from the key tag or driver's door lock cylinder is not sufficient and will not be issued for key cutting on these models). • Only Mazda-approved key cutting machines can process these 10-digit codes. • Many older key machines do not support 10-digit codes and cannot be updated to do so. In these cases, dealers will need to purchase one of the newer Mazda-approved key cutting machines capable of handling this requirement. • For a list of current Mazda-approved machines and purchasing options, refer to the Mazda Dealer Equipment Program or view the current Mazda approved key machines below.

  Associated Products (40)

  2026 Mazda CX-302026 Mazda CX-52026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32026 Mazda MX-52025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32025 Mazda MX-52024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda CX-902024 Mazda Mazda32024 Mazda MX-5+ 20 more
  Associated Documents

  • DownloadMC-11028133-0001.pdf↗
• January 20, 2026•Document ID: 11028130

  Service Bulletin/Repair Instructions
  STRUCTURE:BODY; UNKNOWN OR OTHER

  Mfr Comm. #:

  SA-004-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some customers may complain that a door beltline molding is loose, fell off, or is missing.

  Associated Products (4)

  2026 Mazda CX-502025 Mazda CX-502024 Mazda CX-502023 Mazda CX-50
  Associated Documents

  • DownloadMC-11028130-0001.pdf↗
• January 13, 2026•Document ID: 11028098

  Service Bulletin/Repair Instructions
  SEATS

  Mfr Comm. #:

  09-004-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some vehicles may exhibit a crack in the door side of the front seat cushion trim. Cracks develop along the areas where wrinkles form when weight is applied to the seat. When exiting the vehicle, the door-side surface of the cushion trim may be folded and compressed. When entering the vehicle, the surface of the cushion bolster may be rubbed and stretched. Repeated occurrences of these conditions may result in a crack forming in the surface of the seat cushion trim. To eliminate this concern, the material of the door-side surface of the front seat cushion trim has been modified to improve tear strength and scratch resistance.

  Associated Products (4)

  2026 Mazda CX-502025 Mazda CX-502024 Mazda CX-502023 Mazda CX-50
  Associated Documents

  • DownloadMC-11028098-0001.pdf↗
• January 12, 2026•Document ID: 11028124

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  16-002-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7230C1A-NA02_10014. NOTE: If current version is not 7230C1A-NA02_***** , this TSB is not applicable. (Ver. 7230C1A-NA02_10014) fixes these software errors (bugs): The infotainment screen may turn black when SIRIUSXM® Satellite Radio is selected. However, the camera images on the center display are not affected, and the back camera is usable. • Air conditioning settings cannot be controlled via Alexa without a CV contract. • The banner display for battery level notifications of Bluetooth®-connected devices has been modified. • Alexa may be signed out when the driver is uninstalled after Alexa has been set up. • Backup and restore may fail in the factory service diagnostics. • The Wi-Fi client connection screen may not disappear even after several seconds. • The system may freeze on the disclaimer screen when the engine is started normally after using the remote engine starter. However, the camera images on the center display are not affected, and the back camera is usable. • When attempting to connect Android Auto™, only Bluetooth® connection is established. • (Ver. 7230C1A-NA02_10012) fixes these software errors (bugs): The smartphone may not be charged when a smartphone is connected to a USB port while connected to wireless CarPlay. • Apple CarPlay® wireless connection may fail. • The Wi-Fi client menu is unavailable when the in-vehicle communication unit has no signal.

  Associated Products (3)

  2025 Mazda CX-502024 Mazda CX-502023 Mazda CX-50
  Associated Documents

  • DownloadMC-11028124-0001.pdf↗
• January 8, 2026•Document ID: 11028123

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  16-001-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some vehicles may experience the symptoms mentioned below, which can be fixed with the latest software update (Version 7230C1A-NA01_10014 or 7230C2A-NA01_10014). NOTE: If current version is not 7230C1A-NA01_***** or 7230C2A-NA01_*****, this TSB is not applicable. (Ver. 7230C2A-NA01_10014) fixes these software errors (bugs): The banner display for battery level notifications of Bluetooth®-connected devices has been modified. • When the engine is started normally after using the remote engine starter, the system may freeze on the disclaimer screen. However, the camera images on the center display are not affected, and the back camera is usable. • When attempting to connect Android AutoTM, only Bluetooth® connection is established. • The infotainment screen may turn black when SIRIUSXM® Satellite Radio is selected. However, the camera images on the center display are not affected, and the back camera is usable. • (Ver. 7230C2A-NA01_10012) fixes these software errors (bugs): Apple CarPlay® wireless connection may fail. • The smartphone may not be charged when a smartphone is connected to a USB port while connected to Apple CarPlay®. • Although the SD card is removed, a navigation guidance may be displayed in Active Driving Display and/or the center display. • Pressing the commander may sometimes fail to display the menu after deleting multiple destination.

  Associated Products (3)

  2025 Mazda CX-502024 Mazda CX-502023 Mazda CX-50
  Associated Documents

  • DownloadMC-11028123-0001.pdf↗
• January 7, 2026•Document ID: 11028095

  Service Bulletin/Repair Instructions
  SEATS

  Mfr Comm. #:

  09-001-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  There are wrinkles on the leather seat cushion and/or seat back surface at PDI, when new vehicle is delivered, or when new upholstery is installed under Warranty repair. NOTE: This repair is not a permanent fix, it is meant to make new seats look their best when the vehicle is first presented to the customer. Wrinkles may not be completely removed after the repair is completed. Leather is a natural material and may develop some wrinkles due to aging and wear during normal usage.

  Associated Products (33)

  2026 Mazda CX-302026 Mazda CX-52026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32026 Mazda MX-52025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32025 Mazda MX-52024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda CX-902024 Mazda Mazda32024 Mazda MX-5+ 13 more
  Associated Documents

  • DownloadMC-11028095-0001.pdf↗
• January 6, 2026•Document ID: 11028128

  Service Bulletin/Repair Instructions
  WHEELS

  Mfr Comm. #:

  SA-002-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some customers may complain that the tire sidewalls are distorted or "damaged". Sidewall waviness/indentations/undulations are common on radial tires and are more noticeable on tires with taller sidewalls. The higher the tire pressure, the more noticeable the effect will be. Be sure to set the tire pressures at the recommended tire pressure on the vehicle tire label. Sidewall indentations are a cosmetic condition that does not affect the performance of the tires.

  Associated Products (15)

  2026 Mazda CX-302026 Mazda CX-52026 Mazda CX-502026 Mazda Mazda32026 Mazda MX-52025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda Mazda32025 Mazda MX-52024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda Mazda32024 Mazda MX-5
  Associated Documents

  • DownloadMC-11028128-0001.pdf↗
• January 5, 2026•Document ID: 11028127

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  SA-001-26

  Date Added:

  February 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some customers may report an odor or water in the HVAC system and upon inspection, the cabin air filter may be found to be wet.

  Associated Products (40)

  2026 Mazda CX-302026 Mazda CX-52026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32026 Mazda MX-52025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32025 Mazda MX-52024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda CX-902024 Mazda Mazda32024 Mazda MX-5+ 20 more
  Associated Documents

  • DownloadMC-11028127-0001.pdf↗
• December 17, 2025•Document ID: 11026917

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM

  Mfr Comm. #:

  SA-061-25

  Date Added:

  January 4, 2026

  Manufacturer:

  MAZDA

  Summary

  If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices.

  Associated Products (40)

  2026 Mazda CX-302026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32026 Mazda MX-52025 Mazda CX-302025 Mazda CX-52025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda32025 Mazda MX-52024 Mazda CX-302024 Mazda CX-52024 Mazda CX-502024 Mazda CX-902024 Mazda Mazda32024 Mazda MX-52023 Mazda CX-30+ 20 more
  Associated Documents

  • DownloadMC-11026917-0001.pdf↗
• December 17, 2025•Document ID: 11026913

  Service Bulletin/Repair Instructions
  ELECTRICAL SYSTEM; UNKNOWN OR OTHER

  Mfr Comm. #:

  SA-060-25

  Date Added:

  January 3, 2026

  Manufacturer:

  MAZDA

  Summary

  Some customers may experience a message "TCU Malfunction. Have the Vehicle Inspected" in the instrument cluster. The following DTC's may be stored: B1252:87-8B:TCU - COMMUNICATION ERROR WITH CONNECTIVITY MASTER UNIT (CMU) • U0198:00-03:CMU - COMMUNICATION ERROR WITH EMERGENCY CALL UNIT/TELEMATICS COMMUNICATION UNIT

  Associated Products (10)

  2026 Mazda CX-302026 Mazda CX-502026 Mazda CX-702026 Mazda CX-902026 Mazda Mazda32025 Mazda CX-302025 Mazda CX-502025 Mazda CX-702025 Mazda CX-902025 Mazda Mazda3
  Associated Documents

  • DownloadMC-11026913-0001.pdf↗