GMC Sierra Service Bulletins (2021)

1,650 manufacturer communications on file.

• November 20, 2025•Document ID: 11025755

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT5214G

  Date Added:

  November 28, 2025

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit vibration conditions without utilizing the support of General Motors Technical Assistance Center. If valid vibration frequency or Road Force Variation data has been collected and a repair attempt does not correct the customer complaint, contact General Motors Technical Assistance Center for further support. For any vehicles that remains unrepaired after being at the dealer for three days or more and a related bulletin or PI is not found, contact General Motors Technical Assistance Center for further support.

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  Associated Documents

  • DownloadMC-11025755-0001.pdf↗
• November 7, 2025•Document ID: 11025462

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5865J

  Date Added:

  November 10, 2025

  Manufacturer:

  CHEVROLET

  Summary

  This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.

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  Associated Documents

  • DownloadMC-11025462-0001.pdf↗
• November 6, 2025•Document ID: 11025492

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  25-NA-339

  Date Added:

  November 12, 2025

  Manufacturer:

  CHEVROLET

  Summary

  Under Field Actions N252494000, N252494001, the service procedure includes performing a PICO test on vehicle engines within the identified suspect VIN population. If the engine passes the PICO test, the engine oil will be changed from 0W20 to Mobil 1 Supercar 0W40 dexosR. From that point forward, the engine must use 0W40 dexosR oil products for all future oil change services.

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  Associated Documents

  • DownloadMC-11025492-0001.pdf↗
• October 30, 2025•Document ID: 11024777

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5700F

  Date Added:

  November 3, 2025

  Manufacturer:

  GMC

  Summary

  This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering

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  Associated Documents

  • DownloadMC-11024777-0001.pdf↗
• October 22, 2025•Document ID: 11024703

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6132C

  Date Added:

  November 2, 2025

  Manufacturer:

  CHEVROLET

  Summary

  This Preliminary information communicates an issues with the HVAC making a hum buzz noise when the blower is set to a higher speed. Engineering is working on a new HVAC door seal material to correct the noise.

  Associated Products (40)

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  Associated Documents

  • DownloadMC-11024703-0001.pdf↗
• October 21, 2025•Document ID: 11024699

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6591C

  Date Added:

  November 2, 2025

  Manufacturer:

  CHEVROLET

  Summary

  This Preliminary information communicates to dealer to contact TAC for a specific display issue.

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  Associated Documents

  • DownloadMC-11024699-0001.pdf↗
• October 18, 2025•Document ID: 11024460

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6425B

  Date Added:

  October 24, 2025

  Manufacturer:

  GMC

  Summary

  This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC's

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  Associated Documents

  • DownloadMC-11024460-0001.pdf↗
• October 17, 2025•Document ID: 11024455

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6425A

  Date Added:

  October 24, 2025

  Manufacturer:

  BUICK

  Summary

  This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC's

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  Associated Documents

  • DownloadMC-11024455-0001.pdf↗
• October 16, 2025•Document ID: 11024458

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIC6551A

  Date Added:

  October 24, 2025

  Manufacturer:

  GMC

  Summary

  This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues

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  Associated Documents

  • DownloadMC-11024458-0001.pdf↗
• October 9, 2025•Document ID: 11024189

  Service Campaign
  POWER TRAIN

  Mfr Comm. #:

  N242454441 -03

  Date Added:

  October 9, 2025

  Manufacturer:

  CADILLAC

  Summary

  Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code. Dealers are to install a new control valve body. The repairs will be made at no charge to the customer.

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  Associated Documents

  • DownloadMC-11024189-0001.pdf↗
• October 8, 2025•Document ID: 11024446

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP6088

  Date Added:

  October 24, 2025

  Manufacturer:

  GMC

  Summary

  This PI Addresses a possible solenoid wiring fault and how to inspect the build date to identify

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  Associated Documents

  • DownloadMC-11024446-0001.pdf↗
• October 4, 2025•Document ID: 11024439

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT6440

  Date Added:

  October 24, 2025

  Manufacturer:

  CADILLAC

  Summary

  The Driver Information Center may display a message of Transport Mode On after the ignition is cycled.

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  Associated Documents

  • DownloadMC-11024439-0001.pdf↗
• September 16, 2025•Document ID: 11023152

  Service Campaign
  ENGINE

  Mfr Comm. #:

  N252508341

  Date Added:

  September 16, 2025

  Manufacturer:

  CADILLAC

  Summary

  Certain vehicles listed above, may have a condition that could cause the engine coolant control valve to fail an onboard vehicle diagnostic test. If this condition were to occur, the Malfunction Indicator Lamp (Check Engine Light) will illuminate, and a diagnostic trouble code will set. Additionally in some cases, the engine cooling fans may run after the engine is switched off. Dealers are to replace the engine coolant control valve as necessary. The repairs will be made at no charge to the customer.

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  Associated Documents

  • DownloadMC-11023152-0001.pdf↗
• September 9, 2025•Document ID: 11023157

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIT5479H

  Date Added:

  September 17, 2025

  Manufacturer:

  CADILLAC

  Summary

  This Preliminary Information communication provides information to the technician about fluid leaking from the brake caliper piston area found during a service of the vehicle. The substance is actually excess assembly grease from the caliper boot and piston.

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  Associated Documents

  • DownloadMC-11023157-0001.pdf↗
• September 9, 2025•Document ID: 11023091

  Other
  UNKNOWN OR OTHER

  Mfr Comm. #:

  13598

  Date Added:

  September 10, 2025

  Manufacturer:

  GMC

  Summary

  New Vehicle Monitoring Programs Section in IVH

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  Associated Documents

  • DownloadMC-11023091-0001.pdf↗
• September 8, 2025•Document ID: 11023145

  Service Bulletin/Repair Instructions
  UNKNOWN OR OTHER

  Mfr Comm. #:

  PIP5865H

  Date Added:

  September 16, 2025

  Manufacturer:

  CHEVROLET

  Summary

  This Preliminary information communicates the possibility of DTC P30BF failing on low mile vehicles due to the possibility of the cylinder 1/2 sliding barrel binding on intake camshaft.

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  Associated Documents

  • DownloadMC-11023145-0001.pdf↗
• September 6, 2025•Document ID: 11024378

  Service Bulletin/Repair Instructions
  STEERING; SERVICE BRAKES; ELECTRICAL SYSTEM

  Mfr Comm. #:

  23-NA-201

  Date Added:

  October 21, 2025

  Manufacturer:

  CHEVROLET

  Summary

  This service bulletin advises the technician of a possible loose ground that may be causing customer concerns of Loss of Steering Assist and/or Loss of Brake Assist and Malfunction Indicator Lamp (MIL) Illuminated.

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  Associated Documents

  • DownloadMC-11024378-0001.pdf↗
• September 6, 2025•Document ID: 11024332

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  24-NA-241

  Date Added:

  October 16, 2025

  Manufacturer:

  GMC

  Summary

  This informational bulletin advises the technician of a part number change for long block engines used in the trucks noted.

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  Associated Documents

  • DownloadMC-11024332-0001.pdf↗
• September 6, 2025•Document ID: 11024330

  Service Bulletin/Repair Instructions
  ENGINE

  Mfr Comm. #:

  22-NA-080

  Date Added:

  October 16, 2025

  Manufacturer:

  CHEVROLET

  Summary

  This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder.

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  Associated Documents

  • DownloadMC-11024330-0001.pdf↗
• September 5, 2025•Document ID: 11022828

  Service Campaign
  UNKNOWN OR OTHER

  Mfr Comm. #:

  N252510321-02

  Date Added:

  September 5, 2025

  Manufacturer:

  CHEVROLET

  Summary

  Certain vehicles will receive a software update to add to the existing Check Engine Light a Driver Information Center (DIC) warning message if DTC P0016 sets. Dealers will reprogram the Engine Control Module (ECM). Owners who have accepted applicable terms and conditions will have the opportunity to accept these software changes using wireless over-the-air (OTA) technology without having to bring their vehicle to a dealership. Alternatively, owners may have their vehicle serviced at a GM dealer to receive these software updates.

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  Associated Documents

  • DownloadMC-11022828-0001.pdf↗