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Service bulletins for the 2021 GMC Sierra

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1649 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Bulletins, newest first
PIT5551F2020-11-16. Service bulletin. FORWARD COLLISION AVOIDANCE. This Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. This is normal when the FAB has been set to "Alert".
PIP5733E2020-11-16. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
PIE05842020-10-26. Service bulletin. EXTERIOR LIGHTING; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This engineering information (EI) is requesting information from technicians to provided the engineers listed in regards to No Trailer Lights, No Brake Lights and/or Trailer Tow Receptacle is Loose.
PIE0574A2020-10-26. Service bulletin. FUEL SYSTEM, OTHER; ENGINE. This engineering informational bulletin is requesting information from technicians to inspect for engine oil leak and contact the engineer listed.
110089005P2020-10-26. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only).
20NA1872020-10-26. Service bulletin. POWER TRAIN. This technical bulletin provides a repair procedure to correct a customer concern of Delayed and/or Harsh Engagement of Transmission Shift After Vehicle Sitting with Engine Off.
20NA1572020-10-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
18NA3062020-10-26. Service bulletin. EQUIPMENT; STRUCTURE:BODY. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA) (US dealers only).
16NA0192020-10-26. Service bulletin. POWER TRAIN. This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
PIP57532020-10-19. Service bulletin. WHEELS; PARKING BRAKE. PIP5753 created to advise the technician to inspect for loose bolts on the turbocharger if there is a performance issue and code set.
PIP5733D2020-10-19. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
PIT5709A2020-10-19. Service bulletin. STRUCTURE. This Preliminary information communicates the need for proper documentation when submitting a Field Product Report on paint issues with the new HD Silverado and Sierra.
PIE05802020-10-05. Service bulletin. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a noise coming from the window regulator area.
20NA1592020-09-28. Service bulletin. TIRES. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
20NA1572020-09-28. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
16NA3612020-09-28. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin explains possible normal condition of a flare from 1st to 2nd, even if the trans had been repaired for the flare and its still noticed.
PIP5733C2020-09-14. Service bulletin. ENGINE. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
PIP5733B2020-09-14. Service bulletin. EQUIPMENT; ENGINE. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
PIE05742020-09-08. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE. This engineering informational bulletin is requesting information from technicians to inspect for engine oil leak and contact the engineer listed.
PIP57452020-08-10. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates to technicians a possible cause and correction for a P026A
PIP5733A2020-08-10. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
PIP5684B2020-08-10. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING:COOLING SYSTEM; EQUIPMENT. This Preliminary information communicates the use of air leak diagnostic test tool CH-52250 in addition to the information found in the service manual.
090089002R2020-06-01. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This informational bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before sold (prepping) to the customer.
20NA0832020-05-26. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This technical bulletin provides a procedure to check the oil level for correct reading and oil pressure switch is in working order.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.