Service bulletins for the 2020 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.
1990 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| 100089006H | 2021-08-09. Service bulletin. EQUIPMENT. This service bulletin provides information for dealers on how to submit a product information report (PIR) (Canada Only). |
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| 070089037Q | 2021-08-09. Service bulletin. EQUIPMENT. This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance programs. |
| 070089037P | 2021-08-09. Service bulletin. EQUIPMENT. This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance programs. |
| 21NA124 | 2021-07-19. Service bulletin. FUEL SYSTEM, GASOLINE:STORAGE:EVAPORATIVE EMISSIONS:CANISTER. This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set. |
| 21NA121 | 2021-07-19. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides a procedure to inspect fuses F51DR and/or F52DR in the X51R right instrument panel fuse block when they should not be installed. |
| 21NA120 | 2021-07-19. Service bulletin. POWER TRAIN. This technical bulletin provides the tech with a procedure to check if the transmission is the cause of the concern by checking the data. |
| 21NA113 | 2021-07-19. Service bulletin. POWER TRAIN. This technical bulletin provides a procedure to perform a learn procedure for the turbo actuator. |
| 21NA110 | 2021-07-19. Service bulletin. EQUIPMENT. This informational bulletin provides information for dealers/technicians on Information on GM Accessories - Instructions on Claim Submission on Dealer-Replaced Tonneau Covers During Warranty Period. |
| 21NA109 | 2021-07-19. Service bulletin. ENGINE. This service bulletin provides diagnostic information for a customer concern of engine vibration. |
| 21NA101 | 2021-07-19. Service bulletin. STRUCTURE:BODY:DOOR; STRUCTURE. This service bulletin provides a procedure to replace both front door seals to correct a customer concern of Howl, Hoot, or Whistle Type Noise when Driving in Crosswinds. |
| 21NA091 | 2021-07-19. Service bulletin. BACK OVER PREVENTION. This service bulletin provides information for customers/dealers/technicians on Normal Rearview Camera Display Operation - Flashing Diamond - Spot - or UFO like image on Rear View Camera Display. |
| 21NA025 | 2021-07-19. Service bulletin. ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE. This technical bulletin provides a procedure to replace the Fuel Power Module if found the cause of the customers concern. |
| 20NA218 | 2021-07-19. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6. |
| 20NA159 | 2021-07-19. Service bulletin. EQUIPMENT. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only). |
| 19NA129 | 2021-07-19. Service bulletin. SUSPENSION. This technical bulletin provides repair information to correct a customer concern of a squeak and/or clunking noise coming from the rear of the vehicle. |
| 19NA076 | 2021-07-19. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This service bulletin provides repair information to correct a customer concern of Blue or Black Screen and Service Rear Vision System Message on Radio Display Shifting into Reverse. |
| 19NA044 | 2021-07-19. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This service bulletin provides information on the cold start control system in DI engines to reduce cold start emissions and improve fuel economy. |
| 18NA361 | 2021-07-19. Service bulletin. FUEL SYSTEM, DIESEL; ELECTRICAL SYSTEM. This technical bulletin provides a procedure to flush the cooler lines to validate if there is excessive debris in the fuel system caused by a failed part. |
| 18NA306 | 2021-07-19. Service bulletin. EQUIPMENT. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA). |
| 18NA279 | 2021-07-19. Service bulletin. LATCHES/LOCKS/LINKAGES; ELECTRICAL SYSTEM. This service bulletin provides information for dealers/technicians on the process to disable and enable passive unlocking. |
| 21NA124 | 2021-07-06. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set. |
| 21NA121 | 2021-07-06. Service bulletin. ELECTRICAL SYSTEM. This technical bulletin provides a procedure to inspect fuses F51DR and/or F52DR in the X51R right instrument panel fuse block when they should not be installed. |
| 21NA120 | 2021-07-06. Service bulletin. POWER TRAIN. This technical bulletin provides the tech with a procedure to check if the transmission is the cause of the concern by checking the data. |
| 21NA113 | 2021-07-06. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides a procedure to perform a learn procedure for the turbo actuator. |
| 21NA110 | 2021-07-06. Service bulletin. EQUIPMENT. This informational bulletin provides information for dealers/technicians on Information on GM Accessories - Instructions on Claim Submission on Dealer-Replaced Tonneau Covers During Warranty Period. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.