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.
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By component
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Only bulletins with component: Electrical system are shown. Show all
| PIT5743A | 2021-09-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates diagnostic tips when trying to root cause a SES MIL with DTC's B2B0D and B2B0E. Main cause is aftermarket electrical devices spliced into the ignition main fuses. |
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| PIP5806C | 2021-09-13. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This preliminary information bulletin instructs to technicians to check the trigger wheel for interfering with the timing chain, and adding a shim to the camshaft position sensor. |
| PIC6438A | 2021-09-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a condition where the Video Processing Control Module is not able to be programmed to the vehicle. This PI offeres a couple workarounds while Engineering evaluates the concern. |
| PIC6438 | 2021-09-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a condition where the Video Processing Control Module is not able to be programmed to the vehicle. This PI offeres a couple workarounds while Engineering evaluates the concern. |
| PIT5750A | 2021-09-13. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This Preliminary information communicates an issue with the battery goes dead and provides diagnostics tips on inspecting the LIN bus. |
| PIT5509H | 2021-09-13. Service bulletin. AIR BAGS; TRAILER HITCHES; ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System? message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trailer brake system that is being used. The Chassis Control Module can be sensitive to a variety of trailer wiring issues. The technician will need to make a trailer tester using Electric Trailer Brake Magnets and 7-way trailer connector to determine if it is a vehicle or trailer issue. If the concern is not duplicated with the tester installed, the vehicle is operating correctly and the focus should be on the trailer wiring or 7 way connector. |
| PIT5698B | 2021-09-13. Service bulletin. ELECTRICAL SYSTEM:ADAS:BLINDSPOT:SENSORS. This Preliminary information communicates additional information on how a LIN bus operates and diagnostic tips when working on a LIN bus. |
| PIT5509H | 2021-09-13. Service bulletin. ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System? message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trailer brake system that is being used. The Chassis Control Module can be sensitive to a variety of trailer wiring issues. The technician will need to make a trailer tester using Electric Trailer Brake Magnets and 7-way trailer connector to determine if it is a vehicle or trailer issue. If the concern is not duplicated with the tester installed, the vehicle is operating correctly and the focus should be on the trailer wiring or 7 way connector. |
| N212333800 | 2021-08-09. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ELECTRICAL SYSTEM. Emission Recall. General Motors has decided to conduct a voluntary emissions recall involving certain vehicles equipped with a performance air intake system (LPO RVK or 5W7). The Engine Control Module (ECM) may not have been programmed with the calibrations appropriate for the performance air intake system installed on the engine in these vehicles. Dealers will reprogram the ECM. |
| PIE0645 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT; POWER TRAIN. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Service Engine Soon Lamp Illuminated on Driver Information Center (DIC), Transmission Not Shifting Properly and/or Slipping, DTC P0796, P2714 Set. |
| PIE0644A | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to their vehicle having sudden loss of propulsion. |
| PIE0644 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to their vehicle having sudden loss of propulsion. |
| PIE0642A | 2021-08-09. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards the Service Engine Soon (SES) lamp illuminated and/or Service Emission System Message on the Driver Information Center (DIC). |
| PIE0609A | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR:INTEGRATED STARTER(OTHER THAN PROPULSION); EQUIPMENT; ELECTRICAL SYSTEM; ENGINE. 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 heard from the engine compartment, loss of charging and/or reduced alternator output. |
| 21NA149 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:WIRING; ENGINE. This technical bulletin provides repair information to correct a customer concern of Engine Wire Harness Chafing. |
| 21NA145 | 2021-08-09. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. This service bulletin provides U157 software update information to correct customer concerns of radio Software related issues. |
| 21NA139 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). This service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set. |
| 21NA136 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; BACK OVER PREVENTION. This technical bulletin provides repair information to correct a customer concern of Crooked Rear View Camera Guideline Image on Radio Display. |
| PIE0642 | 2021-08-09. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards the Service Engine Soon (SES) lamp illuminated and/or Service Emission System Message on the Driver Information Center (DIC). |
| PIE0610B | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Loss of Power, Instrument Panel Cluster (IPC) Gauges are Inoperative and/or Fluctuate, Multiple Warning Lights on DIC. |
| PIE0602B | 2021-08-09. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service Engine Soon Lamp illuminated on Driver Information Center. |
| 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. |
| 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. |
| 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. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.