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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

Bulletins, newest first
19NA2572021-02-22. Service bulletin. STRUCTURE. This technical bulletin provides repair information to correct a customer concern of the pickup box being out of alignment.
19NA2182021-02-22. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides a service procedure to correct a condition of Ticking Noise from the Engine.
19NA1362021-02-22. Service bulletin. ENGINE AND ENGINE COOLING. This service bulletin provides a diagnostic procedure to aid in correcting a customer concern of a Howling, Whining/Whirring Noise, Shudder/Vibration and/or Grinding Noise While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode.
18NA3062021-02-22. Service bulletin. EQUIPMENT. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA).
17NA1662021-02-22. Service bulletin. ENGINE AND ENGINE COOLING. This technical bulletin provides a procedure to measure vibration and install engine mounts to correct a Rough Idle in Drive concern.
16NA0192021-02-22. Service bulletin. POWER TRAIN. This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
N2023161602021-02-22. Service bulletin. SEAT BELTS. Service Update - Certain 2020 model year Chevrolet Silverado 1500/2500 and GMC Sierra 1500/2500 vehicles may have a condition where the driver side front outboard seat belt may not retract due to a broken rewind spring. If the seat belt is loose, the effectiveness of the restraints may be reduced. The retractor will still pretension and lock during a crash. Replace the seat belt retractor.
N2023153802021-02-22. Service bulletin. STEERING. Service Update. A small number of vehicles may have been built with a cracked steering gear ballnut which could result in noise and reduction of steering performance. Dealers are to replace the steering gear.
N202319660 012021-02-22. Service bulletin. ENGINE AND ENGINE COOLING. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin.
N2023161602021-02-16. Service bulletin. SEAT BELTS; AIR BAGS. Service Update - Certain 2020 model year Chevrolet Silverado 1500/2500 and GMC Sierra 1500/2500 vehicles may have a condition where the driver side front outboard seat belt may not retract due to a broken rewind spring. If the seat belt is loose, the effectiveness of the restraints may be reduced. The retractor will still pretension and lock during a crash. Replace the seat belt retractor.
N2023153802021-02-16. Service bulletin. BACK OVER PREVENTION; STEERING. Service Update. A small number of vehicles may have been built with a cracked steering gear ballnut which could result in noise and reduction of steering performance. Dealers are to replace the steering gear.
N202319660 012021-02-16. Service bulletin. ENGINE; EQUIPMENT. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin.
PIT5713A2021-02-16. Service bulletin. LANE DEPARTURE. This Preliminary information communicates an issue with the engine wiring harness shorting at the left front cylinder head causing any of the following issues: - IPC gauges sweeping while driving - Several IPC warning messages and MIL displayed - Any combination of the following DTC's: U0073 U0100 U0101 U0121 U0128 U0129 U0131 U0140 U0146 U0422 U2413 P0107 P0117 P0119 P0641 C2A07
PIT5799A2021-02-16. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates a cocnern where a flashing spot can intermittently show up on the radio display while in reverse. The PI advises that engineering is investigating the concern.
PIP57702021-02-16. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. This Preliminary information communicates to the dealer technician to reprogram the transmission control module after any 10L1000 transmission repair.
PIP57712021-02-16. Service bulletin. STRUCTURE; POWER TRAIN. This Preliminary information communicates to the dealer technician to replace the valve body on the 8L90 transmission setting DTC P0796 if no debris is found in the transmission fluid pan. If debris is found in the transmission fluid pan the technician is advised to repair the transmission as need and replace the valve body.
PIT5751C2021-02-16. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates and issue with the SES MIL on setting DTC's P0201/P0202/P0203/P0204/P0205/P0206/P0216 and instructing dealership to inspect the engine wiring harness for damage.
PIT5479D2021-02-16. Service bulletin. ENGINE AND ENGINE COOLING. 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 installation. This grease can be cleaned off and the rest of the service completed.
PIT5747A2021-02-16. Service bulletin. TRAILER HITCHES; AIR BAGS. This Preliminary information communicates to dealership how to test properly trailer light option on the truck and also provide additional information on trailer issues.
PIT5386F2021-02-16. Service bulletin. ELECTRICAL SYSTEM; BACK OVER PREVENTION. This Preliminary Information communication provides information to the technician about vehicles that are found to have a back-up alarm inoperative during the Pre-Delivery Inspection. On trucks equipped with the Back Up Alarm (RPO 8S3), the alarm will be intentionally left disconnected from the assembly plant. Technician will reroute the harness and plug it in.
PIP5764A2021-02-16. Service bulletin. EQUIPMENT. This Preliminary information communicates to the technician a possible cause of a P2B60 as terminal corrosiosn and provides a correction
PIP5748D2021-02-16. Service bulletin. BACK OVER PREVENTION. This Preliminary information communicates to the technition instructions to replace the particulate matter sensor for a P1488 and to use the special labor operation for tracking purposes.
PIP57622021-02-16. Service bulletin. EQUIPMENT. This preliminary information communicates to technicians a possible valve cover causing oil consusmption and the repair.
PIT5387J2021-02-16. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; BACK OVER PREVENTION:SOFTWARE; BACK OVER PREVENTION:DISPLAY FUNCTION. This Preliminary Information communication provides information to the technician how to repair vehicles that Instrument Panel Cluster, Radio, and Heater-Vent-Air Conditioning display blanks out, Bluetooth phone or Pandora connection dropped, the radio station or volume changes when operating the snow plow. Please advise the customer that engineering is aware of this concern and working on this issue.
PIE06042021-02-01. Service bulletin. ELECTRICAL SYSTEM. GSA Example: 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 4WD message illuminated on the drivers information center (DIC).

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