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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
N2424544412024-11-27. Service bulletin. POWER TRAIN. 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. This special coverage covers the condition described above for a period of 15 years or 150,000 miles (240,000km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after November 26, 2024, are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to November 26, 2024, must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below. The conditional right to reimbursement is provided by GM solely in the interest of customer satisfaction and is personal to Customers. Customers may not assign and GM does not consent to any assignment of any Customer’s right to submit reimbursement claims, or to receive reimbursement, or any other rights granted by this Special Coverage to any third party, including but not limited to service contract providers, and this Special Coverage is not intended to and does not confer any third party beneficiary, subrogation or contribution rights, or any other rights to reimbursement, against GM, whether in law, equity or otherwise, on any third parties. Dealers are to install a new control valve body. The repairs will be made at no charge to the customer.
24-NA-1962024-11-19. Service bulletin. ENGINE. This informational bulletin advises the tech and the customer of a normal DEF operation while under high load conditions and when the time is right to fill the DEF at that time frame.
24-NA-0402024-11-16. Service bulletin. UNKNOWN OR OTHER. This service bulletin provides information on All hazmat parts being returned to the Warranty Parts Center (WPC) must be shipped using Central Transport. Hazardous materials should never be sent by air transportation to the WPC.
23-NA-0732024-11-16. Service bulletin. ENGINE. This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
19-NA-2552024-11-15. Service bulletin. STRUCTURE:BODY. This service bulletin provides frame coating repair information to correct a customer concern of wax coating on frame peeling, metal shows corrosion/rusting (U.S. and Canada Only).
12-08-51-002Q2024-11-14. Service bulletin. STRUCTURE:BODY. This informational bulletin provides technicians and dealership personnel with spray-in bed liner general information and repair procedures.
10-00-89-009F2024-11-14. Service bulletin. UNKNOWN OR OTHER. This service bulletin provides information on key code security rules and information on GM keycode look-up applications (U.S).
03-06-01-023H2024-11-14. Service bulletin. ENGINE. This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
23-NA-1542024-11-13. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information on Warranty Administration – Required Operating Procedures - 8 Points (U.S. Only).
22-NA-2442024-11-13. Service bulletin. UNKNOWN OR OTHER; STRUCTURE:BODY. This warranty administration service bulletin provides information about GM Accessories - Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.
07-00-89-037T2024-11-13. Service bulletin. UNKNOWN OR OTHER. This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance programs.
01-06-01-011Q2024-11-13. Service bulletin. ENGINE. This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
99-00-89-019Z2024-11-13. Service bulletin. UNKNOWN OR OTHER. This Warranty Administration bulletin provides information on the Global Warranty Management (GWM) Warranty Parts Center (WPC) Parts Return Program.
20-NA-1322024-11-09. Service bulletin. ELECTRICAL SYSTEM. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.
23-NA-2192024-11-05. Service bulletin. UNKNOWN OR OTHER; STRUCTURE:BODY. This service bulletin provides information on Concerns or Questions Regarding Installation of Dealer Installed Accessories.
23-NA-0642024-11-05. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides information on the Transport Mode Feature, also known as Logistics mode, which is used to increase the 12V Battery stand time of the vehicle during transit and or long period of stand time at the dealerships.
20-NA-1382024-11-05. Service bulletin. POWER TRAIN; ENGINE. This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and information on Submission of Warranty Transaction in Global Warranty Management.
04-06-04-051J2024-10-31. Service bulletin. ENGINE. This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
04-06-04-051J2024-10-31. Service bulletin. ENGINE. This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
PIE08042024-10-31. Service bulletin. ENGINE. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards on hearing one or more of the following noises coming from the front of the vehicle during a cold start and/or while in operation.
21-NA-2752024-10-30. Service bulletin. WHEELS; SERVICE BRAKES; POWER TRAIN. This service bulletin provides repair information to correct customer concerns of Rear Wheel Lock Up, ABS Event, Loud Bang and a Flashing “D” on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.
17-NA-3022024-10-29. Service bulletin. FUEL/PROPULSION SYSTEM. This informational bulletin provides information on availability for a locking gas cap for trucks are operated in high amount of dirt or dust which can migrate to the filler cap area.
24-NA-1972024-10-29. Service bulletin. FUEL/PROPULSION SYSTEM; ENGINE. This technical bulletin provides a procedure to correct the condition of Malfunction Indicator Lamp Illuminated with DTCs P2463 P2459 P11FB P11D3.
PIT5698E2024-10-25. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates additional information on how a LIN bus operates and diagnostic tips when working on a LIN bus.
PIP4723J2024-10-25. Service bulletin. ELECTRICAL SYSTEM. This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8 starting/charging tester and Vehicle Data Recorder tools, giving website address and step by step instructions to complete the update.

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