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Service bulletins for the 2021 GMC Acadia

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.

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

By type

By component

By trouble code

By topic

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
23-NA-1952023-11-21. Service bulletin. POWER TRAIN. This technical bulletin provides repair information to correct a customer concern of Rear Driveline Module Audible Noise Heard Between 20-70MPH.
23-NA-1922023-11-15. Service bulletin. POWER TRAIN. This informational bulletin provides Information on Wheel Drive Shaft Replacement and Nut Removal Damage.
17-NA-2812023-09-29. Service bulletin. POWER TRAIN. This service bulletin provides information on RDM Axle Ratios for AWD Vehicles for Vibration Diagnostics When Using the Pico Scope.
23-NA-1532023-09-26. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay.
PIP5621D2023-09-18. Service bulletin. POWER TRAIN. This Preliminary information communicates to the dealer technician that TAC recommends the utilization of the GDS2 software to aid in diagnosing automatic transmission concerns. TAC is requesting the GDS2 session logs be sent in before the dealer contacts TAC.
21-NA-1812023-09-09. Service bulletin. POWER TRAIN. This service bulletin provides 9th gear operation information to respond to customers that may comment on transmission shift operation.
15-00-89-004F2023-09-08. Service bulletin. STEERING; SUSPENSION; ENGINE AND ENGINE COOLING; POWER TRAIN. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
21-NA-1692023-09-06. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION. This service bulletin provides diagnostic information/procedures to aid the service technician in diagnosing 9T45/50/60 automatic transmissions with low mileage and DTCs current or history related to the control solenoids and valves.
20-NA-1362023-09-06. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin describes/outlines the process for the 9T65 Automatic Transmission Replacement Pilot Program (U.S. Only).
17-NA-0662023-07-25. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN. This service bulletin provides information for automatic transmission Oil Cooler Flush and flow test.
17-NA-0662023-07-13. Service bulletin. POWER TRAIN. This service bulletin provides information for automatic transmission Oil Cooler Flush and flow test.
04-07-30-013E2023-06-19. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. This service bulletin provides information to dealership personnel on automatic transmission shift and engine driveability concerns and/or MIL ON due to aftermarket oil bath air filter use.
PIC5650K2023-06-13. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:IGNITION. This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble Codes B3055, B3060, and/or B3935. Technician should not replace any parts for this concern. If unable to duplicate the concern ask if the customer uses any Radio Frequency Identification Devices when the concern is present. Dealer should also direct their customers to the appropriate section in the Owner manuals that references that the device complies.
08-07-30-026H2023-06-06. Service bulletin. POWER TRAIN. This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
23-NA-0722023-06-05. Service bulletin. POWER TRAIN; VEHICLE SPEED CONTROL:ACCELERATOR PEDAL. This service bulletin provides a procedure to correct a customer concern of Shudders or Shakes at Low Speeds.
23-NA-0722023-05-04. Service bulletin. POWER TRAIN. This technical bulletin provides a procedure to correct the condition of Shudders or Shakes at Low Speeds.
PI0281J2023-05-04. Service bulletin. POWER TRAIN; STEERING; STRUCTURE; SUSPENSION; ENGINE AND ENGINE COOLING. This preliminary informational (PI) bulletin provides information to dealership personnel which may be helpful when addressing underbody component corrosion with customers.
08-07-30-035G2023-04-22. Service bulletin. POWER TRAIN. This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
PIT5893A2023-03-13. Service bulletin. POWER TRAIN; SEATS; LATCHES/LOCKS/LINKAGES:HATCHBACK/LIFTGATE:LOCK. This Preliminary information communicates that power liftgate actuators have been returned for warranty due to improper removal procedures. The technician is instructed on how to properly remove the power liftgate actuator from the vehicle without damaging it.
99-04-20-002N2023-03-03. Service bulletin. POWER TRAIN. This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation.
23-NA-0212023-03-01. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. This service bulletin advises the tech that the rotational Clicking Noise Heard After Engine Shut Down may be normal characteristics of the vehicle.
18-NA-0352023-02-21. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. This service bulletin provides information on a normal characteristic of a transmission that will not shift into overdrive range during cold ambient temperatures.
PIT5847H2023-02-13. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. This Preliminary information communicates that a vehicle may come into the dealer with various concerns which may include a service engine light or various warning messages on the DIC. The technician is instructed to inspect a wiring harness for chaffing on a bracket which is located beneath the battery tray, at a transmission stud and at the transmission oil cooler line bracket. If damage to the harness is found the technician is instructed to repair the damaged wiring and secure the harness away from the bracket so that future damage to the harness will be eliminated.
16-NA-3382023-01-05. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
PIE0720A2022-12-07. Service bulletin. POWER TRAIN. This engineering information (EI) closure ends the need to gather further information from technicians in regards to Vehicle Will Not Move When in Drive, Neutral and/or Reverse and DTCs P0746, P0747 Set.

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