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Service bulletins for the 2018 Buick LaCrosse

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.

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

By type

By component

By trouble code

By topic

Only bulletins with component: Automatic transmission are shown. Show all

Bulletins, newest first
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.
PIP5621C2022-10-17. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); 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.
990420002L2021-08-09. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION; POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT. This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation.
16-NA-407 42021-04-14. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Information on Chassis Control Module (CCM) and Hybrid Powertrain Control Module (HPCM) Receives Invalid Data and Sets DTC U0422 The technician may find DTC U0422 set. The technician may also find the following DTCs set: • U1534 • U1538 Based on analysis with the BCM and Hybrid Powertrain Control Module (HPCM) teams, during vehicle startup (on occasion) the PEPS module arbitration along with high bus traffic leads to the BCM or HPCM setting the door open switch virtual device availability (VDA) to unavailable. The BCM or HPCM does not update the VDA back to Available until the door switch changes state (this signal is event based as opposed to periodic). The ICCM and HPCM sets the U0422 DTC after 1 second of either the door ajar VDA or door open VDA being unavailable
150089004C2021-03-08. Service bulletin. SUSPENSION:FRONT:MACPHERSON STRUT; SUSPENSION:FRONT:SHOCK ABSORBER; POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT. 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.
060089031F2020-12-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE. This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
1308116001F2020-12-07. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION. The intent of this technical bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other diagnostic methods to identify them.
N1922163102019-12-30. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. N192216310 - Service Update - Certain vehicles may have a condition wherethe customer may be able to shift out of park with and expired latent fault mode counter. This will only occur after the customer ignores multiple driver information center (DIC) and chime warnings. By design, the vehicle should not allow the driver to shift out of park once the latent fault mode counter expires. Dealers are to reprogram the chassis control module.
080730026F2019-09-23. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin provides information on Some vehicles 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.
PIC6244D2019-08-12. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication provides information to the technician about vehicles that have a Shift to Park message on the Driver Information Center. Technician will find Diagnostic Trouble Codes P1AEE, P1AEF, P1AF0, P1AF2, and P1E22. Technician will need to replace the transmission. Technician will need to review the latest version of PIP5321 for the Volt and PIP5390 for the Malibu.
PIC6244B2018-11-13. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication provides information to the technician about vehicles that have a Shift to Park message on the Driver Information Center. Technician will find Diagnostic Trouble Codes P1AEE, P1AEF, P1AF0, P1AF2, and P1E22. Technician will need to replace the transmission. Technician will need to review the latest version of PIP5321 for the Volt and PIP5390 for the Malibu.
PIC63032018-05-21. Service bulletin. ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This Preliminary information communicates to look for other codesP0AEE, P0AF3, P0BD2, P0BD7, P0BDC, P0BE1 if a customer comes in with a Mil Request.
PIP55122018-05-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates that the valve body assembly for any vehicle equipped with a 9T50/60 transmission assembly equipped with the ETRS will require engineering review for possible complete transmission assembly replacement if diagnoses leads to be a valve body or ETRSconcern.
PIC62972018-05-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN:MANUAL TRANSMISSION. This Preliminary information communicates that engineering is working on a fix for P3260.
17-NA-0662018-05-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This warranty administration bulletin provide policy information for automatic transmission Oil Cooler Flush and flow test.
18NA0972018-05-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This technical bulletin provides a procedure to reprogram the TCM to correct a condition of Vehicle Wont Shift Out of Park, Stuck in Gear or Tie Up Feeling on 1-2 Shift, Wont Shift Into Park or Reverse, PRNDL May Blink with Possible DTC P187D, P2731, or U0100.
17NA1902018-05-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This informational bulletin provides information for technicians during diagnosis for DTC U0420.
060089031E2018-05-21. Service bulletin. ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
16NA3382018-05-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE. This Bulletin provides guidelines 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.
16NA4072018-04-23. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This informational bulletin advised the technician not to do anything about the DTC set.
16NA407 42018-04-23. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This informational bulletin advised the technician not to do anything about the DTC set.
PIP5486A2018-01-16. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates possible concerns and a diagnostic strategy to locate and repair various noises within the engine as well as some misfire causes.

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