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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: Transmission and driveline are shown. Show all

Bulletins, newest first
17NA0662019-03-25. Service bulletin. POWER TRAIN; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This warranty administration bulletin provide policy information for automatic transmission Oil Cooler Flush and flow test.
16NA3382019-03-18. Service bulletin. POWER TRAIN. This 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.
PIC63412018-12-17. Service bulletin. POWER TRAIN; ENGINE. This Preliminary information communicates that a customer may bring a vehicle in with a complaint that the engine rpm increased and/or the vehicle downshifted for no reason. The dealer is instructed to test drive the vehicle and check for codes. If no cause of the concern is found and it cannot be duplicated the dealer technician is instructed to review operation of the tap shift operation in the owner's manual. The technician is then instructed to drive the vehicle with the customer and downshift the vehicle using temporary tap shift mode to demonstrate this feature to the customer and see if this is what the customer is experiencing. If the customer states that this is what they are experiencing the dealer is advised to educate the customer on the tap shift operation.
PIC6244C2018-11-13. Service bulletin. POWER TRAIN. 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.
PIT5513F2018-08-20. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This Preliminary Information communication advises the technician that the Technical Assistance Center TAC has a part restriction for the hybrid/EV battery Pack, Hybrid/EV Powertrain Control Module (HPCM2), High Voltage Battery Interface Control Module 1 and 2, Drive Motor Generator Battery Cooling Blower. The dealer technician is advised to call the GMTechnical AssistanceCenter for further assistance
PIP5508B2018-08-06. Service bulletin. POWER TRAIN. This Preliminary Information communication advises the technician that the Product Quality Center has ended the part restriction for the T87A Transmission Control Module.
060089026N2018-06-04. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY:SUN/MOON ROOF ASSEMBLY; STRUCTURE:BODY:DOOR; POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE); VISIBILITY:WINDSHIELD; ELECTRONIC STABILITY CONTROL (ESC). This warranty bulletin provides labor operation numbers for customer concerns that cant be duplicated.
080730026E2018-06-04. Service bulletin. POWER TRAIN. 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.
040730013D2018-06-04. Service bulletin. POWER TRAIN; ENGINE; EQUIPMENT. This informational bulletin provides information to dealership personnel on automatic transmission shift and engine drivability concerns and/or MIL ON due to aftermarket oil bath air filter use.
17-NA-0662018-05-21. Service bulletin. POWER TRAIN. This warranty administration bulletin provide policy information for automatic transmission Oil Cooler Flush and flow test.
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.
18NA0542018-05-21. Service bulletin. POWER TRAIN. This technical bulletin provides a procedure to replace the transmission valve body separator plate for an upshift condition.
080730035C2018-05-21. Service bulletin. POWER TRAIN. This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
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.
18NA0542018-05-21. Service bulletin. POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY. This technical bulletin provides a procedure to replace the transmission valve body separator plate for an upshift condition.
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.
PIP5512A2018-01-16. Service bulletin. POWER TRAIN. 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.

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