Service bulletins for the 2012 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.
2268 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
| PI0339B | 2017-10-12. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION. This preliminary informational bulletin provides a procedure to replace a terminal for comments regarding Instrument Panel Cluster (IPC) Warning Lamps and/or MIL are Illuminated, Diesel Exhaust Fluid (DEF) Message Displayed, Various DTCs Set, Transmission May Not Shift or Defaults to Second Gear (Inspect Wiring Harnesses for Chafing, Connectors Not Fully Seated, and Backed Out or Damaged Terminals, Repair as Needed) |
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| 09-07-30-018C | 2017-10-12. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION. This warranty administration bulletin provides information on the change in automatic transmission add conditions documentation and claim submissions |
| 16-NA-338 | 2017-08-31. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. 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. |
| PIP3161H | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication provides information to the technician about vehicle with a clunk type noise on start up with the vehicle in park when the vehicle is equipped Allison LCT1000 transmission. This condition is considered to be an operating characteristic of the Allison LCT1000 transmission. |
| PIT5442 | 2017-08-15. Service bulletin. POWER TRAIN; EQUIPMENT:ELECTRICAL. This Preliminary Information communication provides information to the technician of an engine power reduced message on the driver information center after performing the Canada Onstar® 4G upgrade. If the concern is present park the vehicle outside and call General Motors Technical Assistance Center. |
| PI1343 | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This preliminary bulletin provides a procedure to reprogram the tcm to correct the customers concern of a harsh, tie up feeling from a 6-4 downshift. |
| PI1344A | 2017-08-15. Service bulletin. POWER TRAIN:CLUTCH ASSEMBLY. This preliminary bulletin provides a procedure to remove and inspect the clutch select solenoid valve for damage, located in the valve body to correct the customers concern of reduced acceleration at low speeds and trans slip at lauch. |
| PI1343A | 2017-08-15. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This preliminary bulletin provides a procedure to reprogram the tcm to correct the customers concern of a harsh, tie up feeling from a 6-4 downshift. |
| PIT4575D | 2017-08-15. Service bulletin. POWER TRAIN; ENGINE. This Preliminary Information communication advises the technician vehicles with Regular Production Option Code HP2 may stall after shifting out of park quickly after a key crank. The 2-Mode Hybrid requires a certain amount of engine run time (1-2 seconds) from initial key crank before moving the gear shift indicator out of park. This is a normal condition and no parts should be replaced to try and resolve this concern. |
| PI0876 | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This preliminary informational bulletin provides information on replacing the transmission fluid level indicator if a customers comments regarding one being broken. |
| PI0020D | 2017-08-15. Service bulletin. POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. This preliminary informational bulletin provides technicians with information on the normal condition of white, milky or cloudy appearance of front differential fluid. |
| 06-00-89-026L | 2017-08-15. Service bulletin. SERVICE BRAKES; EQUIPMENT:ELECTRICAL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; EQUIPMENT:APPLIANCE:AIR CONDITIONER; POWER TRAIN:AXLE ASSEMBLY; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM. This warranty administration bulletin provide policy information on a revised customer concern not duplicated/verified labor operation numbers and how to submit CCND. |
| PIP3119N | 2017-08-15. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR; POWER TRAIN. This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have a Service Engine Soon Malfunction Indicator Lamp on at low mileage. Technician may find Diagnostic Trouble Codes P0420 and or P0430 stored. Technician should be advised that the catalytic converter efficiency Diagnostic Trouble Codes P0420 and P0430 are disabled for the first hour of engine run time to allow break-in of the catalytic converter. Technician will need to use a Tech2 to check the verify engine run time on the Engine Hour Meter in the Instrument Panel Cluster Data Display/Data 1 List in the scan tool match. If the engine run time is less than one hour, the battery may have been disconnected, or another vehicle power loss event may have occurred, during vehicle manufacturing. Technician will need to clear the Diagnostic Trouble Codes and perform a drive cycle. If the catalytic converter was replaced and the Diagnostic Trouble Codes set it may be a result of the engine run time restrictions no longer being in place since the vehicle is no longer new. Technician will need to clear the Diagnostic Trouble Codes and perform a drive cycle. |
| PIP5012D | 2017-08-15. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that have a clunk noise or a harsh 6-5 downshift while driving at 50 to 70 miles per hour. Technician will reprogrammed the Transmission Control Module and a FastLearn procedure will need to be performed to correct the condition. |
| PIP4112M | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication provides information to the technician of a complaint of a sag or hesitation when accelerating. The concern is present when coasting at low speeds of less than 15 miles per hour and then aggressively applying the throttle, or after making a hard stop followed by an aggressive throttle. This is considered normal operation of the vehicle the throttle is delayed and opened slowly up to .7 seconds to help minimize driveline lash and clunking or will have approximately .5 seconds of zero torque to allow the transmission to shift to first gear. |
| PIP4112L | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication provides information to the technician of a complaint of a sag or hesitation when accelerating. The concern is present when coasting at low speeds of less than 15 miles per hour and then aggressively applying the throttle, or after making a hard stop followed by an aggressive throttle. This is considered normal operation of the vehicle the throttle is delayed and opened slowly up to .7 seconds to help minimize driveline lash and clunking or will have approximately .5 seconds of zero torque to allow the transmission to shift to first gear. |
| PIP4560Q | 2017-08-15. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This Preliminary Information communication advises the technician that the Allison Transmission Control Module Part Restriction through the General Motors Product Quality Center. Dealer will need to contact General Motors Product Quality Center for further assistance. |
| PIP3161F | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication provides information to the technician about vehicles with a clunk type noise on start up with the vehicle in park when the vehicle is equipped Allison LCT1000 transmission. This condition is considered to be an operating characteristic of the Allison LCT1000 transmission. |
| PIP4560N | 2017-08-15. Service bulletin. POWER TRAIN. This Preliminary Information communication advises the technician that Allison Transmission Control Module part number 24256861 will be placed on a parts restriction through the General Motors Technical Assistance Center. Dealer will need to contact General Motors Technical Assistance Center for further assistance. |
| PIP5068A | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ENGINE AND ENGINE COOLING. This Preliminary Information communication provides information to the technician abut vehicles that have a knock noise or vibration from the engine or transmission. Technician will need to inspect the flex plate. The flex plate and transmission bell housing should be replaced if the flex plate is found cracked. |
| PIP5021B | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication advises the technician that the Allison 6 Speed Automatic Transmission Assembly will be placed on a parts restriction through the General Motors Product Quality Center. Dealer will need to contact General Motors Product Quality Center for further assistance. |
| PIP4560P | 2017-08-15. Service bulletin. EQUIPMENT:ELECTRICAL; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This Preliminary Information communication advises the technician that the Allison Transmission Control Module will be placed on a parts restriction through the General Motors Technical Assistance Center. Dealer will need to contact General Motors Technical Assistance Center for further assistance. |
| PIP5113A | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication provides information to the technician about vehicles that during the first few launches after a key cycle, they experience a delayed 1-2 upshift. Technician can update the Transmission Control Module with the latest calibration is available through TIS2Web. |
| PIP5113 | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; ELECTRICAL SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that during the first few launches after a key cycle, they experience a delayed 1-2 upshift or a sluggish launch with high engine speed. Technician will need to update the Transmission Control Module with the latest calibration is available through TIS2Web. |
| PIP5021A | 2017-08-15. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary Information communication advises the technician that the Allison 6 Speed Automatic Transmission Assembly part numbers 24257850, 24242411, 24258552, 24258551, 24257851, 24242413, 24258554, and 24258553 will be placed on a parts restriction through the General Motors Product Quality Center. Dealer will need to contact General Motors Product Quality Center for further assistance. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.