# 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 bulletins from NHTSA, as of 2026-10-19. - [PIP6127B](/bulletins/11038463.md), 2026-10-14, Service bulletin: UNKNOWN OR OTHER. This document assists GM dealer technicians with diagnosing torque converter concerns to ensure torque converter replacement is necessary. The torque converter part number will be placed on order restriction, and the technician will be asked to follow 25\-NA\-148 before requesting a part through PQC. - [PIT5698F](/bulletins/11037555.md), 2026-09-30, Service bulletin: UNKNOWN OR OTHER. This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it. - [PIP5700H](/bulletins/11037550.md), 2026-09-29, Service bulletin: UNKNOWN OR OTHER. This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering - [PIP4902W](/bulletins/11037253.md), 2026-09-10, Service bulletin: UNKNOWN OR OTHER. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance. - [PIP6127A](/bulletins/11036713.md), 2026-09-02, Service bulletin: UNKNOWN OR OTHER. This document assists GM dealer technicians with diagnosing torque converter concerns to ensure torque converter replacement is necessary. The torque converter part number will be placed on order restriction, and the technician will be asked to follow 25\-NA\-148 before requesting a part through PQC. - [PIT6031B](/bulletins/11036196.md), 2026-08-14, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates an issue where an aftermarket autostop device or rear taillights is causing a dead battery. - [PIP6127](/bulletins/11035709.md), 2026-08-04, Service bulletin: UNKNOWN OR OTHER. This document assists GM dealer technicians with diagnosing torque converter concerns to ensure torque converter replacement is necessary. The torque converter part number will be placed on order restriction, and the technician will be asked to follow 25\-NA\-148 before requesting a part through PQC. - [PIT5680B](/bulletins/11035350.md), 2026-07-30, Service bulletin: UNKNOWN OR OTHER. This PI provides information to repair the door water deflector which is not sealed properly allows water into the door jam/sill area. - [PIT5099J](/bulletins/11035340.md), 2026-07-29, Service bulletin: UNKNOWN OR OTHER. PI to help diagnose A/C concern - [PIT5509N](/bulletins/11035308.md), 2026-07-29, Service bulletin: UNKNOWN OR OTHER. This PI provides diagnostic tips for diagnosing electric trailer brakes issues. - [PIT6473F](/bulletins/11035133.md), 2026-07-21, Service bulletin: UNKNOWN OR OTHER. This PI was created to help avoid unnecessary front camera module replacements - [PIT5767B](/bulletins/11035127.md), 2026-07-21, Service bulletin: UNKNOWN OR OTHER. This PI provides a diagnostic tip on poor a/c performance due to a condenser issue and instructions to replace the ac condenser. - [PIT6532](/bulletins/11034977.md), 2026-07-13, Service bulletin: UNKNOWN OR OTHER. The purpose of this PI is to inform dealer technicians of a normal cab pressure relief valve noise to avoid unnecessary part replacement - [PIT5544J](/bulletins/11034767.md), 2026-07-07, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates information on a hydraulic rush type noise from the power steering gear. This noise is a characteristic of the new Active Hydraulic Assist System RPO NV8 and no repairs should be made. The noise is most noticeable in the cab at idle, in park, with all accessories turned off. - [PIT6523](/bulletins/11034001.md), 2026-06-18, Service bulletin: UNKNOWN OR OTHER. This PI provides diagnostic steps for dealer technicians to verify the condition and ensure that part replacement is necessary - [PIP6115](/bulletins/11032955.md), 2026-05-28, Service bulletin: UNKNOWN OR OTHER. The document advise technicians after an engine repair involving removal of the camshaft actuators, the vehicle may set p1101 P0172 and or stalls when taken off idle. The technician is instructed to verify the intake and exhaust camshaft actuators are installed onto the correct camshafts. - [PIT5509M](/bulletins/11032777.md), 2026-05-19, Service bulletin: UNKNOWN OR OTHER. This PI provides diagnostic tips for diagnosing electric trailer brakes issues. - [PIT5687B](/bulletins/11032659.md), 2026-05-13, Service bulletin: UNKNOWN OR OTHER. This PI provide diagnostic tip for an SES MIL with DTC P16A7 and/or P16AF. Dealers are to inspect for a loose connection. - [PIT5689N](/bulletins/11031509.md), 2026-04-23, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates that some customers may comment that after an auto\-stop event the engine does not restart and to inspect the engine ground strap. Temporarily on hold while PIE0572 is active. PIE0572 has now ended and reinstating the PI. - [PIT3271Q](/bulletins/11030974.md), 2026-04-07, Service bulletin: UNKNOWN OR OTHER. This preliminary information communicates information about how to determine if a wheel and tires size change is available. - [PIT6473E](/bulletins/11030353.md), 2026-03-31, Service bulletin: UNKNOWN OR OTHER. This PI was created to help avoid unnecessary front camera module replacements - [PIT6473C](/bulletins/11030170.md), 2026-03-19, Service bulletin: UNKNOWN OR OTHER. This PI was created to help avoid unnecessary front camera module replacements - [PIT6473D](/bulletins/11030169.md), 2026-03-19, Service bulletin: UNKNOWN OR OTHER. This PI was created to help avoid unnecessary front camera module replacements - [PIT6473B](/bulletins/11030097.md), 2026-03-17, Service bulletin: UNKNOWN OR OTHER. This Preliminary Information communicates direction for different audio issues with RPO UQA, UQF, UQS, or NKD - [PIP6104](/bulletins/11030092.md), 2026-03-17, Service bulletin: UNKNOWN OR OTHER. This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect. 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