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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 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
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.
20NA1422020-12-21. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This Technical bulletin provides a repair to correct a condition of Shudder/Surging While Driving.
20NA0782020-12-21. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; POWER TRAIN:CLUTCH ASSEMBLY; EQUIPMENT. This technical bulletin provides a procedure to replace the 4 5 6 clutch housing if the bushing was found worn and the cause of the customers concern.
19NA0762020-12-21. Service bulletin. VISIBILITY; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; POWER TRAIN. This technical bulletin provides repair information to correct a customer concern of Blue or Black Screen and Service Rear Vision System Message on Radio Display Shifting into Reverse.
PIE0583A2020-12-07. Service bulletin. POWER TRAIN. This engineering information (EI) is requesting information from technicians and to contact the engineers listed in regards to Transmission Performance Issues without a Current or History DTC and Unable to Duplicate the Customer Concern (CCND).
PIE0556A2020-12-07. Service bulletin. POWER TRAIN. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the transmission.
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.
19NA1872020-11-30. Service bulletin. ENGINE; POWER TRAIN; EQUIPMENT. This bulletin provides additional information on how to graph a cylinder misfire and a possible diagnostic cause.
PIE05832020-10-26. Service bulletin. POWER TRAIN. This engineering information (EI) is requesting information from technicians to provided the engineers listed in regards to Early, Late, Harsh and/or Slip Type Transmission Performance.
20NA1872020-10-26. Service bulletin. POWER TRAIN. This technical bulletin provides a repair procedure to correct a customer concern of Delayed and/or Harsh Engagement of Transmission Shift After Vehicle Sitting with Engine Off.
16NA0192020-10-26. Service bulletin. POWER TRAIN. This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
PIP5722A2020-10-19. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates to the dealer technician diagnostic tips to aid in finding root case of P0708 setting on vehicles equipped with 8L45, 8L90, 10L60, 10L80 and 10L90 transmissions.
16NA3612020-09-28. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin explains possible normal condition of a flare from 1st to 2nd, even if the trans had been repaired for the flare and its still noticed.
PIP5653J2020-09-14. Service bulletin. STEERING; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT. This Preliminary information communicates that engineering has developed a repair for a chirp noise associated with the front axle assembly.
PIP5653H2020-09-14. Service bulletin. POWER TRAIN:AXLE ASSEMBLY; EQUIPMENT. This Preliminary information communicates that engineering has developed a repair for a chirp noise associated with the front axle assembly.
16NA3382020-08-31. Service bulletin. ENGINE; 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 for Canadian Dealers only.
N192282860 012020-08-10. Service bulletin. POWER TRAIN. Service Update (Population Expansion). Certain vehicles may have a condition where the transmission enters a neutral state when the internal range sensor (IRS) fault is active. Dealers are to reprogram the transmission control module.
PIP5653G2020-08-10. Service bulletin. EQUIPMENT; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT. This Preliminary information communicates that engineering has developed a repair for a chirp noise associated with the front axle assembly.
PIP5655B2020-08-10. Service bulletin. EQUIPMENT; POWER TRAIN:AUTOMATIC TRANSMISSION. This Preliminary information communicates to the dealer technician that the 10L1000 transmission have been place on a part restriction. Dealers are to contact the Product Quality Center before replacing the transmission assembly.
PIP5504F2020-08-10. Service bulletin. ENGINE; POWER TRAIN. This Preliminary Information communication provides information and definitions to the technician about vehicles that have fishbite, chuggle, misfire, AFM disturbances or torque converter shudder/vibration concerns. Technician are advised to use PICO software to determine root cause of the concern. If torque converter shudder is confirmed technicians are referred to Torque Converter Diagnosis in SI.
PIP5504E2020-08-10. Service bulletin. POWER TRAIN. This Preliminary Information communication provides information and definitions to the technician about vehicles that have fishbite, chuggle, misfire, AFM disturbances or torque converter shudder/vibration concerns. Technician are advised to use PICO software to determine root cause of the concern. If torque converter shudder is confirmed technicians are referred to Torque Converter Diagnosis in SI.
PIP5175D2020-08-10. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:GEARS; ENGINE AND ENGINE COOLING. This Preliminary Information communication provides information to the technician about vehicles that may have a delayed engagement into drive, shudder at a launch, or the transmission is slipping when shifting into 1st, 2nd, 3rd or 4th gears. This may be due to loose stator support to pump cover bolts causing a leak at the stator support to pump cover gasket. Technician will check for the bolts to be loose. If any of the bolts are loose or the gasket is misaligned or leaking, the transmission pump cover must be replaced and the 1234 clutch plates should be inspected for being distressed and repaired as needed.
20NA1382020-08-10. Service bulletin. POWER TRAIN. This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and information on Submission of Warranty Transaction in Global Warranty Management.
19NA2282020-08-10. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM. This technical provides a procedure to locate, disconnect and re-connect the TCM electrical connector if found the cause of the customers concerns.
N1922724002020-06-29. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION; WHEELS. Customer Satisfaction Program - Certain 2019-2020 model year Chevrolet Silverado and GMC Sierra vehicles, equipped with an 8-Speed Automatic Transmission, may have a condition where the rear wheels will lock up at low speeds. An intermittent short circuit is being caused by wire bonds moving under high current and thermal load, making contact with adjacent wire(s) in the transmission control module (TCM). Dealers will replace the TCM.

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