2021 GMC Sierra 1500 Technical Service Bulletins

1,454 technical service bulletins (TSBs) are on record for the 2021 GMC Sierra 1500. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11012930Jan 4, 2025Other or unknown. This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance programs.
• 11012908Dec 21, 2024Other or unknown. This service bulletin provides information for customers/dealers/technicians on Normal Camera Display Operation - Flashing Diamond - Spot - or UFO like image on Camera Display.
• 11012247Dec 19, 2024Brakes. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
• 11012907Dec 18, 2024Engine. This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
• 11012027Dec 18, 2024Electrical system, Other or unknown. This Preliminary Information communication provides information to the technician about vehicles that are found to have a back-up alarm inoperative during the Pre-Delivery Inspection. On trucks equipped with the Back Up Alarm (RPO 8S3), the alarm will be intentionally left disconnected from the assembly plant. Technician will reroute the harness and plug it in.
• 11011880Dec 17, 2024Transmission and drivetrain. Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code. Dealers are to install a new control valve body.
• 11012690Dec 14, 2024Other or unknown. This warranty administration bulletin provide policy information for variable diagnostic time allowances on select labor operations (U.S. Only).
• 11011826Dec 13, 2024Transmission and drivetrain. Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code.
• 11011780Dec 12, 2024Transmission and drivetrain. Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code.
• 11011782Dec 7, 2024Other or unknown. This Preliminary Information communication provides information to the technician about the use of J-35616-64B terminal test probe, replacement terminals, and terminated leads. The J-35616-64B is the latest test probe released for checking tension or probing the .64 series terminals. The test probe terminal has been released in the terminal repair kit (J-38125-620H) located in Lear Tray 7 part number 963716-2.
• 11012189Dec 6, 2024Electrical system. This service bulletin provides information on the Transport Mode Feature, also known as Logistics mode, which is used to increase the 12V Battery stand time of the vehicle during transit and or long period of stand time at the dealerships.
• 11011805Dec 6, 2024Other or unknown, Electrical system. This Preliminary information communicates a GM part number for reflective high temperature heat or insulating tape when repairing wiring harnesses.
• 11011687Dec 4, 2024Back-over prevention (rear camera), Other or unknown. This Preliminary information communication provides information to the technician on installing Regular Production Option Code UVC Rearview Camera. Technician will need to reference the latest version of General Motors Up-fitter Integration Bulletin 152. The information can be found at http://www.gmupfitter.com/ under the "Technical Bulletin" Tab and then "Show all bulletins."
• 11012009Nov 27, 2024Transmission and drivetrain. This bulletin helps aid the tech in possible transmission noise that may be normal or abnormal depending on the concern noted.
• 11011993Nov 27, 2024Transmission and drivetrain, Wheels, Air bags. This service bulletin provides repair information to correct customer concerns of Wheel Lock Up, ABS Event, Loud Bang and a Flashing “D” on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.
• 11011989Nov 27, 2024Transmission and drivetrain. This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid.
• 11010810Nov 27, 2024Transmission and drivetrain. Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure within the valve. The effects can cause harsh shifting, setting a service engine soon message, reduced engine performance or P0747 diagnostic trouble code.
• 11011996Nov 25, 2024Other or unknown, Electrical system. This service bulletin provides diagnostic/repair information to correct a customer concern of Cellphone not Charging or USB Receptacle Inoperative.
• 11011946Nov 22, 2024Visibility (wipers, defrost, mirrors). This informational bulletin provides information on Outside Rear View Mirror Defog or Defrost Times Different for Passenger and Driver Mirrors.
• 11011911Nov 22, 2024Engine. This bulletin provides diagnostic information when checking the exhaust system for leaks.
• 11011900Nov 22, 2024Engine. This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
• 11011347Nov 22, 2024Electrical system, Other or unknown. This Preliminary information communicates an issues will low or poor heater performance on the drivers side. Dealers are to inspect the HVAC temperature door linkage and if ok replace the heater core.
• 11011876Nov 15, 2024Engine. This informational bulletin advises the technician of a part number change for long block engines used in the trucks noted.
• 11011382Nov 15, 2024Brakes. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
• 11011368Nov 15, 2024Electrical system. This Preliminary information communicates and issue with a no crank, Key Learn Pending or Ready For FOB 3 Message, Unable To Exit RVS With Push To Start Button, Symptoms Of A Dead Battery and has dealership inspect to see if the vehicle is falsely entering the manual transmitter programming and if so to replace the drivers power window switch.
• 11011704Nov 7, 2024Body and structure. This informational bulletin provides technicians and dealership personnel with spray-in bed liner general information and repair procedures.
• 11011709Nov 5, 2024Engine, Body and structure, Wheels, Other or unknown, Brakes. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
• 11011858Nov 4, 2024Engine. This informational bulletin advises the technician of which pan to use if the LCE has been replaced and to install an aluminum pan should be used with a new LCE.
• 11011210Oct 30, 2024Brakes. This technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris.
• 11011381Oct 29, 2024Engine. This informational bulletin advises the technician of a part number change for long block engines used in the trucks noted.
• 11011367Oct 28, 2024Electrical system, Other or unknown. This informational bulletin provides a guide on how to diagnose and test for vibrations utilizing the PicoScope.
• 11011205Oct 28, 2024Steering, Transmission and drivetrain, Engine. This informational bulletin explains Unscheduled Supplemental Services and the importance of GM Simplified Maintenance Schedules.
• 11011182Oct 25, 2024Engine. This engineering information (EI) closure ends the need for gathering further information from technicians in regard to a Chirp, Squeal, and/or Whine Type Noise Heard from Front of Vehicle During a Cold Start and/or While in Operation.
• 11009170Oct 25, 2024Electrical system. This Preliminary information communicates additional information on how a LIN bus operates and diagnostic tips when working on a LIN bus.
• 11009156Oct 25, 2024Electrical system. This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8 starting/charging tester and Vehicle Data Recorder tools, giving website address and step by step instructions to complete the update.
• 11009113Oct 25, 2024Brakes. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
• 11009094Oct 24, 2024Body and structure. This Preliminary information communicates that it is normal for the tailgate to drop faster than it used to after the GM Accessory Kicker Audio System is installed.
• 11011459Oct 23, 2024Transmission and drivetrain. This Preliminary information communicates a possible retainer ring dis-lodged for a DTC P2714, may not have reverse as well.
• 11009055Oct 22, 2024Brakes. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
• 11008986Oct 18, 2024Electrical system. This Preliminary information communicates direction and examples when diagnosing multiple DTCs, one of which includes U**** Byte 71 DTC.
• 11008982Oct 18, 2024Engine. This Preliminary information communicates the possibility of the Intake Cam Actuator cover plate screws backing out and making unwanted contact with the Cam Carrier.
• 11011447Oct 17, 2024Other or unknown. This Preliminary Information communication provides information to the technician how to repair vehicles that Instrument Panel Cluster, Radio, and Heater-Vent-Air Conditioning display blanks out, Bluetooth phone or Pandora connection dropped, the radio station or volume changes when operating the snow plow. Please advise the customer that engineering is aware of this concern and working on this issue.
• 11010901Oct 17, 2024Electrical system. This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system that may be causing a drain.
• 11011444Oct 16, 2024Other or unknown. This Preliminary information communicates to the dealer a process for accessing the procedure to add attachments to a GM technical assistance case using the dealer case management tool.
• 11011234Oct 16, 2024Engine. This bulletin advises the tech of a part number change for the engine kit assembly.
• 11010831Oct 16, 2024Engine. This bulletin advises the tech of a part number change for the engine kit assembly.
• 11010724Oct 16, 2024Other or unknown, Electrical system. This service bulletin provides a procedure to correct radio software concerns.
• 11011443Oct 15, 2024Fuel system. This Preliminary information communicates information on faulty replacement K111 Fuel Pump Driver Control Module.
• 11010874Oct 15, 2024Fuel system. This bulletin provides information on how to look for and test for DEF or water in the fuel system and what the specs should be.
• 11010576Oct 11, 2024Other or unknown. This service bulletin provides information on All hazmat parts being returned to the Warranty Parts Center (WPC) must be shipped using Central Transport. Hazardous materials should never be sent by air transportation to the WPC.

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