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.

• 11014621Mar 2, 2025Transmission and drivetrain. This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement
• 11014640Feb 28, 2025Engine. 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.
• 11015409Feb 25, 2025Suspension, Wheels. This service bulletin provides information on Wheel Alignment Specifications, Requirements and Recommendations for GM Vehicles.
• 11015387Feb 22, 2025Other or unknown. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only).
• 11014461Feb 22, 2025Other or unknown. This Preliminary information communicates an issue with blower motor speed changing when air flow is blocked by snow.
• 11014458Feb 21, 2025Other or unknown. This Preliminary information communicates an issue with poor heater performance and advises dealerships to inspect the heater core inlet and outlet hoses for being twisted or kinked.
• 11015382Feb 20, 2025Body and structure. This informational bulletin provides a procedure on how to remove the paint stain that may present itself under the shipping film.
• 11015042Feb 20, 2025Suspension. This technical bulletin provides repair information to correct a customer concern of a squeak and/or clunking noise coming from the rear of the vehicle.
• 11014455Feb 20, 2025Other or unknown. This Preliminary Information communication provides information to the technician about vehicles that have an unusual noise and is difficult to identify, isolate or pinpoint. Technician should get record a sound clip or take a video of the noise for assessment by engineering. Technician will need to call General Motors Technical Assistance Center for further assistance.
• 11014579Feb 19, 2025Back-over prevention (rear camera), Electrical system, Body and structure. This technical bulletin provides repair information to correct a customer concern of Diagnostic Tips For Park Assist Off Message / Unwanted Or False Park Assist Alerts / No DTCs.
• 11014577Feb 18, 2025Steering. This service bulletin provides a procedure inspecting for excess grease or Sealant on the Exterior of the steering gear due to seeing grease or sealant on certain locations on the gear.
• 11014450Feb 18, 2025Other or unknown. This Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. This is normal when the FAB has been set to "Alert".
• 11014449Feb 18, 2025Other or unknown. This Preliminary information communicates information on how to disable the Side Blind Zone Detection and Park Assist systems when a customer removes the pickup box from the vehicle to install an aftermarket bed or body.
• 11014448Feb 18, 2025Other or unknown. This Preliminary information communicates an issues with a service keyless entry message caused by aftermarket door handle covers and they should be removed.
• 11014602Feb 17, 2025Engine, Electrical system. This bulletin provides information to the tech on how to diagnosis the EGR system from possible issue that may cause the DTCs to set and cause the customers concern of a MIL Illuminated.
• 11014323Feb 15, 2025Other or unknown. This Preliminary information communicates a diagnostic tip for a thump, click, pop, clunk type noise that is heard from the front end. Dealers are to inspect for something contacting the grill shutters as they open and close.
• 11014565Feb 13, 2025Transmission and drivetrain. This bulletin helps aid the tech in possible noise that may be normal or abnormal depending on the concern noted.
• 11014563Feb 13, 2025Other or unknown. This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance programs.
• 11014353Feb 12, 2025Transmission and drivetrain. This service bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
• 11014297Feb 12, 2025Other or unknown. This Preliminary information communicates an issues with the HVAC making a hum buzz noise when the blower is set to a higher speed. Engineering is working on a new HVAC door seal material to correct the noise.
• 11014063Feb 7, 2025Other or unknown. This Preliminary Information communication provides information to the technician about fluid leaking from the brake caliper piston area found during a service of the vehicle. The substance is actually excess assembly grease from the caliper boot and piston installation. This grease can be cleaned off and the rest of the service completed.
• 11014054Feb 5, 2025Other or unknown. This Preliminary information communicates an issue with a wind noise while driving at highway speeds and dealers are to inspect the body harness pass through for being full seated into the cowl.
• 11014044Feb 3, 2025Transmission and drivetrain. 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.
• 11014021Feb 1, 2025Body and structure. This technical bulletin provides repair information to correct a customer concern of vertical misalignment between cab and pickup box on driver side of vehicle.
• 11014019Feb 1, 2025Body and structure. This technical bulletin provides repair information to correct a customer concern of the pickup box being out of alignment.
• 11014230Jan 31, 2025Visibility (wipers, defrost, mirrors), Brakes, Wheels, Electrical system, Engine. 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.
• 11014171Jan 31, 2025Body and structure, Vehicle speed control. This service bulletin provides information on proper use of floor mats.
• 11014238Jan 30, 2025Body and structure, Other or unknown. This warranty administration service bulletin provides information about GM Accessories - Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.
• 11014233Jan 30, 2025Engine. This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
• 11014239Jan 29, 2025Electrical system, Other or unknown. 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.
• 11013395Jan 29, 2025Other or unknown. 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.
• 11014222Jan 28, 2025Electrical system, Other or unknown. This service bulletin provides information to inform dealership personnel about Law Enforcement and Government vehicles that request to disable or enable content.
• 11014161Jan 28, 2025Engine, Fuel system. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regard to the vehicle having loss of power and/or having the MIL illuminated on the Driver Information Center (DIC).
• 11013150Jan 28, 2025Transmission 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.
• 11014170Jan 27, 2025Exterior lighting. This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines.
• 11013472Jan 24, 2025Other or unknown. This Preliminary information communicates a possible retainer ring dis-lodged for a DTC P2714, may not have reverse as well.
• 11013650Jan 23, 2025Engine, Electrical system. This technical bulletin provides a procedure to locate and repair a broken ground stud at the NOx converter.
• 11013639Jan 23, 2025Electrical system, Wheels. This technical bulletin provides repair information to correct a customer concern of Trailer Tire Pressure Only Reading Up To 100 PSI, New Parts To Increase To 147 PSI.
• 11013242Jan 17, 2025Brakes, Electrical system. This informational bulletin advises the technician to check for faults that may be caused by the trailer otherwise found by a possible faulty trailer connector.
• 11013269Jan 16, 2025Body and structure, Seats, Engine, Steering, Electrical system. This informational bulletin provides a guide on how to diagnose and test for vibrations utilizing the PicoScope.
• 11013255Jan 15, 2025Electrical system, Engine. This technical bulletin provides a procedure to program the Reductant Control Module and Setup and Perform the Reductant Fluid Tank Level Reset.
• 11013082Jan 10, 2025Electrical system, Engine. This bulletin advises the technician that if the code sets, verify the sensor then inspect the engine oil pump for a sticking valve that may cause the MIL to illuminate.
• 11012973Jan 10, 2025Other or unknown. This Preliminary information communicates an issues of the left rear leaf spring making a squeaking noise due to diesel fuel contamination that may occur during refueling after the fuel nozzle is removed from the fuel filler pipe. Dealers are to create a foam seal around the fuel filler pipe to prevent fuel from leaking onto the left spring.
• 11013069Jan 9, 2025Engine, Transmission and drivetrain, Electrical system. This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
• 11013027Jan 9, 2025Engine. This informational bulletin advises the technician on normal noises produced by the engine and to explain this to the customer.
• 11012943Jan 9, 2025Transmission and drivetrain. This Preliminary information communicates a possible retainer ring dis-lodged for a DTC P2714, may not have reverse as well.
• 11012938Jan 9, 2025Brakes. This Preliminary Information communication provides information to the technician about customers that may request the factory Integrated Trailer Brake Controller Regular Production Option Code (JL1) be installed on their Full-Size Pickup or SUV when the vehicle was not ordered with the option. Dealer should advise the customer it cannot be added to the vehicle.
• 11013070Jan 8, 2025Engine. This service bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.
• 11012932Jan 7, 2025Brakes. This Preliminary information communicates an issue with premature brake pad life and engineering is working on release new pad lining material.
• 11012929Jan 7, 2025Electrical system. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements.

← All problems reported for the 2021 GMC Sierra 1500