2020 GMC Sierra 1500 Technical Service Bulletins

1,539 technical service bulletins (TSBs) are on record for the 2020 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.

• 10225615Oct 19, 2022Electrical system. This service bulletin provides information on Module Harvesting.
• 10226384Oct 18, 2022Engine cooling, Transmission 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.
• 10226382Oct 18, 2022Brakes. This Preliminary Information communication advises the technician that the Hydro-Boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
• 10225612Oct 18, 2022Equipment, Electrical system. This service bulletin provides radio software version 135120 (IOR) update procedures to correct customer concerns of software related issues.
• 10226370Oct 14, 2022Back-over prevention (rear camera). This Preliminary information communicates and issue when driving at highway speeds (above 60 mph) that there is a noise from the rear seat area that could be described as a buffering, pulsing, vibrating, roaring, booming type noise. Dealers are to fill the C pillar cavities with sound deadening material to correct the issue.
• 10226369Oct 13, 2022Equipment. This Preliminary information communication provides information to the technician on installing Regular Production Option Code 9L7 Up-fitter Auxiliary Switches. Technician will need to reference the latest version of General Motors Up-fitter Integration Bulletin 153. The information can be found at http://www.gmupfitter.com/ under the "Technical Bulletin" Tab and then "Show all bulletins."
• 10224856Oct 10, 2022Engine cooling, Electrical system. This technical bulletin provides repair information to correct a customer concern of Engine Wire Harness Chafing.
• 10224850Oct 10, 2022Electrical system, Fuel system, Engine cooling. This bulletin provides a possible location of a bad connection at the reductant fluid tanks electrical connector.
• 10226364Oct 7, 2022Back-over prevention (rear camera). This Preliminary information communicates to dealer of a possible concern with a display and the actions needed to correct the concern.
• 10224820Oct 7, 2022Equipment. This service bulletin provides information for dealers on how to submit a product information report (PIR) (Canada Only).
• 10224831Oct 4, 2022Body and structure. This Warranty Administration bulletin provides information on the Global Warranty Management (GWM) Warranty Parts Center (WPC) Parts Return Program.
• 10226356Oct 3, 2022Transmission and drivetrain. This Preliminary information communicates diagnostic aid to help isolate possible repeat thermal by-pass valve concern.
• 10222263Oct 3, 2022Visibility (wipers, defrost, mirrors). In certain vehicles, equipped with a manual HVAC system (RPO: C4P), the K33 HVAC Control Module may not properly enable the heater auxiliary coolant pump to maintain cabin heater temperature during engine auto stop events. Reprogram the K33 HVAC Control Module with updated software.
• 10222842Sep 29, 2022Engine cooling. This engineering information (EI) closure ends the need for further information from the field in regards to Service Engine Soon (SES) Lamp illuminated and/or “Service Emissions System” message on the Driver Information Center (DIC).
• 10224302Sep 28, 2022Equipment. This Preliminary information communicates an issue of the wrong part number WSS being installed during a service procedure and to warn dealership tech to make sure the correct part number WSS is installed.
• 10222839Sep 28, 2022Equipment. This service bulletin provides information on Handling Requests for Modifications to Permanently Import/Export Vehicles Between the U.S. and Canada.
• 10222832Sep 28, 2022Transmission and drivetrain. This informational bulletin explains how the trans slip or flare can be a normal condition.
• 10222841Sep 27, 2022Electrical system. This preliminary information (PI) provides information om Service Programming System (SPS) Error Codes (E4398, E4399, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491 or E6961).
• 10222824Sep 27, 2022Equipment, Body and structure. This informational bulletin provides technicians and dealership personnel with spray-in bed liner general information and repair procedures.
• 10222823Sep 27, 2022Engine cooling, Fuel system. This service bulletin provides information on availability of Diesel Fuel additives.
• 10222827Sep 26, 2022Body and structure, Electrical system. This informational bulletin provides information for dealers/technicians on Aero Shutter Related Diagnostic Codes.
• 10222807Sep 20, 2022Engine cooling. This bulletin provides diagnostic information when checking the exhaust system for leaks.
• 10222777Sep 16, 2022Transmission and drivetrain, Brakes, Engine cooling, Suspension, Steering. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
• 10222776Sep 16, 2022Electrical system. The intent of this service 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.
• 10222771Sep 16, 2022Engine cooling. This service bulletin provides information on Internal Engine Noise or Damage After Oil Filter Replacement.
• 10222770Sep 16, 2022Transmission and drivetrain, Engine cooling. This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
• 10222766Sep 16, 2022Engine cooling, Fuel system. This bulletin provides information on the TOP TIER Detergent Gasoline Licensed Brands and the TOP TIER Diesel Fuel Licensed Brands that are recommended for use in all GM vehicles and the TOP TIER FUELS website URL.
• 10224286Sep 14, 2022Fuel system. This Preliminary information communicates information that the EVAP purge pump may be filling with liquid fuel if the customer overfills the fuel tank by over 3 clicks of a normal filler nozzle. Reference N202324990: Special Coverage - Evaporative Emissions Purge Pump for repair information
• 10224285Sep 14, 2022Transmission and drivetrain. This Preliminary information communicates to the dealer technician that TAC recommends the utilization of the GDS2 software to aid in diagnosing automatic transmission concerns. TAC is requesting the GDS2 session logs be sent in before the dealer contacts TAC.
• 10222801Sep 14, 2022Suspension. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the front upper control arm ball joint separated from the socket.
• 10222796Sep 14, 2022Engine cooling. This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
• 10222780Sep 14, 2022Fuel system, Engine cooling. This service bulletin provides service information for customer concerns of an in-tank fuel pump whining noise, engine hard to start and/or stalls and Malfunction Indicator Lamp (MIL) is illuminated that may be caused by gelling of fuel in cold temperatures.
• 10222779Sep 14, 2022Engine cooling, Fuel system. This service bulletin provides a diagnostic aid procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.
• 10222778Sep 14, 2022Engine cooling, Fuel system. This informational bulletin provides information on Diesel Exhaust Fluid (DEF) and the proper use of the DEF system.
• 10222772Sep 14, 2022Engine cooling. This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
• 10222765Sep 14, 2022Fuel system, Engine cooling. This service bulletin provides the technician with additional information on fuels, fuel additives and fuel management.
• 10222733Sep 14, 2022Equipment. This service bulletin provides information on a guide to help reduce repeat visits for the same customer concern.
• 10222739Sep 13, 2022Engine cooling, Fuel system. This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
• 10222736Sep 13, 2022Fuel system. This service bulletin provides information on availability of Diesel Fuel additives.
• 10222734Sep 13, 2022Engine cooling. This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
• 10222732Sep 13, 2022Engine cooling. This service bulletin advises about the possible issues that may occur when using a scotch brite pad or highly abrasive disk on gasket sealing surfaces or reused parts.
• 10222782Sep 12, 2022Fuel system, Engine cooling. This informational bulletin explains why more DEF is being used in diesel engines due to new emission standards.
• 10222781Sep 12, 2022Engine cooling, Fuel system. This informational bulletin explains how to identify possible DEF contamination.
• 10222773Sep 12, 2022Fuel system, Engine cooling. This informational bulletin provides information on Clean Exhaust Filter See Owners Manual Now or Cleaning Exhaust Filter Keep Driving Until Message is Cleared messages Displayed on DIC, DTC P2463 May Be Set.
• 10222664Sep 9, 2022Engine cooling. This Informational bulletin advises the technician of a possible oil leak at the front cover and how to diagnose it to verify if it is coming from the seal or not.
• 10222660Sep 9, 2022Engine cooling. This informational bulletin provides a way for the technician to identify if the ECM has been modified.
• 10222658Sep 9, 2022Fuel system. This technical bulletin provides a procedure to flush the cooler lines to validate if there is excessive debris in the fuel system caused by a failed part.
• 10222650Sep 9, 2022Engine cooling. This bulletin provides information on Engine Concerns that could result from lack of scheduled maintenance, improper service or aftermarket calibrations.
• 10222649Sep 9, 2022Equipment. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only).
• 10222205Sep 9, 2022Engine cooling. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.

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