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.

• 10187747Jan 22, 2021Equipment, Fuel system. This informational bulletin advises the tech of a possible normal condition when the vehicle creeps forward during start up conditions when the clutch packs are full of residual oil.
• 10187745Jan 22, 2021Engine. This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and prevent unnecessary engine replacement.
• 10187769Jan 21, 2021Electrical system, Engine cooling. This bulletin provides a possible location of a bad connection at the reductant fluid tanks electrical connector.
• 10188419Jan 20, 2021Equipment, Electrical system. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Loss of Power, Instrument Panel Cluster (IPC) Gauges are Inoperative and/or Fluctuate, Multiple Warning Lights on DIC.
• 10187770Jan 20, 2021Electrical system, Engine cooling. This technical bulletin provides a procedure to program the reductant fluid module if found the cause of the customers concern.
• 10187763Jan 15, 2021Equipment, Engine cooling. This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
• 10187767Jan 13, 2021Fuel system, Engine cooling, Equipment. This informational bulletin provides a test procedure, for a possible faulty DEF Heater.
• 10188415Jan 12, 2021Equipment, Electrical system. This engineering information (EI is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to USB Port Does Not Charge or Recognize Phone/Device, or Not Holding Cable in Port, USB and/or Auxiliary Port Inoperative or Won?t Play Media From the Device Constantly or Intermittently, Apple CarPlay and/or Android Auto Inoperative When Connecting into the USB…
• 10188418Jan 11, 2021Equipment, Electrical system, Engine cooling. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a noise heard from the engine compartment, loss of charging and/or reduced alternator output.
• 10187759Jan 11, 2021Transmission and drivetrain, Engine cooling. This Technical bulletin provides a repair to correct a condition of Shudder/Surging While Driving.
• 10187757Jan 11, 2021Fuel system, Equipment. This informational bulletin advises the technician on what to do if the DEF pump has been replaced and perform a leak test to prime the pump.
• 10187379Dec 23, 2020Equipment. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA).
• 10186065Dec 23, 2020Equipment. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA).
• 10187736Dec 22, 2020Engine, Electrical system. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service Engine Soon Lamp being illuminated.
• 10187409Dec 22, 2020Body 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.
• 10187389Dec 22, 2020Body and structure. This technical bulletin provides repair information to correct a customer concern of the pickup box being out of alignment.
• 10187200Dec 22, 2020Lane departure. This Preliminary information communicates an issue with the engine wiring harness shorting at the left front cylinder head causing any of the following issues: - IPC gauges sweeping while driving - Several IPC warning messages and MIL displayed - Any combination of the following DTC's: U0073 U0100 U0101 U0121 U0128 U0129 U0131 U0140 U0146 U0422 U2413 P0107 P0117 P0119 P0641 C2A07
• 10186115Dec 22, 2020Engine, Electrical system. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service Engine Soon Lamp being illuminated.
• 10186082Dec 22, 2020Body 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.
• 10186075Dec 22, 2020Body and structure, Equipment. This technical bulletin provides repair information to correct a customer concern of the pickup box being out of alignment.
• 10185749Dec 22, 2020Lane departure. This Preliminary information communicates an issue with the engine wiring harness shorting at the left front cylinder head causing any of the following issues: - IPC gauges sweeping while driving - Several IPC warning messages and MIL displayed - Any combination of the following DTC's: U0073 U0100 U0101 U0121 U0128 U0129 U0131 U0140 U0146 U0422 U2413 P0107 P0117 P0119 P0641 C2A07
• 10187622Dec 21, 2020Equipment, Seat belts. Service Update - Certain 2020 model year Chevrolet Silverado 1500/2500 and GMC Sierra 1500/2500 vehicles may have a condition where the driver side front outboard seat belt may not retract due to a broken rewind spring. If the seat belt is loose, the effectiveness of the restraints may be reduced. The retractor will still pretension and lock during a crash. Replace the seat belt retractor.
• 10187369Dec 21, 2020Seat belts. Service Update - Certain 2020 model year Chevrolet Silverado 1500/2500 and GMC Sierra 1500/2500 vehicles may have a condition where the driver side front outboard seat belt may not retract due to a broken rewind spring. If the seat belt is loose, the effectiveness of the restraints may be reduced. The retractor will still pretension and lock during a crash. Replace the seat belt retractor.
• 10187217Dec 21, 2020Seat belts, Air bags. Service Update - Certain 2020 model year Chevrolet Silverado 1500/2500 and GMC Sierra 1500/2500 vehicles may have a condition where the driver side front outboard seat belt may not retract due to a broken rewind spring. If the seat belt is loose, the effectiveness of the restraints may be reduced. The retractor will still pretension and lock during a crash. Replace the seat belt retractor.
• 10186055Dec 21, 2020Equipment, Seat belts. Service Update - Certain 2020 model year Chevrolet Silverado 1500/2500 and GMC Sierra 1500/2500 vehicles may have a condition where the driver side front outboard seat belt may not retract due to a broken rewind spring. If the seat belt is loose, the effectiveness of the restraints may be reduced. The retractor will still pretension and lock during a crash. Replace the seat belt retractor.
• 10187413Dec 18, 2020Engine cooling, Equipment. This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
• 10186086Dec 18, 2020Engine cooling. This technical bulletin provides repair information to correct a customer concern of Possible Crank No Start or Extended Crank with DTC P12A6.
• 10187731Dec 17, 2020Engine, Electrical system. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a Slow Start and/or No Start, Battery Message Indicated, having to jump start on more then one occasion.
• 10187619Dec 17, 2020Equipment, Steering. Service Update. A small number of vehicles may have been built with a cracked steering gear ballnut which could result in noise and reduction of steering performance. Dealers are to replace the steering gear.
• 10187428Dec 17, 2020Equipment. This service bulletin provides information to aid a dealer/customer concern of Radio Unwanted Phantom Touch or Non-Responsive to Touch After Cleaning/Disinfecting Radio Display.
• 10187346Dec 17, 2020Steering. Service Update. A small number of vehicles may have been built with a cracked steering gear ballnut which could result in noise and reduction of steering performance. Dealers are to replace the steering gear.
• 10187214Dec 17, 2020Steering, Back-over prevention (rear camera). Service Update. A small number of vehicles may have been built with a cracked steering gear ballnut which could result in noise and reduction of steering performance. Dealers are to replace the steering gear.
• 10186110Dec 17, 2020Engine, Equipment, Electrical system. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to a Slow Start and/or No Start, Battery Message Indicated, having to jump start on more then one occasion.
• 10186101Dec 17, 2020Equipment. This service bulletin provides information to aid a dealer/customer concern of Radio Unwanted Phantom Touch or Non-Responsive to Touch After Cleaning/Disinfecting Radio Display.
• 10186052Dec 17, 2020Steering. Service Update. A small number of vehicles may have been built with a cracked steering gear ballnut which could result in noise and reduction of steering performance. Dealers are to replace the steering gear.
• 10187625Dec 16, 2020Engine cooling, Equipment. This informational bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
• 10187618Dec 16, 2020Equipment, Engine cooling. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin.
• 10187387Dec 16, 2020Engine cooling. This technical bulletin provides a service procedure to correct a condition of Ticking Noise from the Engine.
• 10187345Dec 16, 2020Engine cooling. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin.
• 10187213Dec 16, 2020Engine, Equipment. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin.
• 10187190Dec 16, 2020Transmission and drivetrain, Body and structure. This Preliminary information communicates to the dealer technician to replace the valve body on the 8L90 transmission setting DTC P0796 if no debris is found in the transmission fluid pan. If debris is found in the transmission fluid pan the technician is advised to repair the transmission as need and replace the valve body.
• 10187189Dec 16, 2020Electrical system. This Preliminary information communicates and issue with the SES MIL on setting DTC's P0201/P0202/P0203/P0204/P0205/P0206/P0216 and instructing dealership to inspect the engine wiring harness for damage.
• 10186104Dec 16, 2020Engine cooling, Equipment. This informational bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
• 10186073Dec 16, 2020Equipment, Engine cooling. This technical bulletin provides a service procedure to correct a condition of Ticking Noise from the Engine.
• 10186051Dec 16, 2020Equipment, Engine cooling. Service Update. Certain vehicles may present a broken engine valve spring. This may cause the engine to run rough, an engine knocking or ticking noise, a check engine light illumination, or a possible vehicle stall. Dealers are to perform the inspection procedure contained within this bulletin.
• 10185739Dec 16, 2020Body and structure, Transmission and drivetrain. This Preliminary information communicates to the dealer technician to replace the valve body on the 8L90 transmission setting DTC P0796 if no debris is found in the transmission fluid pan. If debris is found in the transmission fluid pan the technician is advised to repair the transmission as need and replace the valve body.
• 10185738Dec 16, 2020Electrical system. This Preliminary information communicates and issue with the SES MIL on setting DTC's P0201/P0202/P0203/P0204/P0205/P0206/P0216 and instructing dealership to inspect the engine wiring harness for damage.
• 10187183Dec 14, 2020Electrical system, Back-over prevention (rear camera). 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.
• 10185732Dec 14, 2020Electrical system, Back-over prevention (rear camera). 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.
• 10187375Dec 11, 2020Engine cooling. This technical bulletin provides a procedure to measure vibration and install engine mounts to correct a Rough Idle in Drive concern.

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