2021 GMC Sierra 2500 Technical Service Bulletins

1,061 technical service bulletins (TSBs) are on record for the 2021 GMC Sierra 2500. 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.

• 10181660Sep 2, 2020Transmission and drivetrain. This informational bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
• 10179658Aug 27, 2020Engine. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
• 10180317Aug 14, 2020Tires. This Warranty Administration bulletin is for information on General Motors New Vehicle Tire Warranty Program (U.S. Dealers Only).
• 10180315Aug 12, 2020Electrical system. This bulletin provides information on the Transport Mode On Message Being Displayed in the Driver Information Center (DIC) and/or Battery Light is Flashing and the procedures to turn the Transport Mode message ON and OFF.
• 10180293Aug 10, 2020Transmission and drivetrain. 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.
• 10179625Aug 6, 2020Equipment, Engine. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
• 10178394Jul 29, 2020Electrical system. This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation
• 10179536Jul 13, 2020Engine cooling, Engine. This engineering informational bulletin is requesting information from technicians to inspect for engine oil leak and contact the engineer listed.
• 10178370Jul 13, 2020Engine cooling, Engine, Equipment. This Preliminary information communicates the use of air leak diagnostic test tool CH-52250 in addition to the information found in the service manual.
• 10175854Apr 30, 2020Equipment. This informational bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before sold (prepping) to the customer.
• 10175762Apr 7, 2020Electrical system, Engine. This technical bulletin provides a procedure to check the oil level for correct reading and oil pressure switch is in working order.

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