2020 GMC Sierra Denali Technical Service Bulletins

359 technical service bulletins (TSBs) are on record for the 2020 GMC Sierra Denali. 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.

• 10215770Feb 1, 2022Other or unknown. Information.
• 10214204Jan 11, 2022Equipment, Engine cooling. This informational bulletin explains how the regen works for the DEF system and how it works at different levels.
• 10206726Dec 14, 2021Engine cooling. This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
• 10190433Mar 30, 2021Engine cooling. This Preliminary Information communication provides information to the technician about vehicles that have run hot and or has a tick noise. Technician should inspect the head gaskets to ensure are not installed backwards. Technician should replace the head gasket if they are found installed backwards.
• 10190767Mar 5, 2021Back-over prevention (rear camera). Service Update. certain vehicles may have a damaged NOx sensor connector. Dealers are to replace the nitrogen oxides sensor ? position 2.
• 10190358Mar 4, 2021Body and structure. This Preliminary information communicates to the dealer technician that the 10L1000 transmission and valve body assembly part restriction has ended. Dealers are advised that these transmissions and valve bodies can now be ordered through the regular GM CCA parts process or PQC process for required dealers (Canada).
• 10184105Nov 11, 2020Tires, Wheels. This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized, tested and designed for the vehicle in question and its applications. Technician should not use the information that is provided by the antilock braking system tire size selection.
• 10181157Sep 21, 2020Equipment. This Preliminary information communicates information on radio software anamolies and future radio software updates to correct the concern.
• 10181645Sep 1, 2020Fuel system. Customer Satisfaction Program. Certain vehicles may not have one of the fill pipe parts kit which should be included with the vehicle. Dealers are to provide the missing fill pipe parts kit to the customer.

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