General Motors Trucks, SUVs Facing National Backorder on Transmission Valve Bodies

A national backorder on transmission valve bodies is causing delays in necessary repairs for GM trucks and SUVs, reports GM Authority.

On Nov. 26, 2024, GM said it would be offering Special Coverage for vehicles impacted by momentary rear-wheel lock-up from control valve failure, potentially caused by a miscommunication between the transmission and the transmission control module software.

Beginning with model year 2019 and later, the following models are impacted by the issue:

Chevy Silverado 1500
Chevy Suburban
Chevy Tahoe
GMC Sierra 1500
GMC Yukon
GMC Yukon XL
Cadillac Escalade
Cadillac Escalade ESV

Any unit containing a GM eight-speed automatic transmission or GM 10-speed automatic transmission may be affected. GM Authority noted that the issue may also potentially be present in all ICE-powered full-size GM truck and SUV models, including diesel and gasoline variants.

GM’s Special Coverage included transmission control valve body repairs, but many repairs have yet to be carried out due to a national backorder on transmission control valves. Owners have been estimated wait times ranging from six weeks to over seven months, with one owner even being told it would be a year before a dealership could get the part.

In response, many dealerships have resorted to performing full transmission replacements. This led one owner to finally receiving a repair, after seven months, after GM approved a replacement transmission.