A very small number of 2023 Chevrolet Silverado 1500 and GMC Sierra 1500 with a 10-speed automatic transmission will have that transmission replaced, according to a new service bulletin sent out to GM dealers.

According to the notice sent to Chevrolet and GMC dealers, owners of affected pickups will start receiving notices this month (January 2023). The 10-speed transmissions in these vehicles have a case that is “out of specification.” Only 31 pickups have been identified with this issue.

The 10L80 10-speed automatic transmission as found in the Silverado and Sierra
The 10L80 10-speed automatic transmission as found in the Silverado and Sierra

The 10-speed automatic transmission by Chevrolet and GMC, introduced in 2019, represents a significant advancement in automotive transmission technology. Developed jointly by Ford and General Motors, it was first employed in high-performance vehicles before being adopted in trucks like the Chevrolet Silverado and GMC Sierra. This transmission is known for its smooth shifting, improved fuel efficiency, and the ability to keep the engine in its optimal power band. Its wide gear ratio spread allows for better acceleration and towing capabilities, making it a popular choice in both performance and utility vehicles.

Both “MHT” and “MHS” versions of the 10-speed are included in the replacement program, which are found paired to the L84 5.3L EcoTec3 V8 and L87 6.2L EcoTec3 V8 engines.

You will be notified by mail if your truck is involved in the transmission replacement program. The replacements will be covered under warranty and will cost you nothing. Loaner vehicles should be available while your truck is in for repair.

Owners and dealers will have until January 31st, 2026 to complete the transmission replacement. Vehicles that are a part of dealer inventory must have this replacement completed before a vehicle may be sold or used.

Dealers can reference “Customer Satisfaction Program: N232417460 Transmission Case out of Specification”