Service campaign N242480630

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

General Motors has decided that a defect which relates to motor vehicle safety may exist in certain: 2019 – 2020 model year Cadillac CT6, 2020 – 2021 model year Cadillac CT4 and CT5, and 2020 – 2022 model year Chevrolet Camaro vehicles equipped with a 10-speed transmission. A transmission control valve in some of these vehicles may be susceptible to excess wear over time, resulting in a gradual loss of pressure within the valve that can cause harsh shifting. In rare cases, the wheels may experience a momentary lock up. If the wheels lock-up momentarily while driving, there is increased risk of a crash. Dealers will install new transmission control module software that will monitor valve performance and detect excess wear approximately 10,000 miles (16,000 km) before a wheel lock up condition could occur. Once detected, the transmission will be limited to fifth gear, preventing the possibility of a wheel lock up condition, which occurs in a downshift from eighth gear. A service engine light and reduced propulsion message will also display in the instrument panel.

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Listing a model year does not mean every vehicle of it is concerned: the document says which.

• Bulletins for another vehicle
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