General Motors has issued a technical service bulletin (TSB) for certain examples of the 2020 and 2021 model-year Cadillac XT4 subcompact luxury crossover for a problem related to the clutch spring retaining ring in the nine-speed automatic transmission that comes standard in the vehicle.
The problem: in affected vehicles, the clutch spring retaining ring may not be fully seated. Vehicles with this problem will produce a warning light on the gauge cluster/instrument panel indicating a transmission malfunction, alerting the driver of the issue. This warning light will appear when the vehicle still shows low mileage on the odometer.
A TSB has also been issued for a similar problem in other GM crossovers equipped with the nine-speed automatic transmission, including the Chevrolet Trailblazer, Blazer and Equinox, Buick Encore GX and GMC Terrain.
The hazards: GM’s service bulletin for this issue does not indicate what problems an unseated transmission clutch spring retaining ring may lead to. However, as noted above, the problem will produce a malfunction indicator warning light on the gauge cluster/instrument panel. Additionally, this problem will produce a diagnostic trouble code (or DTC) of P0747.
The fix: Cadillac dealers will be instructed to inspect the transmission clutch spring retaining ring in affected vehicles. GM’s TSB indicates this particular service update “involves vehicles in dealer inventory only and will expire on February 28, 2022.”
Affected component: transmission clutch spring retaining ring.
- General Motors TSB number: A202321843
- Cadillac customer service number: 1-877-248-2080