General Motors has issued a technical service bulletin (TSB) for the 2021 Buick Encore GX crossover equipped with the optional nine-speed automatic transmission over an issue related to the transmission clutch spring retaining ring. This problem is similar to the issue seen in other GM crossovers like the Chevy Blazer, Equinox and GMC Terrain, for which GM also issued a TSB earlier this week.
The problem: on affected vehicles, the transmission clutch spring retaining ring may not be fully seated. In vehicles with this condition, a warning light indicating a transmission malfunction will appear on the gauge cluster, alerting the driver of the issue. This warning light will appear when the vehicle still shows low mileage on the odometer.
The hazards: GM’s bulletin does not say what problems the transmission clutch spring retaining ring issue may lead to, although as noted above, the problem will produce a malfunction indicator warning light on the gauge cluster. This problem will also produce a diagnostic trouble code (or DTC) of P0747.
If the TSB applies to any vehicles in a dealer’s inventory, dealers are instructed not to sell any vehicles that do not pass the inspection procedure outlined in the TSB document.
The fix: dealers will be instructed to inspect and replace the transmission clutch spring retaining ring in affected vehicles.
Affected component: transmission clutch spring retaining ring.
- 2021 Buick Encore GX equipped with 9T4X nine-speed automatic transmission
- GM TSB number: A202321842
- Buick customer service: 1-877-248-2080