GM addresses transmission issue in 2025-2026 Equinox and Terrain models

General Motors has issued a preliminary service bulletin, PIP6100, addressing certain 2025–2026 model year Chevrolet Equinox and GMC Terrain crossovers in North America. This applies specifically to versions equipped with GM's eight-speed automatic transmission, designated RPO MGH. Models with a CVT or front-wheel drive are not affected by this document.

According to the manufacturer, some owners have reported that the vehicle may get stuck in first gear. In these cases, engine revs increase, but the transmission fails to shift up. This situation can occur after moving the selector from Reverse to Drive when the transmission temperature is below 20 degrees Celsius. No diagnostic trouble codes are recorded during this event.

GM engineers are investigating the behavior of the 8T45 transmission under these conditions. They suspect that in cold weather, following a recent shift from reverse and with light throttle application, the system might misinterpret the status of a clutch component, preventing a shift to second gear.

Dealers have been instructed not to replace any parts until a final resolution is reached. As a temporary measure, drivers are advised to briefly release the accelerator pedal—this allows the transmission to engage second gear and resume normal operation. If the issue is confirmed and a fix is developed, the preliminary bulletin will be replaced with a full technical service document.