19:53 20-11-2025

GM bulletin: Corvette E-Ray 'Service Transmission' warning fixed by pan filter replacement (P1955/P0867)

GM links Corvette E-Ray 'Service Transmission' warning to a clogged pan filter causing DCT pump cavitation (codes P1955/P0867). Bulletin: replace pan filter.

Owners of 2024–2026 Corvette E-Ray hybrids are encountering a Service Transmission warning, often accompanied by the Check Engine light. GM has determined the issue stems from the dual-clutch system: cavitation of the auxiliary pump caused by a clogged transmission pan filter.

This disruption to fluid flow can trigger fault codes P1955 and P0867 in the transmission control module. To avoid costly repairs, GM has issued a service bulletin instructing technicians to replace the transmission pan filter and then run diagnostics again.

The procedure demands precise execution: technicians must install a new set of 15 single-use bolts and tighten them strictly in the specified sequence. The company also emphasizes that no other repair methods should be used to address these codes. Prompt filter replacement returns the car to normal operation.

For a cutting-edge hybrid like the E-Ray, a clear, contained fix is reassuring—and a reminder that even sophisticated drivetrains rely on clean filtration and steady fluid supply.