DCT Transmission Auxiliary Pump Cavitation
Some 2024-2026 Corvette E-Ray models may have a Service Transmission message displayed on the Driver Information Center along with an illuminated Check Engine MIL. DTCs P1955 (Transmission Fluid Pressure Relief Valve Performance) and P0867 (Transmission Fluid Pressure Performance) may be set in the Transmission Control Module (TCM).

These conditions may be caused by auxiliary pump cavitations due to the transmission pan fluid filter.
If DTCs P1955 and/or P0867 are set as current or history DTCs, replace the transmission pan fluid filter and reevaluate the vehicle.
Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement in the appropriate Service Information.

Do not attempt any other repairs for these DTCs other than transmission fluid pan filter replacement.

TIP:
When removing the transmission fluid pan, the 15 bolts are single-use fasteners.
During installation, tighten the bolts in sequence according to the Service Information using the GM-45059-A Angle Meter.

For more information, including part numbers, refer to Bulletin #25-NA-278.