P0885high severityPowertrain
TCM Power Relay Control Circuit/Open
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The control circuit for the TCM power relay is open or not functioning. The TCM cannot properly command its power relay.
Symptoms
- Transmission does not shift
- Warning light on
- No power to transmission control system
Common causes
- Faulty TCM power relay
- Open in relay control wiring
- Corroded relay socket
- Faulty transmission control module
Diagnostic steps
- Test the TCM power relay operation
- Check control circuit continuity
- Inspect relay socket and connectors
- Repair open wiring or replace relay
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