P0886high severityPowertrain
TCM Power Relay Control Circuit Low
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The TCM power relay control circuit voltage is too low. This suggests a short to ground or wiring fault in the relay control line.
Symptoms
- Transmission stays in limp mode
- Warning light illuminated
- Delayed or no engagement
Common causes
- Short to ground in control wiring
- Faulty TCM power relay
- Corroded connectors
- Faulty transmission control module
Diagnostic steps
- Check control circuit for short to ground
- Test the power relay
- Inspect wiring and connectors
- Repair shorted wiring or replace relay
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