P1671low severityPowertrain
MIL Control Circuit
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The PCM has detected a fault in the malfunction indicator lamp (check engine light) control circuit. The warning lamp may not operate correctly.
Symptoms
- Check engine light stays off
- Check engine light stays on
- No warning lamp response
Common causes
- Faulty MIL bulb or LED
- Wiring open or short in MIL circuit
- Bad instrument cluster
- Failed PCM driver
Diagnostic steps
- Verify MIL operation at key-on
- Inspect MIL circuit wiring and connectors
- Test bulb/LED and cluster continuity
- Check PCM output and repair as needed
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