P0645low severityPowertrain
A/C Clutch Relay Control Circuit
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The PCM detected a fault in the air conditioning compressor clutch relay control circuit. This can prevent the A/C compressor from engaging properly.
Symptoms
- A/C not blowing cold
- A/C compressor won't engage
- Check engine light on
Common causes
- Faulty A/C clutch relay
- Wiring or connector damage
- Corroded relay contacts
- Failed PCM driver circuit
Diagnostic steps
- Scan for stored codes
- Inspect A/C clutch relay and connector
- Test relay coil and control circuit voltage
- Check PCM output signal
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