P1625high severityPowertrain
PCM System Reset
on 2016 Chevrolet Spark EV Electric Motor · FWD
What this code means
The PCM has experienced an unexpected reset during operation. This can indicate a power supply issue or internal PCM fault.
Symptoms
- Check Engine Light
- Engine momentary stumble
- Loss of adaptive data
- Multiple codes may be stored
Common causes
- Intermittent power supply to PCM
- Loose PCM connector
- Internal PCM failure
- Low battery voltage
- Ignition switch issue
Diagnostic steps
- Check all PCM power and ground circuits
- Inspect PCM connectors
- Test battery and charging system
- Monitor PCM power with oscilloscope for dropouts
- Check ignition switch
Repair notes
Check PCM power and ground connections. Verify battery and charging system. Replace PCM if internal fault confirmed.
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