P0563high severityPowertrain
System Voltage High
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The system voltage is above the acceptable threshold.
Symptoms
- Check Engine Light
- Bulbs burning out frequently
- Battery swelling
- Electrical component damage
Common causes
- Faulty voltage regulator
- Faulty alternator
- Bad battery sense wire
- PCM-controlled charging issue
Diagnostic steps
- Test voltage at battery (should not exceed 15V)
- Test alternator regulator
- Check battery sense wire
- Test charging system
Repair notes
Overcharging can damage battery and electronics. Replace alternator/regulator. Urgent repair.
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