OBD-II code · Powertrain (generic)
P0563 System Voltage High
Battery / charging system voltage seen by the ECU exceeds the upper threshold (typically around 16 V). Caused by a failing voltage regulator inside the alternator. Sustained over-voltage can damage other electronics.
Is it safe to drive with P0563?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyVoltage regulator failed
- PossibleAlternator overcharging
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Alternator, Voltage Regulator
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.