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.
Affected components
- Alternator
- Voltage regulator
Common causes
- High likelihood: Voltage regulator failed
- Medium likelihood: Alternator overcharging
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.