P0563System Voltage High
- Generic OBD-II code · Powertrain
- How the car detects it
- The module measures its own supply voltage. CARB allows other monitors to be suspended below 11 V, and above a maker's threshold only if the voltage itself is diagnosed – that is what these codes record. GM's engine modules and Ford's PCM set them without warning lamp. P0563 means the voltage is above its threshold: GM's engine module 18 V or more in 400 of 500 samples, type C; Saab's 9-4X above 18 V for 5 s. Typical are an overcharging regulator or a jump start or charger at 24 V. Saab's EDC16 diesel reports the same condition as P0560 instead.
- What you may notice
- Charge warning
- Bulbs burning out, flickering lights
- Several modules switch off or report faults
- Likely causes
- LikelyRegulator or alternator overcharging
- Possible24 V jump start or fast charger
- PossibleMissing battery or poor battery terminal (voltage spikes)
- RareAlternator control line from the module (smart charging)
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.