P063AGenerator Voltage Sense Circuit A
- Generic OBD-II code · Powertrain
- How the car detects it
- Some charging systems measure the actual battery or alternator voltage through a separate sense line (regulator terminal S or an input of the module) to compensate voltage drops in the charging cable; without it the system reports a charging fault. No manufacturer document available to us uses P063A–P063D, so these descriptions follow the circuit principle and CARB, under which a charging-system input needs the check engine light only if it affects emissions or other diagnostics. P063A is the general or open-circuit code of sense circuit A; range, low and high are P063B–P063D. It differs from the F feedback (P0622/P0625/P0626) and the L line (P0621); the module's own supply voltage is monitored as P0560–P0563.
- What you may notice
- Battery warning lamp on
- Charging voltage too high or too low (flat or overcharged battery)
- Flickering lights
- Further voltage codes (P0562/P0563)
- Likely causes
- LikelySense wire, fuse or connector between battery and alternator or module open or corroded
- PossibleAlternator or regulator faulty
- PossibleContact resistance at battery terminals or grounds
- RareBattery faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.