P0CA4Hybrid/EV Battery Charging Voltage High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0CA4 is stored when the traction battery voltage climbs above its permitted limit while energy flows into the pack, for instance because a charger or the drive keeps pushing current although the cells are already full. Audi lists the code in TSB 2062631/5 from 2024 for the e-tron and Q8 e-tron family, there stored by the high-voltage charger module J1050 and described as an excessive battery load voltage. In that case it is one of several ghost entries produced by charger software, found without any customer complaint, and the bulletin says it can be ignored. CARB section (e)(15.2.3) requires monitoring of the energy storage system and of the onboard charger of plug-in vehicles. A real overvoltage normally appears together with cell codes such as P0DE7, and charging is then interrupted.
- What you may notice
- Charging stops early or does not start
- Code found during a check without any noticeable symptom
- Likely causes
- LikelyCharger or battery control software storing a false entry (Audi 2062631/5)
- PossibleCharging current not reduced in time as the pack approaches full charge
- RareFaulty pack or cell voltage measurement in the battery management
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.