P0AC3Hybrid/EV Battery Pack Current Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0AC3 describes a battery current signal that jumps, spikes or drops out in a way real current flow could not explain, typically through a loose connector, a chafed signal wire or interference on the sensor ground. No manufacturer documents this exact code publicly. GM monitors the same Hall-effect sensor with the stuck check P0ABF, the offset check P0AC0 and the range limits P0AC1 and P0AC2, and CARB requires circuit and rationality monitoring for battery inputs that influence emissions. As the fault is not permanent, the code may be the only trace; during the dropouts the controller may still cut battery power or turn on a warning light.
- What you may notice
- Warning light that comes and goes
- Short drops in electric power while driving
- Likely causes
- LikelyLoose or corroded current sensor connector
- PossibleChafed signal or supply wire with intermittent contact
- RareInterference on sensor ground or shield
- 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: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.