P0AC0Hybrid/EV Battery Pack Current Sensor A Circuit Range/Performance
- 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
- P0AC0 belongs to the battery current sensor family, not to battery cooling. It reports a sensor whose reading is electrically valid but implausible. GM's 2011 to 2013 hybrid tables describe the check: with the contactors open, when no current can flow, the reading in each of the sensor's high, mid and low ranges must stay within 5 A of zero, and the controller also checks that the measured current fits the change in pack voltage. A failure sets the code as one-trip Type A in the 2013 table. The check waits while circuit codes P0AC1 or P0AC2 are active. Effects are a drifting charge estimate, reduced hybrid power and, in severe cases, a vehicle that will not go ready.
- What you may notice
- Hybrid system or check engine warning on
- State of charge display drifts or jumps
- Reduced electric assist
- Likely causes
- LikelyCurrent sensor zero offset drifted
- PossibleUnstable sensor supply or reference voltage
- RareBattery controller input fault
- 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: €200 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.