P0AC1Hybrid/EV Battery Pack Current Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0AC1 is set when the output of the pack current sensor falls below the valid window, so that the converted current would be an impossible discharge or charge value. GM documents it in several hybrid tables. In the 2016 and 2019 versions the Hall-effect sensor fails when the result is below -365.1 A for 8 of 10 samples at 25 ms with system voltage above 10.2 V; the code is Type A with MIL on the first trip. An earlier GM pack in the 2013 table uses an output below 0.2 V, equal to about -230 A, with 7 of 10 samples and Type B. Typical causes are a lost supply or a signal shorted to ground. P0AC2 is the high side and P0AC0 the plausibility check.
- What you may notice
- Hybrid system or check engine warning on
- Electric drive limited or vehicle will not go ready
- Likely causes
- LikelySensor 5 V supply open or shorted
- PossibleSignal wire shorted to ground
- PossibleHall current sensor failed internally
- 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.