P0AC2Hybrid/EV Battery Pack Current Sensor A Circuit 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
- With P0AC2 the current sensor output sits above its valid window, which after conversion would mean an implausibly large current in the opposite direction to P0AC1. GM's 2016 and 2019 hybrid tables set it when the Hall-effect sensor reads above 274.6 A in 8 of 10 samples taken every 25 ms, again as Type A with immediate MIL. The 2013 table for an earlier pack uses an output above 4.65 V, roughly 215 A, with 7 of 10 samples and Type B. A signal shorted to the 5 V supply or an open sensor ground are common reasons. Because the controller can no longer count charge, it caps battery power; the low limit is P0AC1 and implausible offsets are P0AC0.
- What you may notice
- Hybrid system or check engine warning on
- Battery power limited, engine runs more often
- Likely causes
- LikelySensor ground open
- PossibleSignal wire shorted to the 5 V supply or another voltage
- 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.