P0AE0Hybrid/EV Battery Negative Contactor Control 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
- P0AE0 is stored when the negative contactor drive circuit shows too high a voltage for its state, which mostly means a short to battery voltage. GM's 2016-19 hybrid tables set it with the contactor commanded off and the driver output between 5.27 and 19.7 V for 40 of 50 samples at 12.5 ms, Type B, two trips. CARB 1968.2 requires hybrid output components to be monitored for such circuit faults. Siblings are P0ADD (open) and P0ADF (low); the positive side equivalent is P0ADC. A coil energized by a short could keep the contactor closed, so a stuck-closed code P0AA4 may follow. The controller usually disables the high-voltage system.
- What you may notice
- Hybrid or EV warning light
- High-voltage system disabled, vehicle not ready
- Possible additional stuck-closed code
- Likely causes
- LikelyCoil control wire shorted to 12 V
- PossibleDamaged harness or connector at the battery disconnect unit
- RareDriver stage in the battery controller shorted
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.