P0AE6Hybrid/EV Battery Precharge Contactor A Control 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
- P0AE6 means the control line of precharge contactor A is pulled too low, usually a short to ground. GM documents it in several programs. The 2016 and 2019 hybrid tables test the high-side driver while the contactor is commanded on and fail it below 5.35 V, 13 of 16 samples at 12.5 ms, Type B with two trips, enabled above 10.2 V system voltage. GM's 2013 eAssist battery controller uses a low-side driver and flags low voltage in the off state, which there points to a short to ground or an open circuit, 3 of 5 samples at 50 ms, Type B. CARB requires such circuit checks on hybrid outputs. Because the coil cannot pull in, precharge never starts; the positive main contactor equivalent is P0ADB.
- What you may notice
- Vehicle does not become ready to drive
- MIL and hybrid warning on
- Engine start or electric drive unavailable
- Likely causes
- LikelyControl wire chafed and shorted to ground
- PossiblePrecharge contactor coil shorted internally
- RareOpen circuit on low-side driven designs (GM eAssist)
- RareDriver stage in the battery controller defective
- 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.