P0AE7Hybrid/EV Battery Precharge Contactor A 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
- P0AE7 is stored when the control line of precharge contactor A carries too much voltage for its commanded state, typically a short to the 12 V supply. In GM's 2016 and 2019 hybrid tables the high-side driver output reads between 5.27 and 19.7 V while the contactor is commanded off, 40 of 50 samples at 12.5 ms, Type B, two trips. GM's 2013 eAssist controller looks for a short to power on its low-side driver in the on state, 3 of 5 samples at 50 ms, Type B. A coil energized by a short may keep the precharge path closed when it should be open, so P0AE2 can follow. CARB requires circuit monitoring of such hybrid outputs. The negative and positive main contactor counterparts are P0AE0 and P0ADC.
- What you may notice
- Vehicle may not start or become ready
- MIL and hybrid warning on
- Possible additional stuck-closed code P0AE2
- Likely causes
- LikelyControl wire shorted to 12 V supply
- PossibleDriver stage stuck on in the battery controller
- RareOutdated battery controller calibration
- 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.