P0E66Battery Charger Control Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- With P0E66 the controller finds the charger command line pulled lower than the state it is driving, which typically means the wire touches ground somewhere between the control unit and the on-board charger. If the command is active-high, the charger simply never receives it; a grounded line can also overload the output stage that drives it. No manufacturer documents P0E66 publicly. GM's Volt and 2019 hybrid tables check this line only through the general code P0E65, based on a hardware fault flag sampled every 25 ms at 10.2 V or more. California's OBD rule requires plug-in hybrids to recognise charger faults that stop or limit charging. P0E67 is the opposite case, a line stuck high; P0E68 covers a line that is electrically sound but answers wrongly.
- What you may notice
- Charging does not start after plugging in
- Charge indicator shows a fault or goes out
- Likely causes
- LikelyControl wire chafed through to body ground
- PossibleMoisture in a connector bridging the signal to ground
- RareInternal short in the charger's command input
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.