P0E6CBattery Charging System Precharge Contactor Circuit Stuck Open
- Generic OBD-II code · Powertrain
- How the car detects it
- P0E6C reports that the precharge contactor of the charging system does not close, or that no current flows through the precharge branch, even though the command was given. The charger side then cannot be brought up to pack voltage, the main charging contactors stay open and the session ends before any energy flows. No manufacturer documents P0E6C publicly. GM's 2019 hybrid tables show the measurable symptom under other codes: if the charger bus is still outside 95 to 105 percent of pack voltage after 0.7 seconds, P0D26 is set, and if charger voltage stays under 10 V once a precharge attempt has failed, GM blames the positive charging contactor with P0D09, both Type A. CARB counts such charging failures among the faults a plug-in hybrid must detect. A welded contactor is P0E6B instead.
- What you may notice
- Charging stops a few seconds after plugging in
- Repeated clicking from the battery area at charge start
- Likely causes
- LikelyOpen precharge resistor interrupting the branch
- PossibleBurnt or contaminated contactor contacts not conducting
- PossibleContactor coil not pulling in due to low supply
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.