OBD-II code · Powertrain (generic)
P0E66 Battery Charger Control Circuit Low
The battery charger control circuit reports a control circuit low condition. The on-board charger negotiates voltage, current and safety with the EVSE; a fault interrupts charging or limits it to AC slow-charge despite a DC fast charger being attached.
Is it safe to drive with P0E66?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWire shorted to ground
- PossibleModule input short
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Battery Charger Control Circuit, Wiring Harness, Bms
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.