P0DFF
Battery Charger Coolant Control Valve Control Circuit High
Voltage on the battery charger coolant control valve control line is above the expected window. 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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Common causes
Ordered by how often each turns out to be the cause.
- Wire shorted to B+Common
- Coil openPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Battery Charger Coolant Valve
- Wiring Harness
P0DFF is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.