P0D1D
Hybrid/EV Battery Pack Coolant Control Valve B Control Circuit Low
The HV battery pack coolant control valve B reports a control circuit low condition. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Common causes
Ordered by how often each turns out to be the cause.
- Wire shorted to groundCommon
- Coil internal shortPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Hv Battery Pack Coolant Valve B
- Wiring Harness
- Bms
P0D1D 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.