P0D1C: Hybrid/EV Battery Pack Coolant Control Valve B Stuck On
What to do
As P0CE1 — in cold weather this is the one to attend to, because a pack that never warms up looks like a failing battery and is not.
What this code means
The second coolant control valve has stuck in its on position. As at P0CE1, the case worth naming is cold weather: a valve stuck open can carry the pack's heat away as fast as it is made, leaving a battery that never warms up — reduced power, weak regenerative braking and rapid charging refused, on a car whose cooling is technically working perfectly.
Likely causes
Start here
- Faulty battery pack coolant control valve · moderate
- Corroded or loose connector · easy
Less common
- Debris or corrosion seizing the valve · moderate
- Low coolant level · easy
- Damaged wiring harness · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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