P0CE2: Hybrid/EV Battery Pack Coolant Control Valve A Control Circuit Low
What to do
A stuck valve redirects cooling rather than stopping it, so the symptom often appears somewhere unrelated — the pack derating, the cabin not heating, or charging slowing down. Mention anything else that has changed, because it helps establish which way the valve is stuck.
What this code means
The coolant control valve's control circuit is reading low — a short to earth, or a driver output that has failed on. The valve's role and why a stuck position redirects rather than stops cooling are at P0CDF.
Likely causes
Start here
- Faulty battery pack coolant control valve · moderate
- Corroded or loose connector · easy
Less common
- Low coolant level · easy
- Debris or corrosion seizing the valve · moderate
- 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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