P0CEA: Hybrid/EV Electronics Coolant Pump A Performance
What to do
As P0C31 — check the electronics coolant level first; it is a separate reservoir from the engine's and easy to overlook, and if there has been recent coolant work, have the circuit properly bled. Expect slower charging while it is unfixed.
What this code means
Electronics coolant pump A is being commanded correctly and is not achieving what was asked of it.
The outcome-versus-circuit distinction is at P0C73. The suspects here are hydraulic rather than electrical — air trapped after a repair, which is the commonest and needs bleeding rather than a part; low coolant; a worn impeller; or a restriction downstream. A pump can turn at exactly the commanded speed and move nothing at all, and no electrical test will show it.
Likely causes
Start here
- Faulty inverter coolant pump · moderate
- Air trapped in the inverter cooling circuit · moderate
- Low inverter coolant level · easy
Less common
- Corroded or loose connector · easy
- Open circuit in pump wiring · 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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