P0C49: Hybrid/EV Battery Pack Coolant Pump A Control Circuit High
What to do
As P0C47 — expect slower charging and reduced power in warm weather until it is fixed. Ask for the supply to be checked before the pump is condemned; they produce identical symptoms and one is far cheaper.
What this code means
The pack coolant pump's control circuit is reading high — a short to a live circuit, or an open the module reads as an undriven output. The family's argument is at P0C47.
Likely causes
Start here
- Faulty electric coolant pump · moderate
- Corroded or loose connector · easy
- Air trapped in the inverter cooling circuit · moderate
Less common
- Low coolant level · 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
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
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.
Sign in or create an account to add what you found about P0C49.