P0C7C: Hybrid/EV Battery Temperature Sensor G Circuit
What to do
As P0BC2 — the reading governs what the car allows the battery to do, so a sensor fault costs charging rate and power on a perfectly healthy pack.
What this code means
Battery temperature sensor G has a circuit fault.
The family's argument is at P0BC2: a battery does not have a temperature, so it is measured in many places, and a faulty reading changes what the car permits rather than merely misinforming it.
Sensor G is where the pack's neighbour-comparison chain runs out, and that is worth knowing before reading the rest of this family. Sensors A through H are each checked against the one beside them — the correlation codes at P0C6E–P0C72, P0C86 and P0C87 walk the chain link by link. G and H are its last two links.
Likely causes
Start here
- Faulty battery temperature sensor · specialist
- Corroded or loose connector · easy
Less common
- Damaged cell voltage sense harness · specialist
- Faulty battery pack sensor module · specialist
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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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.
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