P0C1C: Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit
What to do
As P0C1B. This sensor reports the module's temperature, not the transmission fluid's — worth stating plainly, because the two get mixed up and they lead to different repairs.
What this code means
The sensor reporting the pump control module's own internal temperature is faulty.
Note what this measures: the electronics, not the fluid. The transmission has its own fluid temperature sensor and the two are different readings with different consequences — confusing them sends a diagnosis to the wrong part. Why the module watches its own temperature at all, and what it does about it, are at P0C1B.
Likely causes
Start here
- Faulty auxiliary transmission fluid pump · specialist
- Corroded or loose connector · easy
Less common
- Damaged transmission 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
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.
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