P0C1C
Electric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit
The internal temperature sensor of the auxiliary transmission fluid pump control module reports a generic fault.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Sensor failedCommon
- Internal module faultPossible
Parts involved
- Aux Trans Pump Control Module
P0C1C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.