What Does P0C1C Mean?
DTC P0C1C indicates a general circuit fault with the internal temperature sensor within the auxiliary transmission fluid pump control module. The control module uses this sensor to monitor its own operating temperature and trigger thermal protection if needed. A circuit fault means the temperature reading is unreliable, so the module cannot properly protect itself from overheating. The system may default to a conservative operating strategy.
Common Causes
30%
Internal temperature sensor failure within the pump control module
25%
Corroded or damaged connector at the pump control module
20%
Wiring harness fault between the temperature sensor and monitoring circuit
15%
Control module PCB damage (cracked solder joint, trace break)
10%
Software/firmware glitch in the temperature monitoring subsystem
Diagnostic Steps
1
Step 1: Check for companion DTCs P0C1D (range/performance), P0C1E (low), and P0C1F (high) that may further narrow the fault type. Review freeze-frame data for the reported temperature value.
2
Step 2: Inspect the pump control module connector for corrosion, water intrusion, bent pins, or damaged seals. Clean and reseat the connector.
3
Step 3: If the temperature sensor is accessible on the wiring harness (external to the module), check its resistance against the manufacturer specification at a known temperature.
4
Step 4: Clear the code and perform a drive cycle to see if it returns. An intermittent code may indicate a loose connection that can be resolved by reseating connectors.
5
Step 5: If the sensor is internal to the module and not serviceable separately, the pump control module must be replaced as an assembly.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
DTC P0C1C indicates a general circuit fault with the internal temperature sensor within the auxiliary transmission fluid pump control module. The control module uses this sensor to monitor its own operating temperature and trigger thermal protection if needed. A circuit fault means the temperature r...
The most common cause of P0C1C (Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit) is: Internal temperature sensor failure within the pump control module
Typical repair costs for P0C1C range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without a functioning temperature sensor, the pump module cannot protect itself from overheating, which could lead to premature failure and loss of transmission hydraulic pressure during EV operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C1C to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Transmission Auxiliary Pump
Difficulty
Type
Generic (SAE)
Recommended Tools
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