What Does P0C1E Mean?
DTC P0C1E indicates that the internal temperature sensor circuit in the auxiliary transmission fluid pump control module is reading below the minimum expected voltage or resistance threshold. This low-circuit condition typically means the sensor or its wiring has a short to ground, pulling the signal low. The control module cannot determine its true operating temperature, so it may default to a conservative operating mode to prevent potential thermal damage.
Common Causes
30%
Temperature sensor signal wire shorted to ground
25%
Internal short circuit in the temperature sensor element
20%
Water intrusion into the connector causing signal leakage to ground
15%
Chafed wiring contacting metal chassis or bracket
10%
Control module internal circuit fault pulling the sensor input low
Diagnostic Steps
1
Step 1: Read the current sensor circuit voltage or resistance with the scan tool. A low-circuit code means the value is below the minimum threshold — note the actual reading.
2
Step 2: Disconnect the pump control module connector and measure the resistance of the temperature sensor circuit. Compare with specification. A very low resistance indicates a short.
3
Step 3: With the connector disconnected, check for continuity between the sensor signal wire and chassis ground. Any continuity indicates a short to ground in the harness.
4
Step 4: Inspect the wiring harness for chafing against brackets, heat shields, or sharp edges. Check the connector for water intrusion, corrosion, or contamination.
5
Step 5: If the harness and connector are clean and the short is internal to the module, the pump control module assembly requires replacement.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
DTC P0C1E indicates that the internal temperature sensor circuit in the auxiliary transmission fluid pump control module is reading below the minimum expected voltage or resistance threshold. This low-circuit condition typically means the sensor or its wiring has a short to ground, pulling the signa...
The most common cause of P0C1E (Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit Low P0C1F Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit High) is: Temperature sensor signal wire shorted to ground
Typical repair costs for P0C1E range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without accurate temperature monitoring, the pump module could overheat without triggering thermal protection, potentially leading to pump failure and loss of transmission hydraulic function during EV driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C1E 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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