What Does P0C1D Mean?
DTC P0C1D indicates that the internal temperature sensor in the auxiliary transmission fluid pump control module is reporting values that are outside the expected range or are not changing appropriately with operating conditions. This range/performance code means the sensor is connected and providing a signal, but the readings are implausible — either stuck at one value, changing too slowly, or not correlating with expected thermal behavior.
Common Causes
30%
Temperature sensor drifting out of calibration due to age or heat cycling
25%
Intermittent connection at the sensor causing erratic readings
20%
Sensor signal wire with high resistance from corrosion or damage
15%
Electromagnetic interference affecting the sensor signal
10%
Control module A/D converter degradation
Diagnostic Steps
1
Step 1: Monitor the temperature sensor reading in real-time while the pump is operating. Compare the reported temperature with an independent measurement (infrared thermometer on the module housing). The readings should track within a reasonable range.
2
Step 2: Check if the sensor reading is stuck at a fixed value or responding sluggishly. A stuck reading indicates a failed sensor; a sluggish response may indicate a wiring issue.
3
Step 3: Inspect the wiring between the temperature sensor and the monitoring circuit for damage, corrosion, or routing near high-current cables that could cause interference.
4
Step 4: If the sensor is externally accessible, measure its resistance and compare to the manufacturer's resistance-vs-temperature chart. Replace if out of spec.
5
Step 5: Clear the code, perform a complete cold-start-to-operating-temperature drive cycle, and check if the code returns. Document the sensor readings throughout.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
DTC P0C1D indicates that the internal temperature sensor in the auxiliary transmission fluid pump control module is reporting values that are outside the expected range or are not changing appropriately with operating conditions. This range/performance code means the sensor is connected and providin...
The most common cause of P0C1D (Auxiliary Transmission Fluid Pump Control Module Internal Temperature Sensor Circuit Range/Performance) is: Temperature sensor drifting out of calibration due to age or heat cycling
Typical repair costs for P0C1D range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A sensor with poor range/performance may not accurately detect overheating conditions, leaving the control module vulnerable to thermal damage. The pump may operate in a derating mode as a precaution, reducing transmission fluid flow.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C1D to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Transmission Auxiliary Pump
Difficulty
Type
Generic (SAE)
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