What Does P0C25 Mean?
DTC P0C25 indicates the auxiliary transmission fluid pump control module circuit voltage is higher than the expected threshold. This typically suggests a short-to-voltage condition in the control circuit wiring or an internal fault within the module itself. An excessively high signal can cause the pump to run at an unintended speed or prevent proper control by the TCM/PCM.
Common Causes
30%
Short-to-battery voltage in the control module wiring harness
25%
Failed auxiliary pump control module with internal short-to-power
20%
Connector pin cross-contamination or pin-to-pin short
15%
Damaged wiring harness contacting a power source
10%
TCM/PCM driver circuit fault producing excessive output voltage
Diagnostic Steps
1
Measure voltage at the auxiliary pump control module connector with key on to confirm an above-specification reading.
2
Disconnect the control module and recheck voltage on the signal wire to determine if the high voltage originates from the wiring or the module.
3
Inspect the harness for damaged insulation where wires may contact power sources or other circuits carrying battery voltage.
4
Check for pin-to-pin shorts at both the module connector and the TCM/PCM connector using a multimeter.
5
If wiring checks clean, replace the auxiliary pump control module and clear codes.
Estimated Repair Cost
$130 - $800
Parts + labor, varies by vehicle and location
DTC P0C25 indicates the auxiliary transmission fluid pump control module circuit voltage is higher than the expected threshold. This typically suggests a short-to-voltage condition in the control circuit wiring or an internal fault within the module itself. An excessively high signal can cause the p...
The most common cause of P0C25 (Auxiliary Transmission Fluid Pump Control Module Circuit High) is: Short-to-battery voltage in the control module wiring harness
Typical repair costs for P0C25 range from $130 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A high circuit condition can cause the auxiliary pump to run uncontrolled or at incorrect speeds, potentially leading to abnormal transmission fluid pressure. This may cause erratic shifting behavior or transmission overheating. Have the vehicle inspected promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C25 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Hybrid Drivetrain
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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