What Does P0C2B Mean?
DTC P0C2B indicates a general fault with the feedback signal from the auxiliary transmission fluid pump control module. The feedback circuit allows the TCM/PCM to verify the pump is operating as commanded. A fault here means the feedback signal is absent, erratic, or otherwise not matching expected patterns, preventing closed-loop control of the pump.
Common Causes
30%
Open or shorted feedback signal wire between the pump module and TCM/PCM
25%
Failed feedback sensor or circuit within the pump control module
20%
Corroded or damaged connector pins on the feedback signal circuit
15%
TCM/PCM internal fault in the feedback signal input circuit
10%
Electromagnetic interference corrupting the feedback signal
Diagnostic Steps
1
Use a scan tool to monitor the auxiliary pump feedback signal PID while commanding the pump on and off.
2
Inspect the feedback signal wire and connector pins at both the pump module and TCM/PCM for damage or corrosion.
3
Measure the feedback signal voltage with a multimeter or oscilloscope to determine if the signal is present and within range.
4
Check for opens or shorts in the feedback wire using a continuity test with connectors disconnected.
5
If wiring is intact, replace the auxiliary pump control module and retest.
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
DTC P0C2B indicates a general fault with the feedback signal from the auxiliary transmission fluid pump control module. The feedback circuit allows the TCM/PCM to verify the pump is operating as commanded. A fault here means the feedback signal is absent, erratic, or otherwise not matching expected ...
The most common cause of P0C2B (Auxiliary Transmission Fluid Pump Control Module Feedback Signal) is: Open or shorted feedback signal wire between the pump module and TCM/PCM
Typical repair costs for P0C2B range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without a valid feedback signal, the TCM/PCM cannot verify proper pump operation and may default to a conservative strategy. This could result in reduced transmission performance or unnecessary limp mode activation. Diagnose to restore proper closed-loop pump control.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C2B to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Hybrid Drivetrain
Difficulty
Type
Generic (SAE)
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