What Does P0C2A Mean?
DTC P0C2A indicates the auxiliary transmission fluid pump motor has stalled — the PCM/TCM detected that the motor stopped rotating while it was commanded to run. A stalled pump motor is a serious condition because it means no auxiliary fluid flow is occurring when it is needed, which can rapidly lead to transmission overheating in hybrid or start-stop vehicles.
Safety Warning
A stalled auxiliary pump provides zero supplemental fluid flow, which can cause rapid transmission overheating in hybrid vehicles during EV mode or start-stop operation. Continued driving risks severe transmission damage. Limit driving and repair immediately.
Common Causes
30%
Pump motor mechanically seized due to internal bearing failure or debris
25%
Foreign material or metal shavings jamming the pump impeller
20%
Complete electrical failure of the pump motor (burned windings)
15%
Loss of power supply to the motor due to open circuit or blown fuse
10%
Severely contaminated or congealed transmission fluid blocking pump operation
Diagnostic Steps
1
Verify power and ground are present at the pump motor connector while commanding the pump on via scan tool.
2
Check the fuse and relay for the auxiliary pump circuit — a blown fuse may indicate a motor short that caused the stall.
3
Attempt to manually rotate the pump shaft to determine if it is mechanically seized.
4
Inspect transmission fluid for excessive contamination, metal debris, or abnormal viscosity that could lock the pump.
5
If the motor has power and ground but will not spin, and the pump is not mechanically jammed, replace the pump motor assembly.
Estimated Repair Cost
$350 - $1,400
Parts + labor, varies by vehicle and location
DTC P0C2A indicates the auxiliary transmission fluid pump motor has stalled — the PCM/TCM detected that the motor stopped rotating while it was commanded to run. A stalled pump motor is a serious condition because it means no auxiliary fluid flow is occurring when it is needed, which can rapidly lea...
The most common cause of P0C2A (Auxiliary Transmission Fluid Pump Motor Stalled) is: Pump motor mechanically seized due to internal bearing failure or debris
Typical repair costs for P0C2A range from $350 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A stalled auxiliary pump provides zero supplemental fluid flow, which can cause rapid transmission overheating in hybrid vehicles during EV mode or start-stop operation. Continued driving risks severe transmission damage. Limit driving and repair immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C2A to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Hybrid Drivetrain
Difficulty
Type
Generic (SAE)
Recommended Tools
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