What Does P0C26 Mean?
DTC P0C26 indicates an abnormal current draw detected in the auxiliary transmission fluid pump motor. The PCM/TCM monitors motor current to ensure the pump is operating within its designed parameters. An out-of-range current reading suggests the motor is mechanically binding, electrically degraded, or experiencing a wiring issue that affects current flow.
Common Causes
30%
Auxiliary transmission fluid pump motor mechanically seized or binding
25%
Worn pump motor brushes or internal winding degradation
20%
High resistance in pump motor power or ground circuit wiring
15%
Contaminated or degraded transmission fluid causing excessive pump load
10%
Faulty current sensing circuitry in the control module
Diagnostic Steps
1
Use a current clamp on the auxiliary pump motor feed wire to measure actual current draw and compare to manufacturer specifications.
2
Check transmission fluid condition — dark, burnt, or contaminated fluid can increase pump resistance and current draw.
3
Inspect the pump motor power and ground wiring for high resistance connections or damaged conductors.
4
Attempt to manually spin the pump (if accessible) to check for mechanical binding or debris.
5
If current draw is abnormal with good wiring and fluid, replace the auxiliary transmission fluid pump assembly.
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
DTC P0C26 indicates an abnormal current draw detected in the auxiliary transmission fluid pump motor. The PCM/TCM monitors motor current to ensure the pump is operating within its designed parameters. An out-of-range current reading suggests the motor is mechanically binding, electrically degraded, ...
The most common cause of P0C26 (Auxiliary Transmission Fluid Pump Motor Current) is: Auxiliary transmission fluid pump motor mechanically seized or binding
Typical repair costs for P0C26 range from $250 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Abnormal pump motor current can indicate an impending pump failure. If the pump fails completely, the transmission may lose fluid pressure during critical operating modes, leading to overheating and internal damage. Diagnose and repair before extended driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C26 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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