What Does P0C27 Mean?
DTC P0C27 indicates the auxiliary transmission fluid pump motor is drawing less current than expected. Low current typically means the motor is not engaging properly, has a poor electrical connection, or has an internal open winding. The pump may be spinning freely without actually moving fluid, or it may not be running at all.
Common Causes
30%
Open circuit in the pump motor windings (internal motor failure)
25%
High resistance connection at the pump motor connector
20%
Broken or damaged wire in the motor power supply circuit
15%
Pump impeller disconnected from motor shaft (spinning freely)
10%
Control module not commanding sufficient drive signal to the motor
Diagnostic Steps
1
Measure current draw at the pump motor with a clamp meter while the pump is commanded on via scan tool bidirectional control.
2
Check resistance across the pump motor terminals — an excessively high reading indicates an internal open.
3
Inspect the pump motor connector and wiring for loose terminals, corrosion, or damaged pins that could reduce current flow.
4
Verify the control module is outputting the correct drive voltage/duty cycle to the pump motor.
5
If motor resistance is out of specification, replace the auxiliary transmission fluid pump motor assembly.
Estimated Repair Cost
$250 - $1,100
Parts + labor, varies by vehicle and location
DTC P0C27 indicates the auxiliary transmission fluid pump motor is drawing less current than expected. Low current typically means the motor is not engaging properly, has a poor electrical connection, or has an internal open winding. The pump may be spinning freely without actually moving fluid, or ...
The most common cause of P0C27 (Auxiliary Transmission Fluid Pump Motor Current Low) is: Open circuit in the pump motor windings (internal motor failure)
Typical repair costs for P0C27 range from $250 to $1,100, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low motor current suggests the pump is not providing adequate fluid flow. This can result in insufficient lubrication and cooling of transmission components during hybrid EV-mode or engine-off coasting. Repair before extended driving to prevent internal transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C27 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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