What Does P0C24 Mean?
DTC P0C24 indicates the auxiliary transmission fluid pump control module circuit voltage is lower than the expected threshold. This typically points to a short-to-ground condition, excessive resistance in the circuit, or a failing control module pulling the signal low. Without proper voltage, the auxiliary pump may not operate at the correct speed or may fail to engage entirely.
Common Causes
30%
Short-to-ground in the wiring harness between TCM and auxiliary pump module
25%
Corroded connector terminals causing high resistance and voltage drop
20%
Failed auxiliary pump control module with internal short
15%
Damaged wire insulation allowing intermittent ground contact
10%
Low system voltage or poor ground connection at the module
Diagnostic Steps
1
Measure the voltage at the auxiliary pump control module connector pins with key on engine running to determine if it is below specification.
2
Inspect the wiring harness for chafed insulation, pinched wires, or areas where the harness contacts metal body or frame components.
3
Disconnect the control module and check for short-to-ground on each circuit wire using a multimeter set to resistance.
4
Verify the ground path for the control module circuit has less than 0.5 ohms resistance.
5
If no wiring faults are found, test or replace the auxiliary pump control module.
Estimated Repair Cost
$120 - $750
Parts + labor, varies by vehicle and location
DTC P0C24 indicates the auxiliary transmission fluid pump control module circuit voltage is lower than the expected threshold. This typically points to a short-to-ground condition, excessive resistance in the circuit, or a failing control module pulling the signal low. Without proper voltage, the au...
The most common cause of P0C24 (Auxiliary Transmission Fluid Pump Control Module Circuit Low) is: Short-to-ground in the wiring harness between TCM and auxiliary pump module
Typical repair costs for P0C24 range from $120 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced or absent auxiliary pump operation can lead to insufficient transmission fluid pressure during engine-off periods in hybrid vehicles. This may cause harsh shifts, slipping, or premature transmission wear. Address promptly to avoid costly transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C24 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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