What Does P025C Mean?
The ECM has detected that the fuel pump module control circuit voltage or signal is below the minimum expected threshold. This indicates the fuel pump module is receiving an abnormally low control signal, which typically results in the fuel pump running at reduced speed or not running at all, leading to low fuel pressure and potential engine stalling.
Safety Warning
Vehicle may stall at any time due to insufficient fuel pressure. Do not drive until the root cause is identified and repaired.
Common Causes
35%
Short to ground in the fuel pump module control signal wire
25%
Failed fuel pump driver module with low output
20%
ECM fuel pump control driver providing insufficient signal voltage
20%
Corroded connector causing high resistance and signal attenuation
Diagnostic Steps
1
Step 1: Backprobe the fuel pump module control signal wire at the ECM connector and measure the PWM signal amplitude with an oscilloscope — signal should be a clean 5V or 12V square wave depending on the system.
2
Step 2: Disconnect the fuel pump module and measure control signal wire to ground resistance — should be infinity (open). Low resistance indicates a short to ground in the harness.
3
Step 3: Inspect the wiring harness routing from ECM to fuel pump module for chafing, pinching, or contact with sharp metal edges that could cause a short to ground.
4
Step 4: Check the fuel pump module connector for moisture, corrosion, or bent pins that could attenuate the control signal.
5
Step 5: If the wiring is clean and the ECM output is correct, replace the fuel pump driver module and verify proper fuel pressure response across the duty cycle range.
Estimated Repair Cost
$100 - $750
Parts + labor, varies by vehicle and location
The ECM has detected that the fuel pump module control circuit voltage or signal is below the minimum expected threshold. This indicates the fuel pump module is receiving an abnormally low control signal, which typically results in the fuel pump running at reduced speed or not running at all, leadin...
The most common cause of P025C (Fuel Pump Module Control Circuit Low) is: Short to ground in the fuel pump module control signal wire
Typical repair costs for P025C range from $100 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may stall at any time due to insufficient fuel pressure. Do not drive until the root cause is identified and repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P025C to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Delivery System
Difficulty
Type
Generic (SAE)
Recommended Tools
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