What Does P025D Mean?
The ECM has detected that the fuel pump module control circuit voltage or signal is above the maximum expected threshold. This means the fuel pump may be running at full speed continuously regardless of ECM commands, resulting in excessive fuel pressure. Overpressure in the fuel system can stress fuel injectors and cause rich running conditions.
Common Causes
35%
Short to battery voltage in the fuel pump module control signal wire
25%
Failed fuel pump driver module stuck in high-output mode
20%
ECM driver circuit failure causing constant high signal output
20%
Incorrect fuel pump module installed or aftermarket pump with wrong resistance
Diagnostic Steps
1
Step 1: Measure fuel rail pressure with the scan tool at idle — compare to specification. Pressure significantly above spec confirms overpressure from uncontrolled pump operation.
2
Step 2: Disconnect the fuel pump module control signal wire and measure voltage — it should drop to near 0V. If voltage remains high, there is a short to power in the harness.
3
Step 3: Inspect the wiring harness for chafing against power wires or shorts to battery voltage circuits near bulkheads or fuse boxes.
4
Step 4: Verify the correct fuel pump module and fuel pump assembly are installed for the vehicle application — cross-reference part numbers with manufacturer data.
5
Step 5: If the wiring is clean and components are correct, substitute the fuel pump driver module and verify the ECM can modulate fuel pump speed 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 above the maximum expected threshold. This means the fuel pump may be running at full speed continuously regardless of ECM commands, resulting in excessive fuel pressure. Overpressure in the fuel system can stress fu...
The most common cause of P025D (Fuel Pump Module Control Circuit High) is: Short to battery voltage in the fuel pump module control signal wire
Typical repair costs for P025D range from $100 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Excessive fuel pressure can cause injector leaks and rich running. Drivable short distances but repair promptly to prevent fuel system damage or potential fire hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P025D 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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