What Does P025A Mean?
The ECM has detected an open circuit or malfunction in the fuel pump module control circuit. The fuel pump module (FPM) controls fuel pump speed and pressure, and this code indicates the ECM cannot communicate with or control the module. This results in the fuel pump either not running or running at a fixed default speed, affecting fuel delivery and engine performance.
Safety Warning
Vehicle may stall without warning or fail to start. If the fuel pump defaults to full speed, excessive fuel pressure could cause fuel leaks. Do not drive until repaired.
Common Causes
35%
Open circuit in the wiring harness between ECM and fuel pump module due to corrosion or break
30%
Failed fuel pump module (FPM/FPDM) with internal circuit board failure
20%
Corroded or damaged connector pins at the fuel pump module or ECM
15%
ECM internal driver failure for the fuel pump module control output
Diagnostic Steps
1
Step 1: Locate the fuel pump driver module (typically mounted near the fuel tank or under the vehicle) and inspect the connector for corrosion, moisture intrusion, or damaged pins.
2
Step 2: With the key on engine off, measure voltage at the fuel pump module control signal wire — verify the ECM is providing a PWM signal (typically 5V square wave) using an oscilloscope.
3
Step 3: Check wiring continuity from the ECM fuel pump control output pin to the fuel pump module input pin — resistance should be less than 1 ohm with no shorts to ground or power.
4
Step 4: Verify fuel pump module power supply (battery voltage) and ground connections are solid — perform voltage drop tests on both circuits (less than 0.5V drop each).
5
Step 5: If wiring is intact, substitute a known-good fuel pump module to confirm the FPM is the root cause before replacement.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The ECM has detected an open circuit or malfunction in the fuel pump module control circuit. The fuel pump module (FPM) controls fuel pump speed and pressure, and this code indicates the ECM cannot communicate with or control the module. This results in the fuel pump either not running or running at...
The most common cause of P025A (Fuel Pump Module Control Circuit/Open) is: Open circuit in the wiring harness between ECM and fuel pump module due to corrosion or break
Typical repair costs for P025A range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may stall without warning or fail to start. If the fuel pump defaults to full speed, excessive fuel pressure could cause fuel leaks. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P025A 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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