Fuel and air

P025A — Fuel Pump Module Control Circuit/Open

Severity: high Drive with care, to a shop

What P025A means

P025A means the engine control module detected an open circuit or other fault in the fuel pump module control circuit. Normally the PCM sends a control signal to the pump module (driver), which adjusts pump output to match engine demand. When that signal is missing or doesn't match what the PCM expects, fuel pressure can no longer be controlled.

Symptoms

  • Check Engine light on
  • Hard starting or no start
  • Engine stalling while driving
  • Loss of power or hesitation
  • Poor fuel economy
  • Unstable idle

Possible causes

  1. Open, chafed or corroded wiring or connectors in the pump control circuit
  2. Faulty fuel pump control module (driver)
  3. Failed fuel pump assembly
  4. Blown fuse or bad fuel pump relay
  5. Low supply voltage or poor ground at the module
  6. Internal PCM fault (uncommon)

How to diagnose

  1. Scan all codes and freeze-frame data; look for related power or fuel pressure codes
  2. Check the fuel pump fuse and relay; swap in a known good relay if needed
  3. Inspect connectors and harness from the PCM to the module and pump for moisture, corrosion and chafing
  4. Verify supply voltage and ground at the pump module
  5. Test the control wire for opens and shorts between the PCM and the module
  6. Measure fuel pressure with a gauge and compare to specification
  7. Check the control signal with a scan tool or scope and test the module
  8. Only suspect the PCM after ruling out everything else

Common fixes

  • Repair or replace damaged wiring and connectors
  • Replace the fuel pump fuse or relay
  • Replace the fuel pump control module
  • Replace the fuel pump assembly
  • Repair, reprogram or replace the PCM if confirmed faulty

P025A on different brands

Ford · manuals
On Ford, P025A:03 is described as invalid fuel pump A control data; it reports the condition the monitor detected, not a confirmed failed part.

Questions and answers

Can I drive with a P025A code?

It's not recommended. The fuel pump may stop suddenly and the engine can stall in traffic. Get the circuit checked and avoid long trips.

Where do I start diagnosing P025A?

Start with the fuse, relay, connectors and wiring to the pump module, since those are the most common and cheapest causes. Then check voltage, ground and fuel pressure.

Do I need a new fuel pump for P025A?

Not necessarily. The code points to the control circuit, not always the pump itself. Rule out wiring, power supply and the control module first.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.