Powertrain, generic · Fuel and air metering (injector circuit)

P025A Fuel Pump Module A Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

On demand-controlled fuel systems the engine module does not drive the pump itself but sends a pump control module the desired pump output on a separate control line, usually as a duty cycle; the module reports back on a monitor line or via CAN. P025A means the control line from the engine module to pump module A is open or faulty. On Ford systems the pump module itself detects the bad command signal and reports it on the monitor line (11–16 V, 2–5 s); Ford uses P025A for the shared line to modules A and B. GM's pump module compares the enable line with the request on the data bus and sets P025A after about 1 s, with the warning light in the first trip; on some Ford vehicles the code does not light it.

Likely causes

Control line to the pump module open or shorted, often along the frame
Connector at the pump module corroded or wet (module often mounted on the frame)
Pump control module faulty (input)
Module ground or supply poor
Engine module output faulty

Symptoms

  • Check engine light (manufacturer-dependent)
  • Hard or no start
  • Rough idle, surging
  • Lack of power from wrong fuel pressure

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel pump control module afuel pump control wiringengine control module

Related codes

P025BP025CP025DP027AP0627P064A

References: law.cornell.edu, fordservicecontent.com, newtonnet.co.uk, gsi.ext.gm.com.