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

P025C Fuel Pump Module A Control Circuit Low

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. P025C means the control circuit to pump module A reads low, typically a short to ground. On Ford's 3.0 diesel the pump module detects it; on the 6.7 it means a short on the low side of the pump relay – both within 0.5 s. FCA documents it with the warning light on and sometimes a start followed by stalling, often together with P01C6 and P016F; the checks cover the pump module connector, the low-pressure sensor and a ground point for water, corrosion and pushed-back pins.

Likely causes

Control line chafed to ground at the frame
Water or corrosion at the pump module connector
Ground point loose or corroded
Pump control module faulty internally
Pump relay faulty (Ford 6.7)

Symptoms

  • Check engine light on
  • Engine starts and dies again
  • Starting problems
  • Loss of power from low supply pressure

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
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

P025DP025AP025BP027CP0628P016F

References: law.cornell.edu, fordservicecontent.com, static.nhtsa.gov.