Powertrain, generic (extended)

P25EE Vacuum Pump Control Circuit B/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P25EE covers the second control circuit of an electric brake vacuum pump, the part of the wiring that should carry voltage while the pump is switched on. Ford's 2019 OBD summary for its hybrid and plug-in models assigns P25EE to the brake system module, mapped from that module's own code C1036: with the pump relay commanded closed, a monitoring line voltage below 250 mV for one second means the pump is not getting its supply, typically from an open circuit, a failed relay contact or a blown fuse. Circuit A (P258A) is judged with the relay open instead. On these vehicles the pump keeps the brake booster supplied when the combustion engine is shut down. P25EF to P25F1 are the performance, low and high codes of the same circuit. CARB treats such electrical outputs as comprehensive components. The pedal can turn hard.

Likely causes

Blown vacuum pump fuse
Pump relay contact not closing
Broken wire or loose connector between relay and pump

Symptoms

  • Hard brake pedal, especially with the engine off or in electric drive
  • Brake or traction warning lamp in addition to the check engine lamp
  • Vacuum pump never heard running

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–600
Time0.3–2.5 h

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

Parts involved

vacuum pumppump relaywiring harness

Related codes

P25EFP25F0P25F1P258AP050F

References: fordservicecontent.com, law.cornell.edu.