Powertrain, generic (extended)

P2D05 Motor Electronics Coolant Pump B Stuck/Stalled

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D05 opens the pump B block of the motor electronics series: the second electric pump in the loop that cools inverters and drive-motor electronics is commanded and supplied, yet its rotor does not move. Where a vehicle has two electric drive units, B may be the pump serving the second inverter. A seized bearing, debris after a coolant change, a burnt winding or coolant that froze in a weak mixture can lock it. No manufacturer publicly documents P2D05. Ford's 2024 summary shows the fault type as actuator stuck (71) for its auxiliary pumps, and on pump A the 2020 Ford hybrids store the equivalent P2D00. CARB requires the outputs of inverter thermal management to be monitored. Slow running is P2D07, overspeed P2D06. A stalled pump cuts flow, so derating and warnings follow.

Likely causes

Seized bearing or blocked rotor in pump B
Debris or deposits in the loop after repairs or coolant change
Failed motor winding or pump electronics unable to start the motor
Coolant frozen because the antifreeze ratio is too low

Symptoms

  • Malfunction or hybrid system warning lamp on
  • No pump noise or vibration when the pump should run
  • Rising temperature of the second inverter, power limited

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.8–3 h

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

Parts involved

motor electronics coolant pump bpower electronics coolant loop

Related codes

P2D06P2D07P2D00P2D0AP0C74

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