Powertrain, generic (extended)

P2BD5 Motor Electronics Coolant Pump C Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2BD5 flags the command line of the third electric coolant pump in the inverter and motor electronics loop as sitting at too low a level. With a low-side or PWM driver this usually means the wire or the pump input is shorted to ground, so the pump either runs unchecked or not at all. No manufacturer documents P2BD5 publicly. The nearest published logic is Ford's 2019 hybrid summary for pump A: P0A06 is stored once the pump output driver has reported a fault for more than 5 s, with 6 to 19 V on the 12 V system. CARB requires every electronic output of inverter thermal management to be checked for such circuit faults. P2BD4 covers an open line, P2BD6 a short to voltage. If the pump stops, drive power is cut back before the electronics overheat.

Likely causes

Pump C control wire chafed through and touching ground
Water or corrosion in the pump connector bridging the signal pin to ground
Shorted input stage inside pump C
Faulty output driver in the controlling module

Symptoms

  • Warning for the hybrid or drive system, often with the check engine light
  • Pump C runs constantly or stays silent regardless of command
  • Reduced drive power once the electronics warm up

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–900
Time0.5–3 h

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

Parts involved

motor electronics coolant pump cwiring harnesshybrid control module

Related codes

P2BD4P2BD6P2BD7P2D0DP0A06P0B39

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