Powertrain, generic (extended)

P2E44 Hybrid/EV Electronics Coolant Pump B Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2E44 is the opposite fault: the command line of electronics coolant pump B reads higher than its commanded state allows, mostly because it touches a battery-fed wire or the driver can no longer pull it down. Many PWM pumps react to a permanently high input with an emergency mode; Pierburg's interface runs the pump at about 95 % speed for a duty cycle of 98 to 100 %. The loop may therefore stay cooled while the controller has lost all influence on the speed, which also wastes energy and adds noise. Ford's 2024 summary lists circuit high (fault type 12) as a separate failure type of its auxiliary pumps. No manufacturer publicly documents P2E44. Look for harness sections rubbing against live wires, moisture and a defective output stage in the module. P2E43 covers the low side, P0CEC is pump A's equivalent.

Likely causes

Control wire shorted to a battery-voltage circuit
Module output stage unable to pull the line low
Moisture linking supply and signal pins in the connector

Symptoms

  • MIL with hybrid system message
  • Pump B runs continuously at high speed, audible hum
  • Pump does not respond to commanded speed changes

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–700
Time0.5–3 h

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

Parts involved

hybrid electronics coolant pump bpower electronics coolant loop

Related codes

P2E43P2E41P2E45P0CEC

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