Powertrain, generic (extended)

P2E41 Hybrid/EV Electronics Coolant Pump B Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2E41 flags an electrical fault on the line over which the controller commands electronics coolant pump B, the second pump serving inverter, DC/DC converter and frequently the charger; the maker decides which pump is B. No manufacturer publicly documents P2E41. GM's 2018 hybrid tables show the logic for the pump A counterpart P0CE9: the controller watches the current on the PWM command line and fails it below 200 mA or above 3 A while active, after 16 failures in 20 samples taken every 250 ms, Type B. Ford's 2024 summary checks the command line of its auxiliary pump B for an open circuit (fault type 13) within 5 s at 11 V or more. Broken wires, corroded pins and pumps with dead input electronics are typical. Audi logged pump A's circuit code on the e-tron alongside low coolant. Low and High are P2E43 and P2E44.

Likely causes

Broken or disconnected control wire between module and pump B
Corroded or pushed-back pins at the pump connector
Pump B electronics no longer load the command line
Faulty output stage in the controlling module

Symptoms

  • Hybrid or electric drive warning and MIL
  • Pump B does not run, electronics loop warms up faster
  • Reduced drive power or interrupted charging under high load

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

P2E43P2E44P2E45P2E42P0CE9

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