Powertrain, generic · Hybrid propulsion

P0C74 Motor Electronics Coolant Pump B Control Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C74 is the performance check for coolant pump B of the motor electronics, found on vehicles with a second electric pump in the power electronics cooling. The controller compares how the pump should run with how it actually runs and stores the code when the two disagree for longer than calibrated. Stellantis is the only maker found documenting it by code: for 2023-2024 Jeep Renegade and Compass 4xe with the 1.3 L plug-in hybrid, bulletins 08-165-24, 08-193-24 and 08-064-25 cure a lit MIL with P0C74 by flashing new software into the hybrid controller and the power inverter module, with no parts replaced. Where software is current, air in the loop, a worn or blocked pump and wiring faults remain. Pump A uses P0C73, pump C P2BD7.

Likely causes

Hybrid control or inverter module software, fixed by an update
Air pocket in the power electronics coolant loop
Pump B worn, blocked or seized
Damaged wiring or corroded connector at pump B

Symptoms

  • Malfunction indicator lamp on
  • Reduced electric drive power when the electronics run hot

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–700
Time0.3–3 h

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

Parts involved

motor electronics coolant pump bcoolant circuithybrid control module

Related codes

P0C73P2BD7P2600

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