Powertrain, generic (extended)

P2E47 Hybrid/EV Electronics Coolant Pump B Underspeed

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2E47 is set when electronics coolant pump B keeps turning but clearly slower than requested. GM's 2018 hybrid tables describe the check for pump A (P19FC): the filtered difference between commanded and reported speed must stay within a calibrated band once the pump has run for 5 s at 11 to 90 % duty, otherwise a Type B fault results. Ford's 2024 summary keeps underspeed (B2) as a fault type of its own, and a Toyota patent for cooling a vehicle drive unit (US20130030643) uses pump speed together with flow and coolant temperature to locate the faulty part. No manufacturer publicly documents P2E47. Unlike a stall (P2E49) the rotor still moves, so bearing friction, impeller deposits, a partial blockage, thick cold coolant or a weak supply are more plausible than a failed motor. Pump A: P2C66.

Likely causes

Stiff bearing or worn pump B
Deposits or debris slowing the impeller
Voltage drop on pump supply or ground under load
Incorrect or aged coolant, too viscous when cold

Symptoms

  • MIL and hybrid system warning
  • Electronics temperatures rise during long drives or fast charging
  • Occasional power limitation

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,000
Time1–4 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

P2E48P2E49P2E42P2C66P2D07

References: gsi.ext.gm.com, fordservicecontent.com, image-ppubs.uspto.gov, law.cornell.edu.