Powertrain, generic (extended)

P2C67 Hybrid/EV Electronics Coolant Pump A Overspeed

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

With P2C67 the electronics coolant pump A runs faster than commanded. A centrifugal pump speeds up as soon as it loses load, so air in the loop is the leading suspect, followed by a loose impeller or a faulty speed signal. Mercedes logs the related dry-run code P2B2A7A on the GLE/GLS 167 with M177 V8 and 48 V system: air in the low-temperature loop sends the 15 W pump into an emergency dry-run mode, and the cluster shows a yellow coolant message. A Pierburg patent detects dry running by letting the motor coast after a defined energy pulse and counting rotor turns. No manufacturer documents P2C67 itself. Ford's 2024 summary treats overspeed/dry run (B1) as its own pump fault type. Underspeed is P2C66, dry run P2B2A.

Likely causes

Air in the electronics loop after service or from a leak
Low coolant level in the low-temperature reservoir
Impeller slipping on the shaft or broken
Implausible speed feedback from the pump electronics

Symptoms

  • Coolant or drive system warning in the cluster
  • Churning or gurgling noise from the pump
  • Reduced power when electronics temperatures climb

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,000
Time0.5–3 h

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

Parts involved

hybrid electronics coolant pump apower electronics coolant loop

Related codes

P2C66P2C68P2B2AP0CEAP2E48P2E46

References: law.cornell.edu, static.nhtsa.gov, patents.google.com, fordservicecontent.com.