Powertrain, generic (extended)

P2D03 Motor Electronics Coolant Pump A Supply Voltage Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D03 concerns the power feed of motor electronics coolant pump A rather than its command line: the pump, or the module reading its status, finds the supply outside its allowed window or missing. That points to a blown fuse, a corroded connector, a weak ground or a 12 V system that drops too low. The command-side faults of the same pump are P0A05 to P0A07; Ford's 2019 hybrid summary checks those with 6 to 19 V on the 12 V net. Ford lists P2D03 in the 2020 hybrid bulletins 20-2221 (Escape HEV) and 20-2293/20-2345 (Explorer, Aviator, Police Interceptor Utility hybrid), where reprogramming after a coolant check cleared it. In the 2024 summary the matching pump fault type is 1C, supply voltage out of range. A pump without proper power stops cooling the inverter.

Likely causes

Corroded connector, loose terminal or poor ground at pump A
Blown fuse or faulty relay in the pump feed
Weak 12 V battery or DC/DC converter output too low
Software strategy on 2020 Ford hybrids, cured by reprogramming

Symptoms

  • Malfunction indicator lamp on
  • Pump A runs intermittently or not at all
  • Further low-voltage codes in other modules

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–600
Time0.4–2.5 h

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

Parts involved

motor electronics coolant pump apower electronics coolant loop

Related codes

P2D00P2D01P2D04P2D08P2D0DP0A05

References: static.nhtsa.gov, static.nhtsa.gov, fordservicecontent.com, fordservicecontent.com.