Powertrain, generic · Hybrid propulsion

P0A7C Motor Electronics Over Temperature

Check engine lightUsually off
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A7C reports that the electronics controlling the hybrid motors, mainly the inverter, have run hotter than allowed. Ford uses the code on its hybrids and stores it in the PCM. A Ford bulletin for 2010-11 Fusion and Milan Hybrid and 2011 MKZ Hybrid built up to 9 September 2010 describes a wrench light with no drivability concern and P0A7C, cured by a PCM software update. Ford warranty statistics supplied to NHTSA list P0A7C as a recurring code on 2010-12 Escape, Tribute and Mariner Hybrid. Common physical causes are a failed coolant pump of the motor electronics cooling loop, low coolant, air in the loop or a blocked radiator. CARB requires monitoring of inverter thermal management. P0A3C and P0A3D cover the individual inverters. Power is reduced to protect the electronics.

Likely causes

Coolant pump of the motor electronics cooling loop failed
Low coolant or air in the electronics cooling loop
PCM calibration triggering the code without real overheating (Ford Fusion Hybrid)
Blocked electronics radiator or faulty cooling fan

Symptoms

  • Wrench or hybrid warning light
  • Reduced power, especially under high load or heat

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.3–4 h

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

Parts involved

motor electronicsmotor electronics coolant pump

Related codes

P0A3CP0A3DP0A93P0AEDP0AF0

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