Powertrain, generic · Hybrid propulsion

P0A3C Drive Motor A Inverter Over Temperature

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A3C reports overheating of the inverter that powers drive motor A, usually measured at its IGBT power switches. Mitsubishi sets it on the 2023 Outlander PHEV when the front motor control unit reads 166 °C or more at the U-phase upper IGBT for 0.12 s; other switch positions have their own P30xx codes. Honda calls it motor control module overheating and lists it among the codes caused by a cracked solder joint in the 2012-15 Civic Hybrid motor power inverter, covered by a warranty extension. On the 2023-25 Accord Hybrid and 2025-26 Civic Hybrid, Honda links it to a PCU radiator damaged by road debris. P0A78 is the general inverter performance code, P0C11 to P0C13 are phase-specific. Power is cut to protect the inverter.

Likely causes

PCU or inverter radiator damaged or leaking (Honda Accord/Civic Hybrid)
Internal inverter defect such as a cracked solder joint (Honda Civic Hybrid 2012-15)
Low coolant or failed electric pump in the inverter cooling circuit
Radiator fan not running

Symptoms

  • Hybrid system warning and check engine light
  • Strongly reduced drive power
  • Coolant loss from the inverter circuit

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–5,000
Time1–8 h

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

Parts involved

inverterdrive motor aigbt module

Related codes

P0A3DP0A3EP0A78P0C11P0C12P0C13

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