Powertrain, generic · Hybrid propulsion

P0A3D Drive Motor B Inverter Over Temperature

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0A3D is the over-temperature code for the inverter feeding drive motor B. On the 2023 Outlander PHEV this is the rear motor control unit, and Mitsubishi sets the code when its IGBT temperature is 156 °C or higher for one second. Mitsubishi's hints list the rear motor assembly, the electric water pump driven by the PHEV-ECU, the EV coolant circuit and the radiator fan, so cooling problems come before electronics. No other manufacturer documents P0A3D publicly; CARB 1968.2 requires monitoring of hybrid components that affect emissions. P0A35 is the over-temperature of motor B itself, P0C14 to P0C16 phase-specific inverter codes and P0A79 the general inverter performance code. Rear drive power is reduced until the inverter cools down.

Likely causes

Electric water pump of the EV cooling circuit failed

Low coolant or air in the EV cooling circuit

Radiator fan not running or radiator blocked

Internal fault in the rear motor and inverter assembly

Symptoms

Hybrid or EV system warning
Reduced rear-axle drive power
Fault appears after long climbs or high load

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–5,000

Time1–8 h

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

Parts involved

drive motor b inverter

References: mitsubishitechinfo.com, mitsubishitechinfo.com, law.cornell.edu.