OBD II Fault Code

  • OBD II P0A03

OBD-II Code Engine may overheat is defined as a Motor Electronics Coolant Temperature Sensor Circuit High

The Hybrid System has its own cooling system. The Motor Electronics Coolant Temperature Sensor monitors the temperature of the hybrid cooling system. If the engine computer (PCM) sees an implausible signal from this sensor, code P0A03 will be stored.

Engine may overheat Symptoms

  • Engine may overheat

Common Problems That Trigger the P0A03 Code

  • High voltage coolant temperature sensor failure
  • Powertrain Control Module (PCM) failure
  • Wiring issue
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