P0A03 Possible Causes
- Faulty engine coolant temperature sensor
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
What Does It Mean?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0A03 Possible Symptoms
Engine Light On (or Service Engine Soon Warning Light)
P0A03 Description
The Power Management Control Electronic Control Unit (ECU) detects the HV coolant temperature using the coolant temperature sensor integrated in the inverter with converter assembly.
The Power Management Control ECU uses the coolant temperature sensor signals to verify the effectiveness of the inverter cooling system.
If necessary, the Power Management Control ECU will limit the inverter output to prevent inverter overheating. The Power Management Control ECU also detects sensor malfunctions based on HV coolant temperature sensor values. The inverter with converter assembly detects malfunctions in the HV coolant temperature sensor and its wiring.
OBDII Code P0A03 – Engine Electronics Coolant Temperature Sensor Circuit High