Faulty inverter temperature sensor or sensor internal fault; Damaged wiring, short or open circuit in the sensor circuit; Corroded, loose or contaminated connector at the sensor or inverter; Fault inside the inverter assembly or its control board; Inverter cooling system problem causing a real over-temperature that disagrees with the sensor; Outdated or faulty control unit software where the manufacturer has a known fix.

P0AED

Drive Motor Inverter Temperature Sensor A Circuit.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
A: AreaHybrid propulsion
ED: FaultThe specific fault in that area

What it means

P0AED is a generic hybrid and electric vehicle code for a fault in the drive motor inverter temperature sensor 'A' circuit. The control unit monitors the sensor signal against an expected range and plausibility limits. It saw a voltage or resistance outside that range, or a reading that does not match other temperature data. Exact sensor location and fault limits depend on the model and system design.

Symptoms

Hybrid or EV system warning light on the dashboard
Reduced power or limp mode
Reduced regenerative braking or assist
Inverter or cooling fan running harder than normal
Hybrid system refusing to start or ready mode dropping out (in some cases)

Possible causes

Faulty inverter temperature sensor or sensor internal faultlikely
Damaged wiring, short or open circuit in the sensor circuitlikely
Corroded, loose or contaminated connector at the sensor or inverterpossible
Fault inside the inverter assembly or its control boardpossible
Inverter cooling system problem causing a real over-temperature that disagrees with the sensorpossible
Outdated or faulty control unit software where the manufacturer has a known fixrare

How to diagnose

Read all stored and pending codes and note any cooling, inverter or motor codes alongside P0AED.
Review freeze frame data and live data: compare the inverter temperature reading with other temperature values on a cold car, where they should be similar.
Check the inverter coolant level and condition, and confirm the coolant pump and fans operate, following the manufacturer's procedure.
Visually inspect the wiring and connectors in the sensor circuit for chafing, heat damage, water ingress and corrosion, with the high voltage system made safe by a trained person first.
Wiggle test the harness with live data on screen to see if the temperature reading jumps or drops out.
Measure sensor resistance and circuit voltage, and check for short or open circuits, against the manufacturer's figures for that model.
Check for technical service bulletins or software updates relevant to the vehicle.
Only after the circuit and sensor are proven good, consider testing the inverter assembly.

How to fix

Repair or replace damaged wiring and clean or replace faulty connectors.
Replace the inverter temperature sensor if it is a serviceable part, or the assembly if the sensor is not sold separately.
Restore the cooling system: top up and bleed it correctly, and repair any faulty pump, hose or fan.
Replace or repair the inverter if an internal fault is confirmed.
Update the control unit software only if the manufacturer lists it as a fix for this fault.

Can I keep driving?

Medium severity

The car may be driven carefully a short distance if it runs normally, but expect reduced power and book it in soon. Stop if the car shows a red warning, loses drive or overheats. Work on the high voltage system must only be done by a suitably trained person.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.