What Does P0AED Mean?
The powertrain control module has detected a general circuit malfunction in drive motor inverter temperature sensor A. This sensor monitors the temperature of the power inverter that converts DC battery power to AC for the electric drive motor. Inverter temperature monitoring is critical because the IGBT power modules and capacitors can be destroyed by overheating, and the PCM uses this data to manage power output and cooling fan requests.
Safety Warning
Without inverter temperature monitoring, the system cannot protect the power electronics from overheating. The PCM will likely derate motor power significantly or disable the electric drive entirely. Continued operation without temperature feedback risks IGBT module failure, which can result in loss of drive power. Have the vehicle serviced before sustained driving.
Common Causes
30%
Failed inverter temperature sensor (NTC thermistor open or shorted)
25%
Damaged wiring between the motor controller and the temperature sensor
20%
Corroded or loose connector at the inverter housing or motor controller
15%
Faulty motor controller temperature sensing input circuit
10%
Sensor dislodged from its mounting in the inverter heat sink
Diagnostic Steps
1
Read inverter temperature sensor A's value with the scan tool. Compare to sensor B (if equipped) and ambient temperature. An implausible reading (e.g., -40C or 200C) confirms a circuit fault.
2
Locate the inverter temperature sensor on the inverter/motor controller assembly. Inspect the connector for damage, corrosion, or moisture intrusion. The inverter is often in the engine bay or integrated with the transaxle.
3
Disconnect the sensor and measure its resistance — typical NTC values at 25C are 5K-50K ohms. An open (OL) or near-zero reading indicates sensor failure.
4
Check wiring continuity and insulation resistance from the sensor connector to the motor controller connector. Each wire should have less than 2 ohms resistance and greater than 100K ohms to ground.
5
If the sensor and wiring are functional, command the motor controller to read the sensor value with a known resistance substituted at the sensor connector. If the reading is correct with the substituted resistor, the sensor was at fault. If still incorrect, the motor controller input circuit has failed.
Estimated Repair Cost
$200 - $1,800
Parts + labor, varies by vehicle and location
The powertrain control module has detected a general circuit malfunction in drive motor inverter temperature sensor A. This sensor monitors the temperature of the power inverter that converts DC battery power to AC for the electric drive motor. Inverter temperature monitoring is critical because the...
The most common cause of P0AED (Drive Motor Inverter Temperature Sensor "A" Circuit) is: Failed inverter temperature sensor (NTC thermistor open or shorted)
Typical repair costs for P0AED range from $200 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without inverter temperature monitoring, the system cannot protect the power electronics from overheating. The PCM will likely derate motor power significantly or disable the electric drive entirely. Continued operation without temperature feedback risks IGBT module failure, which can result in loss of drive power. Have the vehicle serviced before sustained driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0AED to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor & Inverter
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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