What Does P0A2D Mean?
The Drive Motor 'A' Temperature Sensor Circuit High code indicates the sensor signal voltage is above the maximum expected range, which with an NTC thermistor translates to an implausibly low temperature reading. This typically results from an open circuit in the sensor wiring, a disconnected sensor, or a sensor with an internally open thermistor element. The motor controller cannot determine actual motor temperature and will restrict motor operation as a safety precaution.
Common Causes
30%
Open circuit in the temperature sensor wiring between sensor and controller
25%
Disconnected or unseated temperature sensor connector
22%
Failed temperature sensor with internally open thermistor element
13%
Corroded connector pins creating an open-circuit condition
10%
Motor controller reference voltage fault overpowering the sensor signal
Diagnostic Steps
1
Check the Motor A temperature reading on the scan tool; if it shows an implausibly low temperature (e.g., -40 degrees or below ambient on a warm motor), the high-circuit/open condition is confirmed.
2
Verify the temperature sensor connector is fully seated and locked; vibration can gradually work connectors loose on motor-mounted sensors.
3
Disconnect the sensor and measure its resistance; an infinite (OL) reading confirms an open sensor element requiring replacement.
4
If the sensor resistance is within specification, check the wiring continuity from the sensor connector to the motor controller connector; an open wire is the most common cause.
5
Inspect the wiring harness at stress points, connector entries, and areas near moving parts for broken conductors hidden within intact insulation.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The Drive Motor 'A' Temperature Sensor Circuit High code indicates the sensor signal voltage is above the maximum expected range, which with an NTC thermistor translates to an implausibly low temperature reading. This typically results from an open circuit in the sensor wiring, a disconnected sensor...
The most common cause of P0A2D (Drive Motor "A" Temperature Sensor Circuit High) is: Open circuit in the temperature sensor wiring between sensor and controller
Typical repair costs for P0A2D range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without temperature feedback, the motor controller cannot protect against overheating. The controller typically limits motor output significantly, reducing vehicle performance. Extended operation without temperature monitoring risks permanent motor damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A2D to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Powertrain
Difficulty
Type
Generic (SAE)
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