What Does P0A32 Mean?
The Drive Motor 'B' Temperature Sensor Circuit Low code indicates the sensor signal voltage has dropped below the minimum acceptable threshold. With NTC thermistors commonly used in motor temperature sensing, a low voltage reading corresponds to very low resistance, which the controller interprets as an extremely high temperature. This is typically caused by a short-to-ground in the wiring or a sensor with an internally shorted element, not an actual high-temperature condition. The controller will apply maximum thermal derating to protect the motor.
Common Causes
30%
Short-to-ground in the Motor B temperature sensor signal wire
28%
Failed thermistor sensor with internally shorted resistance element
20%
Corroded connector creating a low-resistance path to ground
12%
Wiring insulation damage from road debris or heat causing ground contact
10%
Motor B controller input circuit fault pulling signal voltage low
Diagnostic Steps
1
Check the Motor B temperature reading on the scan tool; an extremely high temperature reading (e.g., over 200 degrees C) on a cold motor confirms a low-circuit electrical fault rather than actual overheating.
2
Disconnect the Motor B temperature sensor connector; if the scan tool reading switches to a very low temperature (open circuit indication), the fault is in the sensor, not the wiring.
3
With the sensor disconnected, use a DVOM to check the signal wire for continuity to ground; any low-resistance path to ground confirms a short circuit in the harness.
4
Inspect the wiring routing from the Motor B temperature sensor, particularly where it passes near the motor housing, subframe, or suspension components that could damage insulation.
5
Measure the disconnected sensor resistance at ambient temperature and compare to the specification chart; resistance well below the expected value indicates an internally shorted sensor.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The Drive Motor 'B' Temperature Sensor Circuit Low code indicates the sensor signal voltage has dropped below the minimum acceptable threshold. With NTC thermistors commonly used in motor temperature sensing, a low voltage reading corresponds to very low resistance, which the controller interprets a...
The most common cause of P0A32 (Drive Motor "B" Temperature Sensor Circuit Low) is: Short-to-ground in the Motor B temperature sensor signal wire
Typical repair costs for P0A32 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The controller will severely limit Motor B output due to the perceived high temperature, reducing rear drive capability. While this protects the motor, it may affect vehicle handling dynamics in AWD configurations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A32 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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