What Does P0BD3 Mean?
The drive motor inverter temperature sensor "C" circuit is reading below the minimum expected voltage threshold. This indicates an open circuit or extremely high resistance condition in the sensor C circuit, causing the control module to see a temperature value that is impossibly low or at a default error value. The thermal protection for this inverter zone is effectively lost.
Safety Warning
Complete loss of temperature monitoring in one inverter zone. The control module will likely derate the drive motor to prevent potential overheating in the unmonitored zone, reducing available torque for acceleration, hill climbing, and passing. Prolonged operation risks IGBT thermal damage if the derating strategy is insufficient.
Common Causes
35%
Open circuit in the sensor C signal or ground wire
25%
Internally open NTC thermistor in sensor C
20%
Disconnected or unseated connector at sensor C
12%
Corroded pins causing effectively infinite resistance
8%
Control module reference voltage circuit failure for sensor C
Diagnostic Steps
1
Verify the scan tool shows an impossibly low or default error temperature for sensor C while sensors A and B read normally.
2
Check that the sensor C connector is fully seated at both the sensor end and the control module end.
3
Measure continuity on both the signal and ground wires from sensor C connector to the control module connector.
4
With the sensor disconnected, measure its resistance — an open-line (infinite) reading confirms a failed sensor.
5
Check the control module connector pins for the sensor C channel — look for pushed-back, bent, or corroded pins.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The drive motor inverter temperature sensor "C" circuit is reading below the minimum expected voltage threshold. This indicates an open circuit or extremely high resistance condition in the sensor C circuit, causing the control module to see a temperature value that is impossibly low or at a default...
The most common cause of P0BD3 (Drive Motor Inverter Temperature Sensor "C" Circuit Low) is: Open circuit in the sensor C signal or ground wire
Typical repair costs for P0BD3 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Complete loss of temperature monitoring in one inverter zone. The control module will likely derate the drive motor to prevent potential overheating in the unmonitored zone, reducing available torque for acceleration, hill climbing, and passing. Prolonged operation risks IGBT thermal damage if the derating strategy is insufficient.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BD3 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Powertrain - Drive Motor Inverter
Difficulty
Type
Generic (SAE)
Recommended Tools
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