What Does P0BD4 Mean?
The drive motor inverter temperature sensor "C" circuit is reading above the maximum expected voltage threshold. This typically indicates a short circuit condition in the sensor or wiring, causing the control module to interpret an implausibly high temperature. The system will likely impose severe power limitations on the drive motor to protect the inverter.
Safety Warning
The falsely high temperature will likely cause the control module to severely restrict or disable traction motor power. This can result in significantly reduced acceleration capability and may force the vehicle into a limp-home mode. If caused by a coolant leak, immediate attention is needed to prevent actual inverter damage.
Common Causes
30%
Shorted NTC thermistor in sensor C (resistance near zero)
25%
Short to ground in the sensor C signal wire within the inverter housing
20%
Coolant contamination creating a conductive path at the sensor connector
15%
Wiring pinched at the inverter housing seal or mounting point
10%
Sensor damaged by actual overheating event causing permanent low resistance
Diagnostic Steps
1
Check the scan tool — sensor C will show an extremely high or maximum temperature while sensors A and B read normally.
2
Disconnect sensor C and check if the voltage returns to the reference level at the control module — this confirms the fault is in the sensor or its wiring.
3
Measure the disconnected sensor resistance — near-zero ohms confirms a shorted sensor.
4
Inspect the inverter housing for coolant leaks that could contaminate the sensor connector and create conductive paths.
5
Examine the sensor wiring within the inverter enclosure for pinching, chafing against the housing, or thermal damage.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The drive motor inverter temperature sensor "C" circuit is reading above the maximum expected voltage threshold. This typically indicates a short circuit condition in the sensor or wiring, causing the control module to interpret an implausibly high temperature. The system will likely impose severe p...
The most common cause of P0BD4 (Drive Motor Inverter Temperature Sensor "C" Circuit High) is: Shorted NTC thermistor in sensor C (resistance near zero)
Typical repair costs for P0BD4 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The falsely high temperature will likely cause the control module to severely restrict or disable traction motor power. This can result in significantly reduced acceleration capability and may force the vehicle into a limp-home mode. If caused by a coolant leak, immediate attention is needed to prevent actual inverter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BD4 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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