What Does P0BD1 Mean?
The drive motor inverter temperature sensor "C" circuit has a general electrical fault. This is the third temperature sensor (C) on the drive motor inverter, which converts DC battery power to AC for the main traction motor. Multiple temperature sensors monitor different zones of the inverter power module, and sensor C's failure creates a gap in thermal protection coverage.
Safety Warning
The drive motor inverter handles the highest power levels in the hybrid system. Loss of one temperature sensor zone means the IGBT modules in that section could overheat without detection. The vehicle may limit traction motor power output as a precaution, affecting acceleration and hill-climbing capability.
Common Causes
30%
Failed temperature sensor C within the drive motor inverter assembly
25%
Damaged or severed wiring to sensor C between the inverter and control module
20%
Corroded or disconnected connector at the sensor C terminal
15%
Hybrid/motor control module input circuit failure for sensor C channel
10%
Thermal damage to the sensor from an inverter overheating event
Diagnostic Steps
1
Read all drive motor inverter temperature sensors (A, B, C) on the scan tool — sensor C should show a value consistent with A and B at cold soak.
2
Measure sensor C resistance at its connector and compare to the NTC specification for the current ambient temperature.
3
Inspect the sensor C connector at both the inverter and control module for corrosion, damage, or moisture intrusion.
4
Check wiring continuity between the sensor connector and the control module for both signal and ground wires.
5
Look for signs of previous overheating on the inverter housing near sensor C that may have damaged the sensor thermally.
Estimated Repair Cost
$300 - $2,500
Parts + labor, varies by vehicle and location
The drive motor inverter temperature sensor "C" circuit has a general electrical fault. This is the third temperature sensor (C) on the drive motor inverter, which converts DC battery power to AC for the main traction motor. Multiple temperature sensors monitor different zones of the inverter power ...
The most common cause of P0BD1 (Drive Motor Inverter Temperature Sensor "C" Circuit) is: Failed temperature sensor C within the drive motor inverter assembly
Typical repair costs for P0BD1 range from $300 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The drive motor inverter handles the highest power levels in the hybrid system. Loss of one temperature sensor zone means the IGBT modules in that section could overheat without detection. The vehicle may limit traction motor power output as a precaution, affecting acceleration and hill-climbing capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BD1 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
OBD2 Scanner
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