What Does P0BD2 Mean?
The drive motor inverter temperature sensor "C" is reporting values outside the expected range or not responding proportionally to actual temperature changes. The sensor provides data but it is implausible compared to sensors A and B, or it responds too slowly or erratically to temperature changes during normal operation. The control module flags this as unreliable data.
Common Causes
30%
Degraded NTC thermistor with shifted resistance curve from thermal stress
25%
Poor thermal interface between sensor C and the inverter heat sink
20%
Partial blockage in the inverter cooling circuit near the sensor C zone
15%
High-resistance connection degrading the signal accuracy
10%
Control module calibration error or A/D converter drift on sensor C input
Diagnostic Steps
1
At cold soak, compare sensor C reading to sensors A and B — a deviation of more than a few degrees indicates a sensor or mounting issue.
2
Drive the vehicle under moderate load and monitor all three inverter temperature sensors — sensor C should track similarly to A and B.
3
Check the inverter cooling system — coolant level, flow rate, and look for air pockets that might affect the sensor C zone.
4
If accessible, inspect sensor C mounting for proper thermal compound application and secure contact with the heat sink surface.
5
Bench test the sensor by measuring resistance at several known temperatures to verify it has not drifted from specification.
Estimated Repair Cost
$250 - $2,000
Parts + labor, varies by vehicle and location
The drive motor inverter temperature sensor "C" is reporting values outside the expected range or not responding proportionally to actual temperature changes. The sensor provides data but it is implausible compared to sensors A and B, or it responds too slowly or erratically to temperature changes d...
The most common cause of P0BD2 (Drive Motor Inverter Temperature Sensor "C" Circuit Range/Performance) is: Degraded NTC thermistor with shifted resistance curve from thermal stress
Typical repair costs for P0BD2 range from $250 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Inaccurate temperature data from one inverter zone can lead to either unnecessary power derating (false high readings) or undetected overheating (false low readings). The IGBT power modules in the affected zone may operate outside their safe thermal envelope without the control module's awareness.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BD2 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Powertrain - Drive Motor Inverter
Difficulty
Type
Generic (SAE)
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