What Does P0BD9 Mean?
DTC P0BD9 indicates the drive motor inverter temperature sensor "D" circuit is reading above the maximum expected voltage threshold. The PCM detects a signal that implies an impossibly high resistance or open circuit condition in the sensor. This high circuit fault typically suggests a broken wire, disconnected sensor, or open-circuit sensor element.
Safety Warning
A high circuit condition causes the PCM to read an exaggerated inverter temperature, likely triggering power derating or complete electric drive shutdown. While this is a fail-safe response, unexpected loss of propulsion power in traffic is a safety concern.
Common Causes
32%
Open circuit in the sensor D signal or ground wire
28%
Disconnected or backed-out connector pin at sensor D
22%
Failed inverter temperature sensor D (open element)
12%
Corroded connector causing high-resistance open condition
6%
PCM connector fault or internal open on the input circuit
Diagnostic Steps
1
Check sensor D live data; a reading pegged at maximum temperature or maximum voltage confirms the high circuit condition.
2
Inspect the sensor D connector for backed-out pins, broken locking tabs, or disconnected harness plugs.
3
Perform a continuity test from the sensor connector to the PCM connector on both the signal and ground wires to rule out an open circuit.
4
Measure sensor resistance; an infinite (OL) reading indicates an open sensor element requiring replacement.
5
Check for corrosion or oxidation at connector terminals that could create a high-resistance open condition.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
DTC P0BD9 indicates the drive motor inverter temperature sensor "D" circuit is reading above the maximum expected voltage threshold. The PCM detects a signal that implies an impossibly high resistance or open circuit condition in the sensor. This high circuit fault typically suggests a broken wire, ...
The most common cause of P0BD9 (Drive Motor Inverter Temperature Sensor "D" Circuit High) is: Open circuit in the sensor D signal or ground wire
Typical repair costs for P0BD9 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A high circuit condition causes the PCM to read an exaggerated inverter temperature, likely triggering power derating or complete electric drive shutdown. While this is a fail-safe response, unexpected loss of propulsion power in traffic is a safety concern.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BD9 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electric Drive Motor / Inverter
Difficulty
Type
Generic (SAE)
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