What Does P0BD8 Mean?
DTC P0BD8 indicates the drive motor inverter temperature sensor "D" circuit is reading below the minimum expected voltage threshold. The PCM interprets this low signal as an abnormally cold or shorted-to-ground condition that is not physically plausible. This typically points to a wiring fault or sensor failure causing the signal to be pulled low.
Safety Warning
A low circuit reading may cause the PCM to believe the inverter is extremely cold and disable thermal protection strategies. This could lead to undetected overheating of inverter power electronics, or conversely trigger unnecessary power derating.
Common Causes
35%
Short to ground in the sensor D signal wire
30%
Internally shorted inverter temperature sensor D
18%
Corroded or water-intruded connector causing low-resistance path to ground
12%
Damaged wiring harness pinched against the inverter housing
5%
Failed PCM input circuit (internal short)
Diagnostic Steps
1
Check sensor D live data on the scan tool; a reading pegged at minimum temperature or minimum voltage confirms the low circuit condition.
2
Disconnect the sensor D connector and measure the signal voltage at the PCM side; it should pull high with the sensor disconnected.
3
Inspect the wiring harness from the sensor to the PCM for chafing, bare wires, or contact with metal components that could cause a short to ground.
4
Measure sensor resistance with an ohmmeter; a near-zero reading confirms an internally shorted sensor.
5
Check the connector pins for corrosion, moisture, or bent terminals that could short signal to ground.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
DTC P0BD8 indicates the drive motor inverter temperature sensor "D" circuit is reading below the minimum expected voltage threshold. The PCM interprets this low signal as an abnormally cold or shorted-to-ground condition that is not physically plausible. This typically points to a wiring fault or se...
The most common cause of P0BD8 (Drive Motor Inverter Temperature Sensor "D" Circuit Low) is: Short to ground in the sensor D signal wire
Typical repair costs for P0BD8 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A low circuit reading may cause the PCM to believe the inverter is extremely cold and disable thermal protection strategies. This could lead to undetected overheating of inverter power electronics, or conversely trigger unnecessary power derating.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BD8 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electric Drive Motor / Inverter
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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