Faulty inverter temperature sensor C internal failure; Damaged or chafed wiring harness between the sensor and the control module; Corroded, loose, or pushed-back terminals at the sensor or module connector; Short to ground in the signal circuit; High resistance in the ground circuit for the sensor; Failed control module driver for the sensor circuit (less common); Coolant intrusion or contamination affecting the sensor element

DTC codes / P0Bxx · Hybrid propulsion / P0BD3

P0BD3Drive Motor Inverter Temperature Sensor C Circuit Low

Q: What does code P0BD3 mean?

Drive Motor Inverter Temperature Sensor C Circuit Low. P0BD3 indicates that the powertrain control module has detected an abnormally low voltage signal on the temperature sensor circuit for the drive motor inverter, specifically the channel designated as Sensor C. This sensor monitors the inverter's operating temperature, and a low signal means the circuit is likely shorted to ground, has excessive resistance, or the sensor itself has failed.

P0BD3 indicates that the powertrain control module has detected an abnormally low voltage signal on the temperature sensor circuit for the drive motor inverter, specifically the channel designated as Sensor C. This sensor monitors the inverter's operating temperature, and a low signal means the circuit is likely shorted to ground, has excessive resistance, or the sensor itself has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or service vehicle soon message, often with no other symptoms
Reduced power output or limp mode as the inverter derates to protect itself from perceived overheating
Inconsistent or inaccurate temperature readings on a scan tool data stream
Possible shutdown of the hybrid or electric drive system if the fault escalates
In rare cases, a burning smell or visible coolant leak near the inverter if the sensor is exposed to extreme conditions

Common causes, most likely first

Faulty inverter temperature sensor C internal failure
Damaged or chafed wiring harness between the sensor and the control module
Corroded, loose, or pushed-back terminals at the sensor or module connector
Short to ground in the signal circuit
High resistance in the ground circuit for the sensor
Failed control module driver for the sensor circuit (less common)
Coolant intrusion or contamination affecting the sensor element

How to diagnose and fix it

Connect a scan tool and record the freeze-frame data and sensor voltage to confirm the low signal condition
Visually inspect the sensor connector and wiring for damage, corrosion, or loose pins
Measure the sensor resistance and compare it to the manufacturer's specification for the current temperature
Backprobe the signal circuit at the sensor and at the control module to check for a short to ground or excessive voltage drop
Perform a wiggle test on the harness while monitoring the sensor voltage to reveal intermittent faults
If the circuit tests good, replace the inverter temperature sensor and clear the code
If the sensor and wiring are intact, diagnose the control module and repair or replace as needed

When the sensor is not the culprit

A low signal code often results from a short to ground in the wiring harness where it rubs against a bracket or passes through a tight grommet, so inspect the entire run before condemning the sensor.
The inverter temperature sensor may share a ground circuit with other sensors, and a bad ground can cause multiple temperature-related codes to set simultaneously, so check for companion codes.
On some vehicles, the sensor is integrated into the inverter assembly and cannot be replaced separately, requiring replacement of the entire unit if the sensor fails.
A low coolant level or air pocket in the inverter cooling system can cause the sensor to read incorrectly and set this code, so verify coolant condition and bleed the system after repairs.
The code can be set by a momentary glitch during a low-voltage event such as a weak 12-volt battery, so clear the code and see if it returns before replacing parts.

Can I keep driving with P0BD3?

You can usually drive the vehicle short distances at reduced power to reach a repair shop, but avoid sustained high-speed driving or heavy loads because the inverter may overheat without a valid temperature signal. If the vehicle enters limp mode or shuts down, stop driving and arrange a tow.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.