Faulty inverter temperature sensor C itself, such as an open or shorted thermistor element; Damaged or corroded wiring harness between the sensor and the inverter controller; Loose, backed-out, or contaminated connector terminals at the sensor or controller; Internal fault in the drive motor inverter controller affecting the sensor reference voltage or signal processing; Coolant flow restriction or air pockets causing the sensor to see temperatures outside the expected range; Sensor installation error, such as improper seating or missing thermal paste, leading to poor thermal coupling; Electrical interference or ground offset issues on the sensor signal circuit

DTC codes / P0Bxx · Hybrid propulsion / P0BD2

P0BD2Drive Motor Inverter Temperature Sensor C Circuit Range/Performance

P0BD2 indicates that the drive motor inverter temperature sensor C circuit is reporting a range or performance fault, meaning the voltage signal from that sensor does not correlate with expected values under current operating conditions. The inverter controller compares the sensor's output against a plausibility model and flags this code when the signal stays out of bounds or behaves erratically for a calibrated period.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or a dedicated hybrid/EV warning lamp
Often no symptoms besides the warning light, especially if the fault is intermittent
Reduced power output or limp-home mode triggered by the inverter controller
Possible shutdown of the drive motor inverter to protect power electronics from overheating
Inconsistent or missing temperature readings on a scan tool data stream
In rare cases, a noticeable drop in acceleration or a message to service the hybrid system

Common causes, most likely first

Faulty inverter temperature sensor C itself, such as an open or shorted thermistor element
Damaged or corroded wiring harness between the sensor and the inverter controller
Loose, backed-out, or contaminated connector terminals at the sensor or controller
Internal fault in the drive motor inverter controller affecting the sensor reference voltage or signal processing
Coolant flow restriction or air pockets causing the sensor to see temperatures outside the expected range
Sensor installation error, such as improper seating or missing thermal paste, leading to poor thermal coupling
Electrical interference or ground offset issues on the sensor signal circuit

How to diagnose and fix it

Connect a scan tool and record the freeze-frame data and live sensor C temperature values to confirm the fault is active and not historical
Visually inspect the sensor, its connector, and the wiring harness for chafing, corrosion, or loose pins, and repair any obvious damage
Measure the sensor resistance or voltage at the sensor connector and compare it to the manufacturer's temperature-resistance chart
Back-probe the signal circuit at the inverter controller to check for voltage drop or an open circuit between the sensor and the controller
Verify the inverter coolant level and bleed the cooling system if air pockets are suspected, then recheck sensor readings
If the sensor and wiring test good, substitute a known-good sensor or use a signal simulator to confirm whether the controller or the sensor is at fault
Replace the faulty sensor or inverter controller as indicated by the test results, clear the codes, and verify the repair with a road test

What the inverter temperature sensor C really monitors

This code often sets intermittently due to a poor connector pin tension that only loses contact during temperature swings or vibration, so a wiggle test while watching live data is essential.
A low coolant level or trapped air in the inverter cooling loop can cause the sensor to report a range fault even when the sensor itself is perfectly functional.
Technicians sometimes replace the inverter controller when the real problem is a chafed signal wire behind the motor assembly, so always perform a continuity and load test on the circuit before condemning the controller.
The sensor C circuit may share a reference voltage or ground with other temperature sensors, and a fault in that shared circuit can set multiple related codes that point away from the true cause.
After any repair, the inverter controller may need a relearn or adaptation procedure to clear the learned fault counter, otherwise the code can reappear until the drive cycle completes.

Can I keep driving with P0BD2?

You can usually drive the vehicle short distances at reduced power, but avoid sustained high-speed driving or heavy loads because the inverter may overheat without a valid temperature signal. If the vehicle enters limp-home mode or shows a hybrid system warning, stop safely and arrange a diagnostic scan before continuing.

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.