What it means
The ECM detects a circuit intermittent/erratic fault on the drive motor inverter temperature sensor d circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Inverter temperature sensor D measures temperature at its point in the drive motor inverter and sends the signal to the ECM. P0BDA sets when that D circuit signal becomes erratic or drops out intermittently, rather than staying consistently low or high, leaving the ECM without a dependable temperature reading.
Common causes
Most likely first.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Check freeze-frame and fault history for when the D reading became erratic, including whether it coincided with vibration, acceleration, or inverter heating.
- Inspect sensor D's connector for an incomplete latch, loose terminals, corrosion, or wiring that can move against nearby components.
- Monitor sensor D live data while gently checking accessible harness sections for a signal dropout, following the manufacturer's safety procedure.
- Check the D circuit's ground reference and connector contact stability for intermittent disturbance using the manufacturer's test method.
- If the wiring remains stable, test sensor D for intermittent output faults against the manufacturer's specification.
Common fixes
- Fully seat and latch the sensor D connector; clean or repair loose or corroded terminals.
- Secure or repair wiring that moves, chafes, or loses contact with vibration.
- Repair an unstable ground reference in the D sensor circuit.
- Replace sensor D if its output remains intermittent with a sound circuit.
Can I keep driving?
Limit driving because the fault can cause sudden motor-power reduction or limp mode when the D signal drops out. Avoid high-speed or high-load trips, and stop safely if the vehicle warns of a hybrid-system fault or begins losing power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.