What it means
The ECM detects a circuit intermittent/erratic fault on the drive motor inverter temperature sensor e 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 E measures temperature at its monitored point in the drive motor inverter and sends that signal to the ECM. P0BDF sets when the E circuit signal is intermittent or erratic, such as from a loose connector or unstable ground reference, rather than consistently outside its range.
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 sensor E dropouts and note whether they occurred with vibration, load changes, or inverter heating.
- Inspect the E connector latch, terminals, ground path, and harness for movement, corrosion, or chafing.
- Watch sensor E live data while gently moving accessible wiring sections, using the manufacturer's safety procedure, and look for sudden dropouts.
- Test the E circuit's ground reference and connector contact stability using the manufacturer's procedure.
- If the circuit remains stable, test sensor E for an intermittent output fault against the manufacturer's specification.
Common fixes
- Seat and latch the E connector; clean or repair loose or corroded terminals.
- Secure or repair harness sections that move or chafe and interrupt the E signal.
- Repair an unstable ground reference in the E sensor circuit.
- Replace sensor E if its output is erratic with a verified sound circuit.
Can I keep driving?
A sudden signal dropout can prompt reduced motor power or limp mode, so avoid long trips and high-load driving until the fault is addressed. Stop safely if a hybrid-system warning appears with loss of 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.