What it means
The ECM detects a circuit 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 reports temperature at its monitored point in the drive motor inverter to the ECM. P0BDB indicates a general electrical fault in the E sensor circuit, so the ECM cannot use that point's temperature reading reliably to manage the hybrid or EV system.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Read freeze-frame and hybrid control data for sensor E and note whether the fault appears cold, hot, or under load.
- With the vehicle powered down according to the manufacturer's procedure, inspect sensor E's connector and harness for damage, moisture, corrosion, or loose terminals.
- Check the E circuit's signal, reference, ground, and continuity using the manufacturer's wiring information and test procedure.
- Compare sensor E's live reading with other inverter temperature readings to see whether it is missing, fixed, or implausible.
- If the wiring and connections pass, test sensor E against the manufacturer's specification before considering a control-module fault.
Common fixes
- Reseat sensor E's connector and clean or repair corroded or loose terminals.
- Repair damaged wiring or an open connection in the E sensor circuit.
- Replace sensor E if it fails the manufacturer's test.
- Address a control-module fault only after confirming the E sensor and circuit are sound.
Can I keep driving?
A hybrid warning and reduced motor output can occur, and the vehicle may enter limp mode or shut down. Avoid heavy loads and long trips; if power is restricted or a stop warning appears, pull over safely.
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.