P0BDF: Drive Motor Inverter Temperature Sensor E Circuit Intermittent/Erratic

What does P0BDF mean?

P0BDF flags an unstable signal from inverter temperature sensor E: the reading jumps or drops out briefly instead of staying out of range, typically from a loose connector, a cracked solder joint or an ageing thermistor. In GM's hybrid tables sensor E is the phase W sensor of the motor A inverter, but GM does not list this erratic code; no manufacturer documents P0BDF publicly. CARB requires hybrid sensor circuits to be checked for circuit faults, which includes intermittent signals. Unlike P0BDD and P0BDE, the value returns to plausible levels between faults, so the code may come and go. Because the controller cannot trust the sensor, it usually reduces motor power while the fault is present.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Malfunction indicator lamp that comes and goes
• Occasional loss of electric drive power

Common causes

• High Loose, corroded or vibrating connector at the inverter
• Medium Cracked solder joint on the inverter sensing board
• Low Ageing thermistor with unstable resistance

Likelihood is a general estimate across vehicles; your make and model may differ.