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

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.

Symptoms

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

Most likely causes

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

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Gently move the wiring with the engine running and watch whether the reading changes.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0BDF means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• B: Subsystem depends on the code range
• DF: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0BDF?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0BDF?

The most common causes are: loose, corroded or vibrating connector at the inverter; cracked solder joint on the inverter sensing board; ageing thermistor with unstable resistance.

Related codes

• P0BDBDrive Motor Inverter Temperature Sensor E Circuit
• P0BDCDrive Motor Inverter Temperature Sensor E Circuit Range/Performance
• P0BDDDrive Motor Inverter Temperature Sensor E Circuit Low
• P0BDEDrive Motor Inverter Temperature Sensor E Circuit High
• P0BD5Drive Motor Inverter Temperature Sensor C Circuit Intermittent/Erratic
• P0BE4Drive Motor Inverter Temperature Sensor F Circuit Intermittent/Erratic

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics
• gsi.ext.gm.com: 16OBDG02 Hybrid Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.