P0BDADrive Motor Inverter Temperature Sensor D Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0BDA covers an inverter temperature sensor D signal that changes in steps or drops out briefly. Real temperatures of a liquid-cooled inverter move smoothly, so such jumps suggest a contact problem or interference from the high-voltage switching, which a Hitachi patent on inverter systems names as a typical disturbance of the small sensor signal. No manufacturer documents this exact code publicly; GM's tables cover sensor D, the second sensor of the motor B inverter, only with P0BD7, P0BD8 and P0BD9. CARB requires hybrid sensor inputs to be monitored for erratic behaviour as well. Because the fault comes and goes, freeze-frame data and live data during a wiggle test are the most useful clues.
- What you may notice
- Warning lamp that comes and goes
- Brief power reductions while driving
- Jumping inverter temperature in live data
- Likely causes
- LikelyLoose or corroded contact at the inverter module
- PossibleIntermittent fault inside the power inverter module
- RareInterference from the high-voltage circuit on the sensor signal
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.