P0BD5Drive Motor Inverter Temperature Sensor C 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
- P0BD5 is meant for an inverter temperature sensor C signal that jumps or drops out for short moments. Because the heat sink of a liquid-cooled inverter changes temperature smoothly, sudden steps point to a contact fault or to interference; a Hitachi patent explains that the small thermistor signal can pick up noise from the high-voltage main circuit. No manufacturer documents this exact code publicly; GM covers its sensor C, the phase V sensor of the motor A inverter, only with P0BD2, P0BD3 and P0BD4. CARB requires hybrid sensor inputs to be monitored for erratic faults too. Freeze-frame data and a careful check of the inverter connector are the best starting points.
- 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.