P0BD9Drive Motor Inverter Temperature Sensor D Circuit High
- 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
- P0BD9 means inverter temperature sensor D delivers a voltage above its valid range. For GM's NTC sensor in the motor B inverter that equals an implausibly cold inverter, so an open circuit, a lost ground or a cracked thermistor is likely. GM checks only after the inverter has run at least 90 s at 20 Nm or more, so a real cold start is excluded. The 2016 Volt then sets it below -50 °C for 2.6 of 3.65 s, Type B, two trips; a 2019 table uses -50 °C with Type A; the 2011 Volt below -58 °C, Type A; the 2012 table below -40 °C, two trips. Until the value is valid the controller uses substitute values and may limit motor B. Check the inverter connectors before replacing the unit.
- What you may notice
- Malfunction indicator lamp, depending on model after two trips
- Reduced motor B power and regeneration
- Implausibly low inverter temperature in live data
- Likely causes
- LikelyOpen sensor or circuit inside the power inverter module
- PossibleLoose, corroded or unplugged connector at the inverter
- RareLost sensor ground
- 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.