P0BD4Drive Motor Inverter Temperature Sensor C 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
- P0BD4 reports a voltage from inverter temperature sensor C above its valid range. For GM's NTC sensor this is an implausibly cold inverter, typically caused by an open circuit, a lost ground or a cracked element. To avoid false alarms on a cold day GM waits until the inverter has run at least 90 s at 20 Nm or more. The 2016 Volt and a 2018 table then set 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 and 2016 ELR use below -58 °C, Type A; the 2012 and 2013 tables below -40 °C, two trips. Until the reading is valid the controller protects the inverter with substitute values and may cut motor power.
- What you may notice
- Malfunction indicator lamp, depending on model after two trips
- Reduced electric drive power
- 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.