P0AF5Drive Motor Inverter Temperature Sensor B 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
- P0AF5 means inverter temperature sensor B delivers a voltage above its valid range. For GM's NTC sensor that equals an implausibly cold inverter, so an open circuit, a lost ground or a cracked thermistor is likely. In GM's 2016 to 2019 tables the code sets below -50 °C for 2.6 of 3.65 s, but only once the inverter has run at least 90 s at 20 Nm or more, which rules out a genuinely cold start; Type B, two trips. The 2011 Volt uses below -58 °C with Type A, one trip; the 2011 and 2013 two-mode trucks use below -40 °C, Type B. Until the value is valid, the controller protects inverter B with substitute values and may reduce motor B power. Check connectors at the inverter before condemning the unit.
- What you may notice
- Malfunction indicator lamp after two trips
- Reduced motor B power
- Implausibly cold 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 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.