P0AF3Drive Motor Inverter Temperature Sensor B Circuit Range/Performance
- 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
- P0AF3 is the plausibility test for inverter temperature sensor B, the phase U sensor of GM's motor B inverter. In the 2016 to 2019 tables the sensor is compared after a cold soak with a calculated average vehicle temperature; a difference above 20 °C sets the code, Type B, two trips. The 2011 Volt compares it with the other power electronics sensors at 20 °C, Type A, and the 2011 and 2013 two-mode trucks after 360 minutes off at 15 °C, Type B. GM bulletin PIC6303A lists P0AF3 with P0AEE and the other inverter thermistor codes on 2016-18 Volt, Malibu, LaCrosse and Regal with the 5ET50 drive: alone they cause no noticeable effect, and the inverter is replaced only if P0AC4 set at the same time.
- What you may notice
- Malfunction indicator lamp after two trips
- Often no noticeable drivability change
- Further inverter temperature codes may be stored
- Likely causes
- PossibleInverter temperature sensor B drifting out of tolerance
- PossibleFailing power inverter module
- RareUneven inverter coolant flow after soak
- 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.