P0AF6Drive Motor Inverter Temperature Sensor B 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
- P0AF6 targets an inverter temperature sensor B signal that jumps or drops out briefly. Since the heat sink of the motor B inverter is liquid-cooled and warms or cools gradually, abrupt changes in the reading indicate a contact problem or an intermittent fault in the sensing circuit rather than real temperature. No manufacturer documents this exact code publicly; GM's hybrid tables only list P0AF3, P0AF4 and P0AF5 for sensor B. For erratic battery temperature sensors such as P0AEC, GM sums the signal changes over 10-sample windows and fails after 4 of 5 bad windows, a likely model for this check. CARB requires sensor inputs of hybrid systems to be checked for erratic behaviour. Watch live data while gently moving the inverter harness.
- What you may notice
- Warning lamp that comes and goes
- Brief reductions of motor B power
- Jumping inverter temperature in live data
- Likely causes
- LikelyLoose or corroded connector at the inverter module
- PossibleIntermittent fault inside the power inverter module
- RareElectrical interference 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.