P0AF1Drive Motor Inverter Temperature Sensor A 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
- P0AF1 is meant for an inverter temperature sensor A signal that jumps or drops out briefly instead of failing permanently. Inverter heat sinks are liquid-cooled and change temperature smoothly, so sudden steps point to a contact problem or an internal fault in the sensing circuit. No manufacturer documents this exact code publicly; GM's hybrid tables cover sensor A only with the plausibility, low and high codes P0AEE, P0AEF and P0AF0. GM's method for erratic battery sensors, such as P0AEC, sums signal changes over 10-sample windows and fails after 4 of 5 bad windows, which shows how such a check usually works. CARB requires hybrid sensor inputs to be monitored for this kind of fault. Freeze-frame data help, since the fault often comes and goes.
- What you may notice
- Warning lamp that comes and goes
- Brief power reductions while driving
- 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.