P0AF2 code meaning
Drive Motor Inverter Temperature Sensor B Circuit
Powertrain system Generic code P0Axx codes Check engine light
What P0AF2 means
Inverter temperature sensor B is, in GM's hybrid tables, the phase U thermistor of the second inverter, the one that drives motor B in two-motor systems. P0AF2 is its general circuit code for an electrical fault that the controller does not narrow down to low, high or erratic. No manufacturer documents this exact code publicly; GM's tables report the specific siblings P0AF3, P0AF4 and P0AF5 instead. CARB requires monitoring of hybrid components and their sensor circuits. Without a valid temperature the controller cannot protect the power switches of inverter B and usually limits that motor's torque. Whether a vehicle uses sensor B at all depends on its layout, so read the full code list and check the inverter connectors.
P0AF2 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P0AF2
- Hybrid system warning or check engine lamp
- Reduced electric drive or generator power
- Higher fuel consumption in hybrid operation
Common causes of P0AF2
- Most likelyInternal fault of the sensor inside the power inverter module
- PossibleCorroded or loose connector at the inverter module
- Less likelySoftware fault in the motor control processor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor inverter temp sensor bHybrid control moduleWiring harness
What each part of P0AF2 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| F2 | The exact fault in that area. |
What to do next
- Note P0AF2 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0AF2
What does P0AF2 mean?
P0AF2 means "Drive Motor Inverter Temperature Sensor B Circuit". Inverter temperature sensor B is, in GM's hybrid tables, the phase U thermistor of the second inverter, the one that drives motor B in two-motor systems. It is a generic code, so it means the same on every make.
Is it safe to drive with P0AF2?
Drive gently and only to a workshop. With P0AF2 the car can go into limp mode (reduced power) to protect itself.
Will P0AF2 fail an emissions test?
Yes, it can. P0AF2 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0AF2 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0AF2 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.