P2AF2Starter Relay C Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2AF2 reports an open or otherwise faulty control line for a third starter relay. Such a relay appears where cranking is split across several switching stages, for instance on stop-start engines. No manufacturer documents P2AF2 publicly. The nearest documented user of relay C is Stellantis, which calls it Starter Relay 3: on Jeep and RAM stop-start models it is the power control relay that cuts the main battery off from the auxiliary one during an auto-start, yet published bulletins only cover its stuck codes P2AF5 and P2AF6. As an analogy for the circuit test, GM treats its tandem starter pinion relay output (P26E4) as open at 200 kΩ or more between signal and ground, after 40 failures in 50 samples of 50 ms, Type B. Shorts to ground and to voltage are P2AF3 and P2AF4.
- What you may notice
- Stop-start function disabled
- Occasional or permanent no-crank
- Warning lamp depending on manufacturer
- Likely causes
- LikelyBroken control wire or unplugged relay connector
- PossibleOpen relay coil
- PossibleBlown fuse or missing supply to the relay coil
- RareFaulty output driver in the control module
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.