P2AF3Starter Relay C Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2AF3 sets when the control line of starter relay C is pulled toward ground at a moment the module expects a different level. What that does to the relay depends on the driver type: with ground-side switching the short acts like a permanent on command, with supply-side switching the coil never gets current. No manufacturer publishes a set condition for P2AF3. Stellantis uses relay C as Starter Relay 3, the battery isolation relay of its stop-start Jeep and RAM models, where an energised coil splits the two batteries; only the stuck codes of that relay appear in its bulletins. GM's comparable short-to-ground test on the tandem starter pinion relay (P26E5) looks for 0.5 Ω or less to ground with 8 failures in 10 samples, Type B. Open and short-to-voltage faults are P2AF2 and P2AF4.
- What you may notice
- Stop-start inoperative
- Relay energised all the time or not at all, depending on circuit design
- Possible no-crank
- Likely causes
- LikelyControl wire chafed through to ground
- PossibleShorted 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.