P2531Ignition Switch Run Position Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- The engine module logs P2531 if the run-position input stays low although the vehicle state says the ignition is on, for example while the engine runs or the network reports run. The supply side is the usual suspect: an open fuse, a relay that does not pull in, a wire grounded on the body or a switch contact that no longer carries current. The module then behaves as if the key were turned off and may start shutting down. Ford's 2014 BOSS 302S code table is the one public manufacturer listing; there P2531 carries the M marker, so Ford lights the MIL for it, unlike the neutral P2530 and the high-side P2532. No thresholds are published. Drivers may face a stall, a restart problem or several warning lamps at once.
- What you may notice
- MIL on
- Engine stalls or will not restart
- Several warning lamps or communication codes at once
- Likely causes
- LikelyOpen fuse in the run circuit
- PossibleRun signal wire shorted to ground
- PossibleRun relay not closing
- Repair
- Medium · Often possible to do yourself.Typical cost: €10 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.