OBD-II code · Powertrain (generic, extended)
P2531 Ignition Switch Run Position Circuit Low
The ignition switch Run-position input reads stuck low — short to ground or a permanently closed contact. The ECM cannot tell when the operator releases the switch from Run, so accessory and crank logic gets confused.
Is it safe to drive with P2531?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyRun input wire shorted to ground
- PossibleSwitch contact stuck closed
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Ignition Switch, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.