OBD-II code · Powertrain (generic, extended)
P2534 Ignition Switch On/Start Position Circuit Low
The On/Start input reads stuck low — short to ground or permanently closed contact. The ECM may see crank request when the key is at rest, blocking accessory functions or causing unexpected starter cut-off logic.
Is it safe to drive with P2534?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOn/Start wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
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.