Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 34
Possible causes
- On/Start wire shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: ignition switch
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012