Code result
P2535
Ignition Switch On/Start Position Circuit High
Moderate severity
What it means
The On/Start input reads stuck high — short to battery voltage. The ECM cannot read the crank state, modules dependent on this signal are unable to time their wake-up correctly.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
On/Start wire shorted to battery voltage
highOne of the most commonly reported causes for this code — check this first.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Supply wire pinched against B+ source
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2535 freeNo credit card required