P2535 — Ignition Switch On/Start Position Circuit High

What Does P2535 Mean?

P2535 is a diagnostic trouble code indicating: Ignition Switch On/Start Position Circuit High. This code relates to the powertrain system. It has been reported in NHTSA complaints across 1 different vehicle models.

Common Causes

🔍 Weak or failing fuel pump

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"This vehicle is owned by the City of Fort Lauderdale Police Department. We are submitting complaints for multiple Tahoe's that have stopped during operation causing extreme danger to our staff and other drivers in the city. The cause is always bad fuel pumps and our units have had to have the pumps"
— Chevrolet Tahoe owner, 04/02/2024

Source: NHTSA Complaints Database

Most Reported Vehicles for P2535

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	CHEVROLET TAHOE

Frequently Asked Questions

Can I drive with this code?

It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.

Will this code clear itself?

Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.

How do I find the exact cause?

A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P2535: Ignition Switch On/Start Position Circuit High