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OBD Code P2535

Ignition Switch On/Start Position Circuit High

CodeP2535
DescriptionIgnition Switch On/Start Position Circuit High
SystemComputer

What Does P2535 Mean?

Ignition Switch On/Start Position Circuit High. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the computer.

Code Breakdown

P = Powertrain code

2 = Manufacturer-specific

How to Fix P2535

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check the ECM/PCM power and ground circuits for proper voltage.
  2. Inspect all ECM connectors for corrosion, bent pins, or water intrusion.
  3. Check for TSBs regarding ECM software updates for your vehicle.
  4. Verify battery voltage is stable (12.4V+ at rest, 13.5-14.5V running).
  5. If the code indicates an internal ECM failure, the ECM may need to be replaced and reprogrammed by a dealer.
  6. Clear codes and monitor for recurrence.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P2535 serious?

The severity depends on the underlying cause. Some triggers for P2535 are minor (like a loose gas cap), while others may indicate a more significant problem. We recommend having the code diagnosed with a proper scan tool to determine the exact cause before deciding on urgency.

Can I clear P2535 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return, usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P2535?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool, not just reading the code, is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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