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OBD Code P1586

Cruise Control Brake Switch 2 Circuit (Buick)

CodeP1586
DescriptionCruise Control Brake Switch 2 Circuit (Buick)
SystemFuel System

What Does P1586 Mean?

Cruise Control Brake Switch 2 Circuit (Buick). This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the fuel system.

Code Breakdown

P = Powertrain code

1 = Manufacturer-specific

How to Fix P1586

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

  1. Read freeze frame data to understand the conditions when the code was set.
  2. Inspect related sensors and wiring per the specific code description.
  3. Check engine oil level and condition — low oil or wrong viscosity can trigger engine codes.
  4. Inspect vacuum hoses and the intake manifold for leaks.
  5. Check for related TSBs from the manufacturer for your specific engine.
  6. Repair or replace the component indicated by the code.
  7. Clear codes and drive through a complete drive cycle to verify the repair.

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 P1586 serious?

The severity depends on the underlying cause. Some triggers for P1586 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 P1586 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 P1586?

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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