P0505 Idle Control System

Powertrain Severity: Moderate Generic OBD-II

The idle control system is not working as expected.

Common causes

  • Dirty throttle body or idle valve
  • Vacuum leak
  • Faulty idle control valve

Symptoms

  • Unstable idle
  • Stalling
  • High idle

What to check

  1. Clean the throttle body
  2. Check for vacuum leaks
  3. Perform an idle relearn if required

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0505, follow the service information for that make and model.

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