StopOrDrive

Enter a 5-character code such as P0420, P0301, or P0457.

We don't have that code yet

Codes starting with P are engine and transmission, B are body, C are chassis, and U are network communication. A 0 as the second character means a generic code shared by all makes; a 1 means a manufacturer-specific code, so its meaning depends on your brand.

A steady check engine light usually means get it checked soon. A flashing check engine light means an active misfire: reduce speed and stop driving as soon as it is safe.

That doesn't look like an OBD-II code

A valid code is one letter (P, B, C, or U) followed by four characters, for example P0420.

P0505 Idle air control system malfunction

Can I drive with P0505?

Drive with caution

Stop if the engine stalls, hesitates or won't restart.

Idle can surge, or the engine can stall when you come to a stop.

What does P0505 mean?

The engine computer can't hold the idle speed where it wants it.

What causes P0505?

  1. Dirty throttle body
  2. Faulty idle air control valve
  3. Vacuum leak
  4. Wiring problem

How much does it cost to fix P0505?

$100 – $450

Throttle body cleaning: $100–$150. Idle air control valve: $150–$400.

Confirm the code yourself

A low-cost scanner lets you read the code, clear it, and see if it comes back before paying for a diagnosis.

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