What usually causes it
- A dirty throttle body or idle air valve
- A vacuum leak
- A sticking or failing throttle motor
- A stuck PCV valve, the small valve that vents engine fumes, or a dirty air flow sensor
P0505Starts at: OK to drive, fix when convenient
Idle control system problem
Idle is the engine speed when the car is stopped. The computer cannot hold the idle where it wants it.
Check this first
Look for cracked or loose rubber hoses near the engine. Cleaning the throttle body with a spray made for it often helps.
What to watch for
- The idle surges up and down
- The engine stalls when you stop
- A very rough idle when the A/C is on
Can I keep driving?
We rate P0505 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
Quick answers about P0505
What does P0505 mean?
Idle control system problem. Idle is the engine speed when the car is stopped. The computer cannot hold the idle where it wants it.
Can I keep driving with P0505?
We rate P0505 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
What usually causes P0505?
The most common causes, in order: A dirty throttle body or idle air valve; A vacuum leak; A sticking or failing throttle motor; A stuck PCV valve, the small valve that vents engine fumes, or a dirty air flow sensor.
Estimates only. A mechanic should confirm. The same code can mean slightly different things on different cars; the app explains it for your exact year, make, model and mileage.