Is it safe to drive with a P0506 code?

Severity is medium. Address P0506 sooner rather than later — driving with an active check engine light can worsen the problem or void emissions warranties.

How much does it cost to fix P0506?

Repair costs for P0506 typically range from $10 to $250 in the US, depending on the underlying cause. The most common fix is: Carbon buildup in IAC valve / throttle body.

What are the symptoms of P0506?

Low idle. Stalling at stops. Hard restart. Rough idle.

Check Engine Code

P0506

Idle Air Control System RPM Lower Than Expected

Severity: medium DIY difficulty: 2/5 Typical cost: $10–$250

Last updated April 30, 2026

What P0506 means

Counterpart to P0507. The engine is idling lower than expected, often because something is restricting airflow — clogged IAC, gummed throttle body, or a vacuum-supply problem.

Symptoms

Low idle
Stalling at stops
Hard restart
Rough idle

Likely causes (most common first)

Carbon buildup in IAC valve / throttle body
Failed IAC
Vacuum hose disconnected or blocked
Failed PCV valve
Restricted air filter

Can I keep driving?

Medium — drivable but fix soon

Typical repair cost

DIY fixes can start near $10 (parts only). Shop repairs for P0506 typically run up to $250 depending on the underlying cause and vehicle. Start with the most common cause — Carbon buildup in IAC valve / throttle body — before throwing parts at it.