P0511Idle Control

Idle Air Control Circuit

P0511 indicates a general fault in the idle air control valve circuit. It can be a failed IAC valve, wiring or connector problems, or carbon buildup jamming the valve.

🚗 Often drivable, but idle instability and stalling are possible. Have it inspected soon.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Failed idle air control valve$60-$300

40%

A worn or seized IAC motor sets the circuit fault.

#2Wiring or connector fault$40-$250

30%

Broken wire, short, or corroded connector at the IAC valve.

#3Carbon buildup jamming the valve$20-$150

20%

Deposits prevent the valve from moving freely.

#4PCM driver fault$200-$900

10%

Rarely, the PCM output driver has failed.

🩺 Common Symptoms

Rough or hunting idle
Stalling at stops
Check engine light
Hard start

💰 Repair Cost: DIY vs Shop

DIY Cost

$20-$300

Shop Cost

$100-$450

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P0511

1Inspect and clean the IAC valve and passages

2Check the wiring and connector

3Test the valve resistance and operation

4Replace the valve if it is failed

❓ Frequently Asked Questions

Can I drive with P0511?

Often yes, but a stalling idle is unsafe in traffic. Repair it soon.

How much to fix P0511?

Cleaning may be under $100; a new IAC valve is $100-$450 installed.

Is P0511 serious?

Medium severity. It is a drivability issue, not usually a safety-critical one unless it stalls.

🔗 Related Codes

P0505P0507P0508P0509