P0511
Idle Air Control Circuit
P0511 is an OBD-II diagnostic trouble code meaning: Idle Air Control Circuit. Common causes: faulty idle air control (iac), open or shorted in iac control circuit. Estimated repair cost: $33–133.
Symptoms
- Check Engine Light Is On
- Unstable idle (speed jumps)
- Engine stalls when braking or stopping
- Idle speed too high or low
- Poor response when turning on the air conditioner
Causes
- Faulty idle air control (IAC)
- Open or shorted in IAC control circuit
- Oxidation or contamination of the IAC connector
- IAC valve clogged with deposits
- ECU malfunction
How to Fix
- Read error codes with scanner
- Find the idle air control according to the diagram (usually on the throttle assembly or nearby)
- Check the supply voltage and control signals at the IAC connector
- Measure the resistance of the windings IAC (compare with the norm)
- Inspect IAC valve for blockage and clean
- Check wiring for breaks and shorts
- Replace IAC if parameters do not match
- Reset the error and check the idle speed in different modes
Related codes
Error P0511 by Vehicle Brand
FAQ
What does the P0511 code mean?
P0511 is an OBD-II diagnostic trouble code that indicates: Idle Air Control Circuit
What causes a P0511 error code?
The most common causes of P0511 include: Faulty idle air control (IAC); Open or shorted in IAC control circuit; Oxidation or contamination of the IAC connector; IAC valve clogged with deposits.
How do I fix a P0511 diagnostic trouble code?
To fix P0511: Read error codes with scanner. Find the idle air control according to the diagram (usually on the throttle assembly or nearby). Check the supply voltage and control signals at the IAC connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0511?
Yes, but get it checked soon
How much does it cost to fix P0511?
The estimated repair cost for P0511 is $33–133. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat