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P1506 FORD - Idle Air Control Overspeed Error

Possible causes
- Faulty Idle Air Control (IAC) valve
- IAC valve harness is open or shorted
- IAC valve circuit poor electrical connection
- Intake leaks
- Stuck PCV Valve
What does this mean? What does this mean?
Tech notes
The P1506 code means that the engine idle is out of factory specification. Sometimes the Idle Air Control (IAC) may have carbon built up. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned.
Also, check for intake leaks or stuck PCV Valve.
If the problem persists, the IAC valve may need to be replaced.





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What does this mean? What does this mean?
When is the code detected?
The P1506 code sets when the Powertrain Control Module (PCM) detects an engine idle speed that is greater than the desired RPM.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1506 Ford Description

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The Powertrain Control Module (PCM) determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine RPM and increases or decreases the IAC duty cycle in order to achieve the desired RPM.

P1506 Ford Information for specific Ford models
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