P1506 - Idle Air Control Overspeed Error

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
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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?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1506 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 Information for specific makes
P1506 AUDI Closed Throttle Position Switch Does Not Open./Short To Ground
P1506 BMW Idle Speed Control Valve Open Solenoid Control Circuit Signal High
P1506 FORD Idle Air Control Overspeed Error  P1506 Video
P1506 HYUNDAI Idle Speed Control Actuator Signal High
P1506 JAGUAR Idle Air Control Overspeed Error
P1506 KIA Idle Air Control Valve Opening Coil Voltage High
P1506 LINCOLN Idle Air Control Overspeed Error
P1506 MAZDA Idle Air Control Overspeed Error
P1506 MERCURY Idle Air Control Overspeed Error
P1506 MINI Idle Speed Control Valve Open Solenoid Control Circuit Signal High
P1506 MITSUBISHI Idle Control System RPM Lower Than Expected At Low Temperature
P1506 VOLKSWAGEN Closed Throttle Position Switch Does Not Open./Short To Ground
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard What does this mean?
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