Idle Air Control Overspeed Error
2009-2012 Ford Flex 3.5L V6 🇨🇦
Description
The engine idle speed is too high. The PCM has detected that idle RPM exceeds the target idle speed and the IAC system cannot bring it down. The engine may be idling at 2000+ RPM.
Symptoms
- Check Engine Light
- Idle speed too high
- Engine races at idle
- Vehicle creeps forward in gear
Common Causes
- Vacuum leak (most common)
- IAC valve stuck open
- Throttle plate not closing fully
- Throttle body carbon buildup preventing closure
- Faulty IAC valve
- Intake manifold gasket leak
Diagnostic Steps
- Check for vacuum leaks with engine running — spray carb cleaner around intake
- Inspect throttle body for carbon preventing plate closure
- Test IAC valve — disconnect and check if idle drops
- Clean throttle body and IAC passages
- Inspect intake manifold gaskets
Repair Notes
Find and repair vacuum leak. Clean throttle body. Replace IAC valve if stuck open.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1506 on Other Vehicles
Common Questions
What does code P1506 mean on a 2009-2012 Ford Flex?
P1506 stands for "Idle Air Control Overspeed Error". The engine idle speed is too high. The PCM has detected that idle RPM exceeds the target idle speed and the IAC system cannot bring it down. The engine may be idling at 2000+ RPM.
What are the symptoms of P1506 on a Ford Flex?
Common symptoms of P1506 include: Check Engine Light, Idle speed too high, Engine races at idle, Vehicle creeps forward in gear.
What causes P1506 on a 2009-2012 Ford Flex?
Common causes of P1506 include: Vacuum leak (most common), IAC valve stuck open, Throttle plate not closing fully, Throttle body carbon buildup preventing closure, Faulty IAC valve, Intake manifold gasket leak.