Idle Air Control Underspeed Error
2009-2012 Ford Flex 3.5L V6 🇩🇪
Description
The engine idle speed is too low. The PCM detects that idle RPM is below the target and the IAC system cannot increase it sufficiently. This code sets when the engine has been running for at least 1 minute and idle speed remains below target.
Symptoms
- Check Engine Light
- Idle speed too low
- Engine stalling at idle
- Rough idle
- Engine dies when coming to a stop
Common Causes
- IAC valve stuck closed or restricted
- Carbon buildup in IAC passage
- Faulty IAC valve
- Dirty throttle body restricting air
- Engine mechanical issue (low compression, vacuum leak)
Diagnostic Steps
- Clean IAC valve and passage
- Clean throttle body
- Test IAC valve operation
- Check for restricted IAC passage
- Check engine mechanical condition if cleaning does not help
Repair Notes
Clean throttle body and IAC valve/passage first. Replace IAC valve if faulty.
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
P1507 on Other Vehicles
Common Questions
What does code P1507 mean on a 2009-2012 Ford Flex?
P1507 stands for "Idle Air Control Underspeed Error". The engine idle speed is too low. The PCM detects that idle RPM is below the target and the IAC system cannot increase it sufficiently. This code sets when the engine has been running for at least 1 minute and idle speed remains below target.
What are the symptoms of P1507 on a Ford Flex?
Common symptoms of P1507 include: Check Engine Light, Idle speed too low, Engine stalling at idle, Rough idle, Engine dies when coming to a stop.
What causes P1507 on a 2009-2012 Ford Flex?
Common causes of P1507 include: IAC valve stuck closed or restricted, Carbon buildup in IAC passage, Faulty IAC valve, Dirty throttle body restricting air, Engine mechanical issue (low compression, vacuum leak).