Vacuum Leak Found IAC At Max
2007-2011 Dodge Nitro 3.7L V6
Description
The PCM has determined that the idle air control motor is at its maximum closed position but the engine idle is still too high. This strongly indicates a vacuum leak is allowing unmetered air into the engine.
Symptoms
- Check Engine Light
- High idle speed
- Idle does not come down
- Rough idle
- Hissing sound from engine bay
Common Causes
- Vacuum hose cracked or disconnected
- Intake manifold gasket leak
- Throttle body gasket leak
- Brake booster vacuum leak
- PCV valve or hose leak
Diagnostic Steps
- Perform smoke test on intake system to locate vacuum leak
- Inspect all vacuum hoses for cracks or disconnections
- Check intake manifold gasket area with carb cleaner spray
- Test brake booster vacuum hose
- Inspect PCV system
Repair Notes
Locate and repair the vacuum leak that is causing the high idle condition.
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
P1299 on Other Vehicles
Common Questions
What does code P1299 mean on a 2007-2011 Dodge Nitro?
P1299 stands for "Vacuum Leak Found IAC At Max". The PCM has determined that the idle air control motor is at its maximum closed position but the engine idle is still too high. This strongly indicates a vacuum leak is allowing unmetered air into the engine.
What are the symptoms of P1299 on a Dodge Nitro?
Common symptoms of P1299 include: Check Engine Light, High idle speed, Idle does not come down, Rough idle, Hissing sound from engine bay.
What causes P1299 on a 2007-2011 Dodge Nitro?
Common causes of P1299 include: Vacuum hose cracked or disconnected, Intake manifold gasket leak, Throttle body gasket leak, Brake booster vacuum leak, PCV valve or hose leak.