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P0505 is a diagnostic trouble code (DTC) for "Idle Control System Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $69.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Idle Control System Malfunction
P0505 is an OBD-II generic code that the engine control module (ECM) determined the engine idle control system is not managing the idle to stay in specification. The idle is too high or goes too low.
The idle air control (IAC) valve is carboned up and sticks or has limited control due to the carbon build up.
The IAC passages are clogged or restricted with dirt, debris or carbon build up.
The engine has a vacuum leak in the intake system after the throttle body that the ECM cannot control with the IAC.
Scans codes and documents the code in the ECM, clears and verifies the code
Monitors the engine idle to see if it stays within specifications in and out of gear and on road test
Checks the engine for vacuum leaks
Checks the engine for carbon build up on throttle plates and IAC valve inlet
Disconnects the IAC to see if the engine base idle is within specifications
Removes the IAC and check for blockage of passages
Code P0505 is an indication the IAC is not working correct and it can cause the engine to idle too low or high and the engine may stall when coming to a stop.
The Check Engine Light being on causes the vehicle to fail emission testing.
The code may be from the engine has a vacuum leak and this can cause the engine to run rough and have poor fuel mileage.
Code P0505 is for erratic idle and lack of idle control. The most common problem is a vacuum line to one of the intake or throttle body ports.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.