Technical Definition:
Idle Air Control System
Trouble Code: P0505
Address: 0x0505
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Address: 0x0505
System: Powertrain
Subsystem: Vehicle Speed Control, Idle Controls, and Auxiliary Inputs
Technical Description:
Possible Causes:
- IAC motor connector is damaged
- One or more IAC circuits open or shorted to ground
- One or more IAC circuits are shorted to voltage
- IAC has failed
- PCM has failed
Possible Symptoms:
- MIL (Malfunction Indicator Lamp) illumination
- Engine stalls and may not idle unless throttle is depressed
- Intermittently stalls when letting off the throttle
- Engine may idle too high
Idle Control System Malfunction
Possible Solutions:
OBD-II Trouble Code Type:
Diagnostic Step:
Tech Notes:
– Faulty IACV-AAC valve
– IACV-AAC valve harness is open or shorted
– IACV-AAC valve circuit poor electrical connection
Specific Makes:
– Engine hard to start
– Rough or erratic idle speed