What does code P0505 mean?

Q: What does code P0505 mean?

Idle Control System Malfunction. P0505 means the engine computer has detected that the idle speed is outside the range it expects and cannot be corrected through the idle control system. The computer commands the idle air control valve or electronic throttle to adjust airflow, but the resulting engine speed does not match the target idle, so it flags the circuit or system as malfunctioning.

DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P0505

P0505Idle Control System Malfunction

P0505 means the engine computer has detected that the idle speed is outside the range it expects and cannot be corrected through the idle control system. The computer commands the idle air control valve or electronic throttle to adjust airflow, but the resulting engine speed does not match the target idle, so it flags the circuit or system as malfunctioning.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.