Code Definition

P0505 — Idle Control System Malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0505

P0505 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0505 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The DTC P0505 indicates a malfunction in the idle control system of the vehicle. This system is responsible for maintaining a stable idle speed, ensuring smooth engine operation when the vehicle is stationary or moving at low speeds. A malfunction in this system can lead to erratic or rough idling, stalling at idle, or an inability to maintain a consistent idle speed.

Quick Facts