Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0505 Idle Control System Malfunction: Description
The idling speed is controlled by the ETCS (Electronic Throttle Control System). The one valve type throttle body ETCS is comprised of: 1) the throttle actuator, which operates the throttle valve; 2) the Throttle Position (TP) sensor, which detects the opening angle of the throttle valve; 3) the Accelerator Pedal Position (APP) sensor, which detects the accelerator pedal position; and 4) the ECM, which controls the ETCS. Based on the target idling speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0505 | Idling speed continues to vary greatly from target idling speed (2 trip detection logic) |
|
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.