P0505 on Nissan
Idle Air Control System Malfunction
P0505 on Nissan vehicles indicates idle air control system malfunction. Au7o has documented this code across 1 Nissan model — most commonly on Cube. P0505 indicates a malfunction in the idle air control (IAC) system, which manages how much air bypasses the throttle plate to keep the engine idling smoothly at the correct RPM. On older systems this is a dedicated IAC valve/motor; the computer uses it to raise idle for cold starts, A/C load, or accessory load. When the system can't maintain the target idle, you may get a high or low idle, surging, rough idle, or stalling — especially at stops or when cold. The cause is usually a dirty or failed IAC valve, but vacuum leaks and electrical faults are common too. Typical repair costs on Nissan range from $150 to $700, depending on the specific model and root cause.
Common Causes of P0505
- •Dirty or carbon-clogged idle air control valve
- •Failed IAC valve motor or stuck pintle
- •Vacuum leak in the intake system
- •Dirty throttle body or sticking throttle plate
- •Wiring or connector fault in the IAC circuit
- •Faulty PCV system causing unmetered air
- •PCM/ECM control fault
P0505 on Nissan by Model
Nissan Cube(1 issue)
- Intermittent Engine Stalling While Driving2009-2014
Multiple owners report the Cube stalling unexpectedly while driving at various speeds, including highway speeds. The engine shuts off without warning, causing loss of power steering and power brakes. In some cases, pumping the accelerator at the moment of stalling can catch the engine before it dies completely. The issue has been linked to faulty crankshaft position sensors, throttle body failures, and ECM software bugs.
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View P0505 across all makes →Frequently Asked Questions
What does P0505 mean on Nissan?▼
P0505 stands for "Idle Air Control System Malfunction." P0505 indicates a malfunction in the idle air control (IAC) system, which manages how much air bypasses the throttle plate to keep the engine idling smoothly at the correct RPM. On older systems this is a dedicated IAC valve/motor; the computer uses it to raise idle for cold starts, A/C load, or accessory load. When the system can't maintain the target idle, you may get a high or low idle, surging, rough idle, or stalling — especially at stops or when cold. The cause is usually a dirty or failed IAC valve, but vacuum leaks and electrical faults are common too. On Nissan specifically, this code is documented across 1 model.
What causes P0505 on Nissan vehicles?▼
Common causes on Nissan: Dirty or carbon-clogged idle air control valve, Failed IAC valve motor or stuck pintle, Vacuum leak in the intake system, Dirty throttle body or sticking throttle plate, Wiring or connector fault in the IAC circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0505 on a Nissan?▼
Repair costs on Nissan range from $150 to $700, depending on the specific model and root cause.
Which Nissan models have P0505 documented?▼
Au7o has documented P0505 on 1 Nissan model: Cube.