P0506 on Honda
Idle Air Control System RPM Lower Than Expected
P0506 on Honda vehicles indicates idle air control system rpm lower than expected. Au7o has documented this code across 1 Honda model — most commonly on Civic. This code means the engine computer detected that the engine's idle speed is lower than the target idle RPM it commanded. The PCM controls idle speed through the idle air control valve or electronic throttle and sets this code when the actual idle drops below expected. A low or rough idle can cause stalling, hesitation, and reduced drivability. Typical repair costs on Honda range from $50 to $300, depending on the specific model and root cause.
Common Causes of P0506
- •Vacuum leak in intake or hoses
- •Dirty or carbon-clogged throttle body
- •Faulty idle air control (IAC) valve
- •Dirty or failing mass airflow sensor
- •Clogged PCV system or EGR sticking open
- •Worn or dirty fuel injectors
- •Excessive engine load from accessories
P0506 on Honda by Model
Honda Civic(1 issue)
- Idle Air Control Valve Carbon Fouling — Hunting/High Idle and Stalling1996-2005
The idle air control valve (IACV) on the throttle body meters the air that bypasses the closed throttle at idle. On D-series Civics it fouls with carbon and the pintle sticks, so the ECU can no longer stabilize idle. Symptoms are a hunting/surging idle, abnormally high idle, or the engine dying when coming to a stop or cold. It is a common, inexpensive fix that owners search because the car stalls at intersections and feels erratic.
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View P0506 across all makes →Frequently Asked Questions
What does P0506 mean on Honda?▼
P0506 stands for "Idle Air Control System RPM Lower Than Expected." This code means the engine computer detected that the engine's idle speed is lower than the target idle RPM it commanded. The PCM controls idle speed through the idle air control valve or electronic throttle and sets this code when the actual idle drops below expected. A low or rough idle can cause stalling, hesitation, and reduced drivability. On Honda specifically, this code is documented across 1 model.
What causes P0506 on Honda vehicles?▼
Common causes on Honda: Vacuum leak in intake or hoses, Dirty or carbon-clogged throttle body, Faulty idle air control (IAC) valve, Dirty or failing mass airflow sensor, Clogged PCV system or EGR sticking open. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0506 on a Honda?▼
Repair costs on Honda range from $50 to $300, depending on the specific model and root cause.
Which Honda models have P0506 documented?▼
Au7o has documented P0506 on 1 Honda model: Civic.