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DTC/P0506

P0506: Idle Air Control System RPM Lower Than Expected

Quick Answer
Moderata GravitàSicuro da guidare (a breve termine)Sistema di alimentazione

P0506 means the engine is idling at a lower RPM than the ECU expects, typically 100 RPM or more below target, and the ECU cannot bring it back up. The opposite of P0507, this code is usually caused by carbon buildup on the throttle body restricting airflow, a partially clogged idle air control passage, or a vacuum hose pinched or blocked rather than leaking.

Costo di riparazione stimatoDa €5 a €550+, varia in base al veicolo

Cosa significa P0506?

P0506 means the engine is idling at a lower RPM than the ECU expects, typically 100 RPM or more below target, and the ECU cannot bring it back up. The opposite of P0507, this code is usually caused by carbon buildup on the throttle body restricting airflow, a partially clogged idle air control passage, or a vacuum hose pinched or blocked rather than leaking.

P0506 è un codice diagnostico di guasto relativo a sistema di alimentazione, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0506 e accende la spia motore.

Quali sono i sintomi di P0506?

Se il tuo veicolo ha attivato P0506, potresti notare uno o più di questi sintomi:

  • Idle noticeably lower than normal (500 RPM or less)
  • Engine stalls at idle or when coming to a stop
  • RPM dips and recovers when the AC compressor engages
  • Rough or shaky idle with the engine in gear (automatic)
  • Check engine light on

Cosa causa P0506?

Ecco le cause più comuni di P0506, ordinate in base alla probabilità che siano la causa del problema:

altaCarbon-fouled throttle body restricting airflow at idle
altaClogged or stuck idle air control valve
mediaBlocked PCV passage or restricted idle air bypass
bassaFaulty coolant temperature sensor causing wrong idle target

È sicuro guidare con P0506?

In genere sì, per brevi tragitti. The engine idles lower than the ECU target and may stall at junctions or when the AC compressor engages. Drive cautiously and fix within a couple of weeks to avoid being stranded by an unexpected stall.

Come si diagnostica P0506?

Segui questi passaggi per individuare la causa principale di P0506:

  1. Read freeze-frame data and confirm idle RPM at the time the code set. Compare to the ECU's commanded idle target shown in live data
  2. Remove the intake boot and inspect the throttle plate and bore for carbon buildup. Heavy deposits restrict airflow even with the plate fully closed
  3. Clean the throttle body with throttle body cleaner and a soft cloth. On electronic throttle bodies, do not force the plate open by hand; use the scan tool throttle test instead
  4. If equipped with a separate idle air control valve, remove and clean or test it with the scan tool to verify movement through its full range
  5. After cleaning, perform the manufacturer's idle relearn procedure. Without a relearn, the ECU continues to command the same restrictive throttle position

Quanto costa riparare P0506?

I costi di riparazione di P0506 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean throttle body €5–€15 €0–€60 €5–€75 Facile
Clean or replace idle air control valve €60–€200 €40–€100 €100–€300 Moderata
Replace throttle body assembly €150–€400 €60–€150 €210–€550 Professionale

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

P0506 su veicoli specifici

P0506 si comporta in modo diverso a seconda del tuo veicolo. Seleziona la tua auto qui sotto per cause specifiche del modello, problemi noti e stime dei costi adeguate:

Toyota

P0506 su Toyota Camry

2002-2018

Older Camrys with the 2AZ-FE and 2GR-FE use an electronic throttle body that fouls with carbon over 80,000-120,000 km. Toyota's idle relearn after cleaning requires the engine to idle for five minutes with the AC off, all accessories off, and the throttle untouched.

Cosa causa P0506 su una Toyota Camry?

Toyota CamryThrottle body carbon on 2AZ-FE and 2GR-FE
Toyota CamryPCV valve hose clog restricting idle air supply
Volkswagen

P0506 su Volkswagen Golf

1998-2010

Mk4 Golf with the 1.8T (AGU, AWP) is famous for idle air control valve coking. The valve sits on the side of the throttle body and the bore packs with carbon and oil mist from the PCV system. Cleaning often revives it but a replacement is usually needed before 200,000 km.

Cosa causa P0506 su una Volkswagen Golf?

Volkswagen GolfIAC valve coking on Mk4 1.8T
Volkswagen GolfThrottle body throttle plate carbon on EA113

Costo di riparazione di P0506 per Volkswagen Golf

Costi stimati per i proprietari di Volkswagen Golfadeguato al rialzo rispetto alla media a causa dei prezzi dei ricambi specifici Volkswagen

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean throttle body €6–€17 €0–€69 €6–€86 Facile
Clean or replace idle air control valve €69–€230 €46–€115 €115–€345 Moderata
Replace throttle body assembly €173–€460 €69–€173 €241–€633 Professionale

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

Ford

P0506 su Ford Focus

2005-2014

Mk2 Focus with the 1.6 Duratec is prone to a sticky electronic throttle body causing P0506 along with surging or stalling at idle. Ford has a known throttle body cleaning service procedure with a specific software-driven relearn that resets the adaptive idle values.

Cosa causa P0506 su una Ford Focus?

Ford FocusSticky throttle plate on 1.6 Duratec
Ford FocusPCV breather hose collapse restricting idle air

Costo di riparazione di P0506 per Ford Focus

Costi stimati per i proprietari di Ford Focusadeguato al ribasso rispetto alla media a causa dei prezzi dei ricambi specifici Ford

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean throttle body €5–€14 €0–€54 €5–€68 Facile
Clean or replace idle air control valve €54–€180 €36–€90 €90–€270 Moderata
Replace throttle body assembly €135–€360 €54–€135 €189–€495 Professionale

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

Honda

P0506 su Honda Civic

2006-2015

R18A Civics commonly log P0506 from a clogged IACV. Honda's recommended fix is to remove the valve, clean it with carburettor cleaner, and reset adaptations by disconnecting the battery for ten minutes followed by a ten-minute idle with the AC off.

Cosa causa P0506 su una Honda Civic?

Honda CivicIACV carbon clogging on R18A
Honda CivicThrottle body bore deposits on 1.8 SOHC i-VTEC

Costo di riparazione di P0506 per Honda Civic

Costi stimati per i proprietari di Honda Civicadeguato al ribasso rispetto alla media a causa dei prezzi dei ricambi specifici Honda

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean throttle body €5–€14 €0–€54 €5–€68 Facile
Clean or replace idle air control valve €54–€180 €36–€90 €90–€270 Moderata
Replace throttle body assembly €135–€360 €54–€135 €189–€495 Professionale

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

Questi codici compaiono spesso insieme a P0506 o indicano problemi correlati:

P0505P0507P0508P0509P0171

Domande frequenti su P0506

Why is my car idling so low?

Carbon buildup on the throttle body or a stuck idle air control valve is the most common cause. The engine cannot pull enough air at idle, the ECU cannot bring RPM up to target, and you feel it as a shaky, sometimes stalling idle.

Will cleaning the throttle body fix P0506?

Often yes, but only if you also perform the idle relearn afterwards. Without the relearn, the ECU keeps commanding the throttle to the position it learned when the bore was dirty, and the symptom returns within a day or two.

Why does my engine stall when the AC turns on?

The AC compressor adds load to the engine at idle. A healthy idle control system raises RPM to compensate. When P0506 is set, the system can no longer pull that extra air, so the engine loses RPM and may stall.

Is P0506 the opposite of P0507?

Yes. P0506 means the engine idles too low; P0507 means it idles too high. Both point to a problem with how the ECU controls idle airflow, but the causes are different. P0506 usually points to restriction; P0507 usually points to a leak or stuck-open valve.

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