Air intakeSeverity Medium: diagnose soon

P0506Idle Air Control System RPM Lower Than Expected

What it means

The idle speed stays below the target even though the ECU opened the idle control as far as it can.

Symptoms

Low or rough idle
Stalling, especially with the air conditioning on

Common causes

Dirty or carboned throttle body
Restricted air filter or intake
Engine mechanical issue (compression, timing)
Extra load (alternator, AC compressor)

What to check first

Clean the throttle body and relearn
Check intake restriction
Check engine load sources

Can I drive with P0506? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0506: questions and answers

What does P0506 mean?

P0506: Idle Air Control System RPM Lower Than Expected. The idle speed stays below the target even though the ECU opened the idle control as far as it can.

What are the symptoms of P0506?

Low or rough idle. Stalling, especially with the air conditioning on.

What causes P0506?

Dirty or carboned throttle body. Restricted air filter or intake. Engine mechanical issue (compression, timing). Extra load (alternator, AC compressor).

How do you diagnose P0506?

1. Clean the throttle body and relearn 2. Check intake restriction 3. Check engine load sources

Can I drive with P0506?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.