The most common causes are: Vacuum leak — the most common cause by a wide margin; Throttle body needing relearn after cleaning; Stuck or dirty idle air control valve; Failing PCV valve or disconnected PCV hose; Sticking throttle plate or cable.

How much does it cost to fix P0507?

Typical repairs range from $30–$150 for replace cracked vacuum hose up to $300–$800 for replace brake booster. Costs vary by vehicle and region.

P0507powertrain

P0507 – Idle Control System RPM higher Than Expected

What does P0507 mean?

The idle control system is holding engine RPM higher than the computer commanded. The engine idles above target speed and the computer cannot bring it down — usually because unmetered air is entering the engine somewhere.

What causes P0507?

Listed from most to least common:

1Vacuum leak — the most common cause by a wide margin
2Throttle body needing relearn after cleaning
3Stuck or dirty idle air control valve
4Failing PCV valve or disconnected PCV hose
5Sticking throttle plate or cable
6Leaking intake manifold gasket
7Failing brake booster or its vacuum hose

Code breakdown

SystemP — Powertrain

TypeGeneric (standardized SAE / OBD-II code — same meaning across most manufacturers)

SubsystemVehicle speed control, idle control, and auxiliary inputs

Common symptoms

Check engine light on
Idle speed noticeably higher than normal
Vehicle creeps forward strongly at stops
Increased fuel consumption
Possible hissing sound from a vacuum leak

How to diagnose

1Smoke-test the intake system — this finds vacuum leaks faster than any other method.
2Inspect all vacuum hoses, the PCV hose, and the brake booster hose for cracks or disconnection.
3Check the intake manifold gasket for leaks.
4Verify the throttle plate closes fully and is not sticking on carbon.
5Perform an idle relearn if the throttle body was recently cleaned or the battery disconnected.
6Listen for a hissing sound with the engine idling.

High idle wastes fuel, can make the vehicle creep forward more strongly at stops, and puts extra wear on the brakes and transmission.

Common fixes and estimated costs

Repair	Estimated cost
Replace cracked vacuum hose	$30–$150
Clean throttle body and relearn	$80–$250
Replace PCV valve	$40–$150
Replace intake manifold gasket	$200–$600
Replace brake booster	$300–$800

Costs are rough US estimates including parts and labor. Actual pricing varies significantly by vehicle, region, and shop rates.

Good to know

A high idle that appeared right after intake, throttle body, or gasket work almost always points to a hose left disconnected or a gasket not sealing. Retrace the recent repair before diagnosing further.

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This information is provided for general reference only and may vary by manufacturer, model, and year. It is not a substitute for professional diagnosis or repair.