P0507

Idle Air Control System RPM Higher Than Expected

OBD-II diagnostic trouble code P0507indicates a fault detected by the vehicle's onboard computer. This code applies to all OBD-II compliant vehicles and should be addressed promptly to avoid potential engine or emissions system damage.

Severity Level 3 — Moderate

This code indicates a moderate issue that may affect vehicle performance and fuel economy. Continued driving is possible in most cases, but prompt diagnosis and repair are recommended to prevent further damage.

Common Symptoms

• Check Engine Light on
• Engine idle speed too high (typically 1000-1500 RPM in park/neutral)
• Vehicle creeps forward faster than normal when in drive with brake applied
• Engine RPM hanging between shifts (manual transmission)
• High fuel consumption at idle

Possible Causes

• Vacuum leak — unmetered air entering intake manifold, most common cause by far
• Stuck-open IAC valve — carbon deposits prevent pintle from closing
• Binding or sticky throttle cable/linkage preventing throttle plate from fully closing
• Faulty throttle position sensor — reporting throttle is partially open when it's not
• Intake manifold gasket leak (common on older vehicles with plastic intake manifolds)
• Faulty PCV valve stuck open creating internal vacuum leak

Common Fixes

• Diagnose and repair vacuum leak — smoke test ($100-150) + repair ($20-400)
• Clean or replace IAC valve ($10-250)
• Lubricate or replace sticky throttle cable ($30-150)
• Replace faulty throttle position sensor ($40-200)
• Replace intake manifold gaskets ($200-600)
• Replace PCV valve ($10-40)

Estimated Repair Cost

These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.

Explore Repair Costs

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