P0505
Idle Control System Malfunction
Description
Idle Control System Malfunction. This powertrain diagnostic trouble code covers the engine, the fuel and ignition systems, emission control and the transmission.
OBD Codes Details
Possible Causes
Faulty speed sensor, dirty throttle body or idle air valve, vacuum leak, damaged wiring
Solution
Inspect the speed sensor and its wiring, clean the throttle body, look for vacuum leaks, relearn the idle position
Symptoms
- Idle speed too high, too low, or fluctuating
- Engine stalls at idle or when coming to a stop
- Check engine light illuminated
- Rough or hunting idle
- Poor throttle response at low speed
Diagnostic Recommendations
- Clean the throttle body and idle air control passages
- Test idle air control valve/motor operation
- Check for vacuum leaks affecting idle air
- Inspect throttle body wiring and connector
- Reset and relearn idle position after cleaning or repairs
Repair Cost Estimate
- Throttle body cleaning: $80-150
- Idle air control valve replacement: $80-250
- Vacuum leak repair: $100-300
- Diagnostic scan: $80-150
- Total diagnostic and repair: $150-700
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Fact-checking completed
Verified by:
Pavel Volkov
Created:
Information verified against official sources
Official Sources
Society of Automotive Engineers
Official OBD-II diagnostic trouble codes standard (SAE J2012)
Automotive engineering standards organization
International Organization for Standardization
International standard for vehicle diagnostic systems
International standards for automotive diagnostics
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