P0505
Idle Control System Malfunction
Description
Idle Control System Malfunction This body system diagnostic trouble code indicates an issue with the vehicle's comfort, safety, or convenience systems.
OBD Codes Details
Possible Causes
Blown fuse, faulty switch, damaged wiring harness, poor electrical connection
Solution
Check fuses and relays, inspect wiring harness, test switches and sensors, repair damaged circuits
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:
Last updated:
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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