P0508
Idle Air Control System Circuit Low
Moderateengine
Overview
The P0508 code indicates the engine control module has detected a idle air control system circuit low condition. This is an engine-related diagnostic trouble code that may indicate a mechanical or control issue affecting the engine's operation. Depending on the severity, this code may require immediate attention to prevent engine damage.
Symptoms
- Unusual engine noises (knocking, ticking)
- Reduced engine power
- Erratic or fluctuating idle RPM
- Vehicle goes into reduced power mode
Common Causes
- Low or dirty engine oil
- Blown head gasket
- Carbon buildup in engine
- Failed engine control module
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
- 2Check engine oil level and condition; change if overdue
- 3Perform a compression and leak-down test
- 4Inspect related sensors and their wiring connections
- 5Listen for unusual engine noises indicating mechanical issues
Estimated Repair Cost
$200 — $3,000
Cost varies by vehicle, location, and repair shop. Includes parts and labor.
Commonly Affected Vehicles
BMW 3 SeriesChevrolet CamaroFord MustangKia Sorento
Related Codes
More Engine Codes
Frequently Asked Questions
Engine codes can range from minor sensor issues to critical mechanical failures. If you notice overheating, knocking, or significant power loss, stop driving and have the vehicle towed to a mechanic.