1) Loose or Faulty Gas Cap: A loose or faulty gas cap can cause the check engine light to come on. Make sure the gas cap is properly tightened.
2) Oxygen Sensor: A faulty oxygen sensor can cause the check engine light to illuminate.
3) Catalytic Converter: A failing catalytic converter can trigger the check engine light.
4) Spark Plugs or Ignition Coils: Worn-out spark plugs or faulty ignition coils can cause this issue.
5) Mass Air Flow (MAF) Sensor: A faulty MAF sensor can lead to the check engine light coming on.
6) Evaporative Emission Control System: A problem with the evaporative emission control system can also cause this issue.
7) Faulty Sensors or Wiring: Issues with various sensors or wiring in the vehicle's engine or emission control systems can illuminate the check engine light.
8) Engine Misfire: A misfiring engine can trigger the check engine light.
To accurately determine the cause of the check engine light in your 2006 GMC Savana, it's recommended to have the vehicle diagnosed by a qualified mechanic or a certified automotive repair shop. They can use diagnostic tools to identify the specific issue causing the light to come on.
