* Get the diagnostic trouble codes (DTCs) read: This can be done at an auto parts store (like AutoZone, Advance Auto Parts, etc.) for free. They'll plug a code reader into your vehicle's OBD-II port (usually under the dashboard) and retrieve the codes. These codes give clues about the problem.
* Research the DTCs: Once you have the codes, you can search online (e.g., Google the code numbers) to understand what they mean. Many websites and forums offer explanations.
* Inspect obvious things: Before going to a mechanic, check simple things like your gas cap (a loose or faulty gas cap can trigger the light), and ensure all fluid levels (oil, coolant, transmission fluid, brake fluid) are correct.
* Consult a mechanic: If the problem isn't obvious or you're uncomfortable diagnosing it yourself, take your Suburban to a qualified mechanic for diagnosis and repair. They have the tools and expertise to accurately determine the cause and fix it.
Without knowing the DTCs, it's impossible to say why the light is on. It could be anything from a simple sensor issue to a more serious problem requiring significant repairs.
