To properly address the SES light, you need to:
1. Diagnose the problem: The light itself doesn't tell you *what* is wrong. You need to use an OBD-II scanner. These are relatively inexpensive and available at most auto parts stores. The scanner will read the diagnostic trouble codes (DTCs) stored by the computer. These codes will pinpoint the issue.
2. Fix the problem: Once you know the code(s), you can research the likely cause and repair it. This might involve replacing a sensor, fixing a leak, or addressing a more serious mechanical issue. Sometimes, a simple repair like tightening a gas cap is all that's needed.
3. Clear the code(s): *After* you've fixed the problem, you can then clear the codes using the OBD-II scanner. Many scanners have a clear codes function. The light will only go off reliably once the underlying problem is fixed.
Important Considerations:
* Don't just clear the code without fixing the problem: The light will likely return, and the underlying issue could worsen, potentially causing more damage or even a breakdown.
* Professional help: If you're not comfortable diagnosing and repairing the problem yourself, take your Trailblazer to a qualified mechanic. They have the tools and expertise to accurately diagnose and fix the issue.
* Gas cap: A loose or faulty gas cap is a common cause of the SES light. Try tightening it first, as this is the simplest and cheapest solution. Drive for a day or two and see if the light goes off. If it doesn't, proceed with the diagnostic steps above.
In short, resetting the light is a consequence of fixing the problem, not a solution in itself. Focus on diagnosing and fixing the underlying issue.
