Here's what it means:
* It's a warning, not a specific problem: The SES light doesn't tell you exactly what's wrong. It simply indicates that the vehicle's onboard computer (the engine control unit or ECU) has detected a fault or potential fault within the emissions or engine systems.
* It can be triggered by various issues: These can range from a simple loose gas cap to more serious problems like a faulty oxygen sensor, a misfire, or a catalytic converter issue.
* You should address it promptly: Ignoring the SES light could lead to:
* Reduced fuel economy: A malfunctioning engine system can consume more fuel.
* Increased emissions: This could lead to environmental damage and potentially, fines in some areas.
* Engine damage: If the issue is left unaddressed, it can lead to further damage to the engine.
Here's what you should do when the SES light comes on:
1. Don't panic: The light might be due to a minor issue.
2. Check the owner's manual: The manual will provide information on potential causes and troubleshooting steps.
3. Have the code read: Take your Envoy to a mechanic or use an OBD-II code reader to determine the specific fault code. This will help identify the problem.
4. Get it fixed: Once you know the cause, address the issue promptly. Don't try to reset the light without fixing the underlying problem.
Remember:
* The SES light can sometimes be triggered by something simple like a loose gas cap. Tighten it and see if the light goes off. If not, consult a mechanic.
* The light may not always come on immediately after a problem arises. It may take some time for the ECU to detect a fault.
By addressing the issue promptly, you can maintain your Envoy's performance, efficiency, and longevity.
