Here's what you should do:
1. Get the diagnostic trouble code (DTC): A 1995 GMC Jimmy is likely pre-OBD-II, meaning it doesn't use a standardized OBD-II connector. You'll likely need to visit a mechanic or use a scan tool specific to older GM vehicles to retrieve the trouble code. This code will tell you *why* the light is on.
2. Address the problem: Once you know the DTC, you can begin troubleshooting. This might involve:
* Simple fixes: Sometimes, a loose gas cap, faulty sensor connection, or similar simple issue is the cause. Check these first.
* More complex repairs: Other times, the problem may require replacing a sensor, fixing a leak, or performing more extensive repairs. This is where a mechanic becomes very helpful.
3. Clear the code (after repair): *Only after you have fixed the problem that caused the SES light to illuminate* should you attempt to clear the code. There are a few ways to do this on a pre-OBD-II system:
* Disconnect the battery: Disconnect the negative (-) terminal of your battery for about 15-30 minutes. This often resets the system, but it won't work reliably on all systems. The car's computer memory might still have the error stored.
* Professional scan tool: A mechanic's scan tool will be able to clear the code properly after the repair is made. This is the recommended approach.
Important Considerations:
* Don't just ignore the light: Driving with a malfunctioning system can cause further damage to your engine and lead to costly repairs down the road.
* Pre-OBD-II limitations: Getting the code is crucial, and it can be harder on older vehicles like your 1995 GMC Jimmy. A generic OBD-II scanner probably won't work.
* Mechanic recommendation: Taking your Jimmy to a qualified mechanic is strongly advised. They have the tools and expertise to diagnose the problem accurately and perform the necessary repairs. A simple reset without addressing the underlying issue is a temporary solution at best and risks further damage.
Simply resetting the light without fixing the problem is akin to ignoring a check-engine light on a modern car – it won't solve the underlying issue. Get it checked out!
