How do you reset service engine light on a Venture van?

You can't simply "reset" the service engine light (check engine light) on a GMC Venture (or any modern car) without addressing the underlying problem. The light illuminates because the onboard diagnostic system (OBD-II) has detected a fault. Ignoring the light won't fix the issue and could lead to further damage.

Here's the proper procedure:

1. Diagnose the problem: The most crucial step is finding out *why* the light is on. You can do this in a few ways:

* OBD-II Scanner: This is the best approach. Buy a relatively inexpensive OBD-II scanner (available at most auto parts stores) and plug it into the OBD-II port (usually under the dashboard). The scanner will read the diagnostic trouble codes (DTCs), which tell you exactly what the computer has detected. Search online for the DTC code to understand the issue.

* Auto Parts Store Check: Many auto parts stores offer free code reading services. They can tell you the DTCs.

* Mechanic: A mechanic can diagnose the problem accurately and efficiently.

2. Repair the problem: Once you know the cause (from the DTC code or mechanic), fix the underlying issue. This might involve replacing a sensor, fixing a leak, or performing more extensive repairs.

3. Clear the code (after repair): After the repair, *and only after the repair*, you can clear the code. There are a few ways to do this:

* OBD-II Scanner: Most scanners have a "clear codes" or similar function.

* Disconnect the battery: Disconnect the negative (-) battery terminal for about 10-15 minutes. This will often clear the code, but it's not as reliable as using a scanner. Note: This will also reset other computer settings, such as radio presets.

Important Considerations:

* Don't just reset the light: Ignoring the check engine light can lead to more serious damage to your engine, potentially costing you significantly more money in the long run.

* Drive cycle: After clearing the code, you might need to drive the vehicle for a certain period (often referred to as a "drive cycle") for the computer to re-evaluate the system and confirm the problem is solved. The service engine light may temporarily reappear during this drive cycle.

In short, resetting the light is the *last* step, and only after you've identified and fixed the root cause of the problem. Focusing on diagnosing and repairing the underlying issue is the most important action to take.