Try this, no guarantees but I once had a Ford that after I disconnected the battery for a minute or so the check engine light would go off. Good luck
You have to disconnect the negative cable. Here are some easy instructions:
In order to reset the "service engine soon" light in the Venture, the negative battery cable must be removed for a couple of minutes. Unfortunately in the Venture, the engine compartment is rather tight, so you must remove a few things just to get to the battery.
Here are the steps you should follow:
Tool set I carry around in the car with me usually
View of the 2003 CHevy Venture with hood opened
Top cover near passenger side window covering battery
Removing of the bar holding the fuse box involves removing 3 bolts
Negative battery terminal of the Venture is in a tight spot
Here is how everything looks disassembled
If the problem that caused the light to come on was not resolved though, the light will probably come back on again. You should go to a local Autozone--they will read the codes from your computer for free to give you a better idea why the light is on in the first place to determine your next step.
disconnect the battery for 30 seconds
unhook the positive on the battery for 5 min. This should reset your check engine light if it doesnt then you still have issues.
reset service engine light
A reset Engine Service Light comes on when an issue comes up with in the engine. This light can be reset by a tech or by fixing the problem.
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There are a couple of ways to reset the Service Engine Soon light on a Suzuki Grand Vitara. The easiest way is to get a scan tool from your local auto parts store. Using the scan tool will reset the service engine light. Disconnecting your vehicle's battery is another way that often works to reset the Service Engine Soon light.
The service engine light has to be reset with a scanner. Disconnecting the battery will not work. The light will come back on unless you make the necessary repairs.