You need to hook the computer up to a scan tool to read the codes. That will tell you why the light is on.
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.
I've got a better question, why is this question in the Chevy venture forum ?
How do I reset the service engine light on a 2003 Chevy Trailblazer?
If the check engine light is blinking that means an engine cylinder misfire has been detected
I have a 2000 venture and the traction control light came on. Where do I look first, hubs. Wiring.
Disconnect the battery for approximately two minutes.
Maybe you should service the engine soon. :P
can you tell me why my 1999-2000 Chevy trailblazer light is on
Check
When service engine light is on on a 2003 Chevy Trailblazer, the problem could be a faulty thermostat, a circuit range performance problem, or any other problem.
I have Chevy Venture too. Engine service soon sign will definitely bring some troubles later related to Engine heatup specially in summser season. Right away go for the engine tune up which is not cheaper than later you are gonna pay after your engine will heatup and cease. Change all the filters with oil channge and specially throw out the plugs it already had and change it with new Bostch plugs to have better performance. Overall Chevey Venture is a fabulous van I have ever driven or seen before.