To reset the service engine soon light on a 2004 GMC Envoy you can remove the ECU fuse. ECU stands for electronic control unit.
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.
The service engine or check engine light can be reset with a scan tool or by unhooking the battery. The light will return if the failure that caused the code is not repaired.