You have a problem with an emissions related component. Have the ECU scanned with an OBD2 scan tool to retrieve the code that has been set. A professional can use this code to diagnose the problem.
Indicative of problem with engine emission system
To reset the service engine soon light on a 2004 GMC Envoy you can remove the ECU fuse. ECU stands for electronic control unit.
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.
Disconnect battery and wait about 1 minute
There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool. After repair light can be shut off with scan tool.
re: 04 Envoy - my service 4wd light came on in the middle of a 10" blizzard. I researched it and took it to Jiffy Lube and had the front & read differential fluids changed. Light went off and has stayed off. Now my "service engine" light keeps coming on - I'm concerned that I may have a crack in the gas tank as I have read many many other Envoy owners have experienced.
i have replaced the plugs and wires and my service engine light comes again in 2004 land rover discovery
on some cars, the service engine light comes and no code is present when a headlight is out
Service required is the oil change reminder. Service engine soon would be the check engine light.
Get a code reader from Autozone or a friend and plug it into the OBDII connection to read what code caused the check engine light to illuminate. A flashing check engine light indicates to NOT drive any further.
The service engien light (check engine) comes on when the engine computer detects a malfunction and sets a code. You need to have the codes read, diagnosed and repaired to keep the light off.The service engien light (check engine) comes on when the engine computer detects a malfunction and sets a code. You need to have the codes read, diagnosed and repaired to keep the light off.
service engine soon light comes on