This can be any number of things from bad spark plugs to catalytic converter, crank or cam sensors to map sensor. Have it scanned, find out what code is stored and that will tell you the problem.
To reset the service engine soon light on a 2004 GMC Envoy you can remove the ECU fuse. ECU stands for electronic control unit.
Indicative of problem with engine emission system
Disconnect battery and wait about 1 minute
In a 2006 GMC Envoy, the starter is located on the driver's side of the engine, near the bottom of the engine block. It is positioned between the engine and the transmission, making it somewhat accessible from underneath the vehicle. To replace or service the starter, it may be necessary to remove some components for better access.
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.
On a 2005 GMC Envoy, the fan is typically located in front of the engine, mounted to the radiator or as part of the engine's cooling system. It may be driven by a belt connected to the engine or may be an electric fan. If it's an electric fan, it will be positioned behind the radiator. For specific access, refer to the vehicle's service manual.
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.
On a 2006 GMC Envoy, the spark plugs are located on the engine's cylinder heads. For the inline-six engine, they can be found on the top of the engine, accessible by removing the engine cover if present. If your Envoy has a V8 engine, the spark plugs are located on either side of the engine block. Always ensure the engine is cool before attempting to access or replace the spark plugs.
Have the codes checked to know possible causes.Have the codes checked to know possible causes.
On a 2002 GMC Envoy, the oil pressure sending switch is typically located near the oil filter on the engine block. It is usually found on the driver's side, towards the rear of the engine. You may need to remove some components for better access, depending on the engine configuration. Always consult the vehicle's service manual for specific details and diagrams.
The recommended spark plug gap for a 2003 GMC Envoy is typically between 0.040 to 0.060 inches, depending on the engine configuration. It's always best to consult the owner's manual or a service manual for the specific engine type to ensure the correct gap. Proper gap settings help optimize engine performance and fuel efficiency.
The crankshaft position sensor on a 2002 GMC Envoy is typically located near the bottom of the engine, often on the engine block or near the crankshaft pulley. To access it, you may need to remove the engine cover and, in some cases, other components that obstruct your view. It's advisable to consult the vehicle's service manual for specific details and diagrams for your model.