The light comes on once in a while, then it stayed on, it started just before christmas when I stopped at a stop sign and turnd on my air conditioner, the engine started to shake and the light came on, then it went off after running a few minutes, I had a mechanic run a dial. on it they could not find anything wrong then the light came on and stayed on, but still they can't find anything wrong, my barber told me it might be my gas cap, I thought he might be joking with me.
Could be lots of things. Go to AutoZone or similar and have computer check for codes next time light comes on. My guess it's a sensor not the gas cap.
No , no joke ! a leaking gas cap can cause a code for the evaporative emissions system and turn on the check engine light . This EVAP system stores fuel vapors in a charcoal canister that the PCM - engine computer will purge at certain times . But that doesn't happen that much . Most of the time it is other componets That cause the leak ! Plus there are other thing's that will turn on the serviced engine soon light ! Your vehicle can set hundreds of DTC'S - diagnostic trouble codes . If the light is on there has to be codes stored or a problem with the instrument cluster . Your best bet take it to the dealer !
Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc
SOURCE: Liftgate hydraulics stopped working 2003 GMC Envoy SLT
Yes this is electrical. Start by checking the fuses.
SOURCE: Truck losing power and service engine soon light on
Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.
SOURCE: Service engine light keeps coming on
need to scan for codes and find problem code some part stores do for free
SOURCE: how to reset the service engine soon light
If there is an Auto Zone or any other large auto parts store, have them scan the truck for the DTC codes. The DTC codes will identify the Issues that needs to be addressed in your engine and transmission that has set off the service engine light on. Once the issues has been resolved, the light will reset it self after the third start up and after 40 start up will erase it self from the history as long as there is no additional issues. Good luck and hope this helps, Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.
SOURCE: service engine soon and reduced engine power
disconnect batt. for 30 min. then reconnect,if no problem exist the lights will go away
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