I'm not getting any check engine lights or codes, my Yukon isnt making a connection when hooked up to DMV for emissions test, I want to try resetting computer first before taking it in to GMC
May need a new alternator
SOURCE: Check Engine light-2003 Yukon XL
you have to take it to a auto part store and they can tell you if there are any problems using a key code and then reset it
Probably carbon build up on a sensor. Had this happen on a Ford Expedition. I put it on the highway and hammered it several times. It blew the carbon off the sensor. Light went away.
SOURCE: 2003 GMC Yukon - fuel pump
Check your ECM fuse. There should be 2 fuses for your ECM. It's the ECM that controls the function of the fuel pump. Good luck friend and it's also common for the wire harness from the frame to the fuel pump to go bad due to corrosion from the bad weather we get in the winter and rainy spring and fall.
SOURCE: how do you reset the check engine light on a 2003
the check engine light means you have a trouble code in your vehicles computer. After fixing the problem with the yukon the check engine light can be reset sometimes by disconnecting the battery and disconnecting the ECM fuse. Although some parts stores are known to check your codes for free they might also clear them with a scan tool.
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