20 Most Recent 2007 GMC Envoy Denali - Page 5 Questions & Answers

it should be located on the bottom half of the engine on the passenger side, next to the oil pan.Godiag T300+

check switches and connections

if you know what you're doing, you can do it fairly quickly. take it to a shop if you don't. they'll do it in about an hour.

pop off the positive battery cable for about 3-5 mins should induce hard reset

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.When the Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

Assuming you have the 6 cylinder 4.2L engine, the plugs are under the large black air box that has VORTEC on it. Each plug has a coil pack mounted above it, these coil packs need to be removed to get access to the plugs.

You have three possible things left, check fuse #35 in the underhood fuse panel, wiring harness going to resistor pack (look for burnt wires or melted connector), or a bad blower motor.

Enovy fuel level sensor is integrate into the in-tank fuel pump.
It's the connector with 4 pins (square).
You can inspect the cable loom for damage.

Here's the LINK to view the fuel assembly unut. The square is on the top right.