Question edited for clarity. Did you know typing in CAPS is considered shouting, plus it is harder to read.
Question moved to model category.
The EGR valve is located in the engine compartment (underneath the hood). Most engines require exhaust gas recirculation to meet emissions standards.
Question edited for clarity.
Question moved to model category.
Did you disconnect the battery when you did the fuel pump?
Did you reset the alarm and engine immobilizer?
Did you check for Diagnostic Trouble Codes?
Something has likely fallen between the top of the liftgate and the cab. It will be the space above the seal. Use a clothes hanger or something similar to remove the obstruction.
For strangeness like that, you need a good local auto electrician with a pro grade scan tool computer. Sounds like a communication issue with sensors and the BCM.
The Denali is seen often on this site with electrical problems. It is terribly over-engineered and reliant on modules and sensors. The issues you are seeing are all issues with the BCM (Body Control Module). Before you rush out and buy one, take the vehicle to a good auto-electrician. With a high level scan tool computer, they can run live data and diagnose issues historically and as they happen.
Every time you disconnect the battery, you would have to do a Security Re-Learn and also, various engine parts have to relearn themselves as they run. The Throttle Body is one, and that is the part that monitors your idle along with the sensors attached to it.
Some radios have to have the vehicle VIN Number programmed into them. This was done as a way to stop 'theft to order'. Perhaps yours wasn't original to the vehicle, and the alarm system (BCM controlled) sees that?
We have a GM electronics Expert here, so hopefully Jeff will also chime in..
If there is no other adjustment available for the cable, It sounds like your cable is stretched. It happens after years on older vehicles. While you can do things to make it tight, it probably would be better to replace it with a new cable. I found some on eBay for just over 20.00 up to around 50.00 each that are supposed to fit the Yukon. Old stretched cables can snap/break allowing the vehicle to roll.Parking Brake Cable For Select 00-06 Cadillac Chevrolet GMC Models 1479-02742 (Fits: 2004 GMC Yukon)Autopart International 1479-02742 Multiple US LocationsBrand New$21.99Save up to 25% when you buy moreList price: Previous Price$27.99??21% offBuy It NowFree shipping
changing your denali awd to reg is more about the electronics than the trans swap out --you ll need the harness --switches and reprogram/flash the computers --mounts--cross members and other brackets and such ----oin one of the many forums like tahoe--yukon etc this is one of a few on the subject --------https://www.performancetrucks.net/forums/gm-drivetrain-suspension-22/denali-awd-conversion-4wd-482852/--
Remove the speed sensor and look in the hole, are there teeth in there and do they move with the vehicle, this really sounds like a speed sensor problem so if all appears good including checking the wires with a continuity tester get a new sensor.
It is the control module on top of the windshield wiper motor. The multifunction switch provides a specific DC voltage to the control module for each delay and speed.
Further testing would be necessary to determine the cause.
See first half of following video for access to the motor.
You will need to take it to a parts store like NAPA and see if they will read the tcm (transmission control module) for codes, if all else fails then take it to a transmission shop and ask if they can scan it for codes and check the functionality of the tow haul button if it is not functioning, it could be just a broken wire from flexing at the base of the shifter.
