Top 20 2007 GMC Yukon XL Denali Questions & Answers

Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this . The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system: • Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing. • Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks. • Compressor--Supplies pressurized air to the rear shocks • Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor. • Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks. • ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage. • Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks. • Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height • Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.

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Who put the front brakes an wheel hub bearing on the vehicle ? A qualified repair shop ? A friend ? The front brakes an wheel hub would have nothing to do with the brake lights . An the brake light switch is an input to the BCM - body control module . Stop Lamps When the driver presses the brake pedal, the switch contacts open and battery positive voltage is interrupted to the BCM. The BCM then supplies voltage to both the turn/stop lamp supply voltage circuit and trailer rear turn/stop lamp supply voltage circuits. The BCM also supplies voltage to the CHMSL though a dedicated circuit. I suggest you take it back to who did the front brakes , or a quailfied repair shop . DTC B3445 00: Stop Lamp Circuit - DO you know what a DTC is ? diagnostic trouble code ! Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Stop Lamp Supply Voltage B3445 00 -- Stop Lamps Inoperative Stop Lamps Always On Circuit/System Testing Disconnect the stop lamps and test the individual stop lamp assemblies for internal shorts between all terminals. ? If a short between terminals is found, replace the stop lamp socket or circuit board as applicable. Test the stop lamp supply voltage circuit for a short to ground. ? If all circuits/connections test normal, replace the BCM.

have the trouble codes scanned most auto stores offer this service for free the code[s] will be a start point toward repairing your problem

Hi Bryce, For the miles and engine in your vehicle, a bit of visible smoke from the tailpipe on cold start is normal. It indicates a small amount of engine oil is leaking past the "valve-guide seals" in the cylinder head. For now, I wouldn't let it concern you too much because it's actually a VERY small amount of oil making its way into the combustion chamber while you're snoozing. It only takes a drop or three to produce a huge amount of visible smoke when it burns, and it probably won't even leave deposits on your spark plugs at this point. This condition isn't harming anything except your nerves, and it won't cause a breakdown or leave you stranded. The oil lost (per mile) is too small to result in the need to check the dipstick more often, but you should get a sense of the loss-rate by periodic checks over a given number of miles. Top off your oil, and check it every two or three fill-ups, and, my guess is, you won't have to add a quart before driving 1000-1500 miles, which is nothing to worry over, but determine how many miles it takes to use a quart, so you know when to add. If you want to narrow it down, pop the plugs out and check for any light colored deposits, and note the particular cylinder from which a contaminated plug was removed. You'll probably see little, if any, deposits for now. Oh, and there are NO magic snake-oil remedies, despite fancy promises on the labels of opportunistic, quick-fix makers. Don't fall for their distractions. The best you can do is to keep up on your oil maintenance. Running dirty oil causes accelerated seal wear. Happy Motoring!!!

I'm just curious if your aware of the BCM function's on your vehicle an if you know what the gate way module is ? An do you know about serial data communication between modules ? An do you know what the power mode master is ? And do you know the BCM needs programming ? The body control module (BCM) in this vehicle functions as a gateway or translator. The purpose of the gateway is to translate serial data messages between the GMLAN high speed buss and the GMLAN low speed buss for communication between the various modules. The gateway will interact with each network according to that network's transmission protocol. One example of this necessary communication is the communication between the engine control module (ECM)/powertrain control module (PCM) which is high speed serial data and Theft Deterrent Module which is low speed serial data. If these modules can not exchange information, the vehicle will not start. Communication between the BCM and a scan tool can be on the high speed GMLAN network or low speed GMLAN network. If one network is lost, the BCM can still communicate with the scan tool. A lost communication DTC typically is set in modules other than the module with a communication failure.

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? 2:12 www.youtube.com/watch?v=xU6ybiY3F4I Sep 1, 2010 - Uploaded by 76bluemoon Back lift gate/glass would not open or release. ... Wow, are you sure? .... known issue with tahoe, suburbans, hummers and othergmc vehicles. ... 2007-2012 Yukon Denali Rear Door Lock Actuator Replacement ... 2004 GMC Yukon XL rear liftgateremoval - Duration: 50:17. by Velvethamma 5,814 views.

If front park lights are working highly unlikely headlight switch is the issue. Is the vehicle equipped with a trailer towing package and wiring to the rear? I would start there. This vehicle may also have a taillight module located under the vehicle on the passenger rear attached in the wheel well area that goes bad

get stuffed

You need to be pretty car savvy!.. Copy and past the link below, watch video:http://youtu.be/hxw3LSwZpRc

Hi you might want to check if your back up lights and your back up sensors are working, this can be a sign of the transmission control module not working properly. There is a controller that tells the radio to switch to camera view. Let me know what you find out.

My son is a master technician. He said it sounds more like the heater core to him. Does it have any smell to it, like antifreeze. I would definitely get a second opinion.

is on the evap system need to ck the evap valve

Code not revel ant to this vehicle!

Sounds like a sensor is not working properly. Check to see if there are any obstructions in the way or excessive dirt around the latch or contacts

You have to remove the dash board and the heater box to get to it. On a scale of 1-10 I would give it an 8.5

I get this same symptom when my phone is connected via Bluetooth and I receive a text message. Do you happen to have your phone connected via Bluetooth?

Might need to adjust rear door latch, or could be bad relay or switch. Try pulling/pushing on rear door while closed to see if you can set this off while sitting still.

Sender can most easily be changed by using special socket made for this purpose.

check your fuel pump for proper pressure and even though your warranty is out they are still responsible to fis it because it happepned while under warranty