GMC Computers & Internet - Popular Questions, Answers, Tips & Manuals

Just a suggestion saw where you said video best way so may I suggest you tube videos simple to followif not let us know we can send it word and some drawings to you Thank You

Check that (power) at the connector to the tail gate.

And function work but screen is just blank? If so you must remove the unit from the dash and have it repaired by a GM approved repair center. Google "GM built in GPS repair"

From experience from a 05 Cadillac Deville that my pops had when he couldn't turn the car off for him be able to remove the key from the ignition, we found out that one of the transmission sensor that control the gearbox had went bad causing the transmission to malfunction. That sensor is more likely the answer to your problem. Dealer charge $500 to replace, if not more. Hope this will help you out..

There is no common fuse for each of those. Example: the fuse for the door lock would affect all the locks...same for Windows and mirrors. There is, however a common plug in the wiring of the door. It may be inside the body you will have to trace it back

I suggest you remove the sunroof fuse and check in the manual for the emergency closing procedure. Often cars with a sliding sunroof are supplied with a small handle for the emergency closing if the power fails. Usually only a couple of screws need removing to access the drive socket.

I have an idea, but you might wish to call a GMC dealer and check it out. For many years, the heater & defrosters of GM vehicles have used a vacuum source to operate the systems. If that is your problem, the vehicle needs to build up a vacuum in the lines before the heater or defroster will work. It could be a vacuum leak causing the delay. A leak could cause the system of hoses to lose vacuum after you shut it off, and it is building that vacuum back up when you start the car. Repairing the vacuum leak could be quite expensive, as it could require taking the dashboard apart to fix it. God bless our efforts.

call a dealer

i wouldnt try,have it towed until you figure out why it wont go into park,there are more than 1 thing wrong if it wont go into park and wont start

the fob may need a new battery or need to be replaced. If the fob did not properly deactivate the immobiliser, for whatever reason, then your car would not start. I would have the battery replaced , don't do it yourseld on this occassion, and as a precaution fill the vehicle's battery with electrolute and recaharge it See what happens

In the relay box under the hood

if you take off both battery cables and touch them together for one minute it will reset the lite . but make shure they are disconnected from the battery !!

No DTC'S stored any modules ? Any parasitic drain on the battery ? Does scan tool communicate with the instrument cluster ? Do you know about GM power modes

1. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool.
2. Rotate the ignition switch through all positions while observing the Ignition Switch Power Mode parameter.

Does the Ignition Switch parameter reading match the ignition switch position for all switch positions? What type scan tool are you using ? Can yours communicate with all the modules on the vehicle ? Select the display DTCs function on the scan tool for the following control modules: ?€¢ Transfer Case Electronic Control (TREC)

?€¢ Body Control Module (BCM)

?€¢ Electronic Brake Control Module (EBCM)

?€¢ Instrument Panel Cluster (IPC)

?€¢ Powertrain Control Module (PCM)

?€¢ Sensing and Diagnostic Module (SDM)

Does the scan tool display any DTCs for the control modules listed above? Does the scan tool display any DTCs which begin with a "U"?

three bolts on either side and a bunch of clips,refer to pics

Open drivers door and take off the small cover on the side of the dash. It is ignition fuse 3

go on line to www.youtube.com www.howto.com look on line: you need to look up service manuals for year, make, model, how to removal and installation front bumper. you can check you local auto parts center, go to the counter personnel ask for a copy of removal print out of bumper in the database, even the diagram of the parts description. by seeing the layout of the parts diagram you will see where all the bolts are or a good idea where to look and the will have part size or tools needed so you can do the job. look on line, look up service manual 2012 gmc sierra 1500 work truck. after find site than need to look for installation and removal front bumpers go to local library, automotive shop, friends work on trucks or cars, thank you rod

you have to trace the wiring . may be only a loose wire.

Re-categorize in computer should be in automotive. Terry

there should be a solenoid on a front differential it could be electrical or could be vacuum operated but I would check there. I had an issue with my brother in laws 4x4 and we change the solenoid and everything worked fine