Question about 2007 GMC Sierra 2500HD
I am supossed to hook into pin 71 on the ecm how do I find this on the ecm what color is it? 2007 6.0 2500 hd Two wheel drive Gas On a four wheel drive it hooks into the purple/white trace wire on the transfer case..??
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Posted on Jan 02, 2017
SOURCE: 2000 gmc 4 wheel drive
Look in your fuse box for the bcm fuse (body control module) and remove the fuse atleast for a mint and then start the vehicle, put it in neutral and disengage the 4L and you are done once it is disengaged turn the vehicle off and re-insta the fuse yo pulled out and you should have no problem.
Posted on Dec 01, 2008
SOURCE: four wheel won't engage
Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)
Posted on Dec 29, 2008
SOURCE: Service four wheel drive
Without further diagnostics, it could be any # of causes, but these are notorious for bad conections at the transfer case encoder motor and /or the encoder motor itself.The motor,when replaced may need to be reprogramed.Be sure the switch and wiring are functioning properly as the encoder and/or related control module are pricy$$
Posted on Jan 10, 2009
Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel
Posted on Feb 16, 2009
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