Question about 2005 GMC Sierra
4wd service light on automatic transfer case, lights on dash switches not on and switches will not shift vehicle into and out of 4wd
Been here /transfer case control module/ electric -shift /actually easy fix /under left sideof instrument panel.behind headlight switch.if thats not it/electric shift motor and encoder assembly /sounds confusing but its easy fix to .get u a repair manual youll see.good luck.
Posted on Jan 25, 2013
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Posted on Jan 02, 2017
BY YOU HAVING AUTOMATIC 4 WHEEL DRIVE.YOU HAVE A SHIFT CONTROL MODULE IN TRANSFER CASE.IT CONTROLS YOUR 4 WHEEL DRIVE SYSTEM BY RECEIVING INFORMATION FROM SPEED SENSOR ON TRANSFER CASE OUT PUT SHAFT.TAKE IT TO DEALERSHIP.THEY WILL HAVE TO FIX IT.
Posted on Jul 20, 2009
Have you reset the computer?
If not,you need to diconnect the battery for a few minutes.
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Posted on Jan 17, 2009
I have the same problem. It is intermittent and sometimes shows up with service transmission message. To get rid of it just put the truck in park, press the 2 high button and shift into drive while it is still flashing. I will worry about it more when it blows up. You can drive with the vehicle showing the solid neutral and it seems to make no difference. It has to be a wake up problem between the control modules. It only happens on start up.
Posted on Sep 06, 2009
About 45% of all transmission problems are due to a defective battery, its components and the charging system. Make sure you have the correct battery in the vehicle and inspect all items relating to the charging system and the battery. The vehicle should charge between 13,5 to 14.5 volts. The condition of the belts is part of this inspection. If all of this is A-ok then get a scanner and pull the codes in the PCM.
Remember once light is illuminated for a item that item no longer works. Once you've gotton to this point let me know and I'll walk you threw it. Hopefully its just a weak or incorrect battery or something along those lines. Good luck and keep me posted
Posted on Mar 09, 2010
Transfer case engages/disengages via a vacuum line. If the vacuum line is cracked, often by age and cold weather, it has to be replaced to allow a good vacuum pressure.
Posted on Mar 15, 2010
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