Question about GMC Sierra
The check engine light comes on when the truck is in park and idles for about 2 min. stays on for about 2 days then goes off
Have codes read by someone with good scanner that reads trans codes.
Posted on Aug 11, 2015
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Posted on Jan 02, 2017
I have found that when you are going to engauge 4x4 high, it is best to only be going about 3 miles an hour. Not faster, not stopped. It likes some movement to help it mesh. I've had perfect shifts since I started this. Hope it helps. Wade.
Posted on Jan 27, 2009
Make sure you have the proper amount of tranny fluild in it and get that Valvoline fluid out of it. Allison transmissons have there own type of tranny fluid and you want to use it. You can buy the right stuff from a Allison dealer. Most Detroit Diesel dealers are also Allison dealers. Look them up in your phone book and they will tell you the quanity and sell you five gallon pails of the fluid. Just get the serial number off of the side of the transmisson before you call. Change the fliters again too. Believe me, this is important. My company has Yard horses with Allison transmissions and you don't want to screw with the small stuff. Service them right and they work as hard as you want.
Posted on Aug 09, 2009
This model always this problem, usually after about 90,000 miles and the other instruments will eventually follow. There are companies that will repair this for you just use google (instrumentclusters.com) to find them. I was charged 185.00 for the repair... GM wanted over 500.00!
Posted on Feb 02, 2010
ENGINE LACKING POWER CHECK TRANSMISSION FLUID TRANSMISSION COULD BE SLIPPING.YOU COULD HAVE RESTRICED AIR FILTER AND FUEL FILTER.TURBO WASTEGATE PROBLEMS.
Posted on Jul 01, 2010
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