I have a GMC 2005 3500 diesal allison trans truck. 1. The speedometer is only working part time. 2. The door panel control for the driver side heated seat won't stay on. What part do I need to fix the speedometer, and how can I find out if my door switch is broke and that it is my problem?

SOURCE: 02 gmc allison tran. wont go into tow-haul mode

THERE HAVE BEEN ALOT OF PLOBLEMS WITH THE SHIFTER HANDLE/SWITCH. THE BEST WAY TO VERIFY CONCERN IS USE A DIAG. SCANNER & VIEW TRANSMISSION DATA DISPLAY WHILE ENGINE RUNNING. THE SWITCH IN THE SHIFTER IS FAULTY. IF YOU SEE NO INPUT CHANGE WHILE DEPRESSING SWITCH THIS IS YOUR CONCERN.

SOURCE: HAVE A 03 GMC SIERRA

I had the same problem in my wife's 2003 Yukon Denali. The power seats and passengers side window wouldn't work. Turned out to be a blown Buss Type fuse in the Underhood Fuse Block. It is the one marked MBEC 1 50amp. Hard to tell if the are blown so look very carefully. Should look like a hoop with two shiny solderlooking bubbles on either side. On my blown fuse, it caught my attention because it looked like the solder was missing and I had to look very closely to see the bottom of the "hoop" was open. They are very hard to remove and must be pulled straight up.
This type of fuse looks like a red square with a clear plastic top showing the fuse link under the plastic. On my vehicle it is on the top row second one from the left.

Wade Cook

• 6 Answers
• Posted on Jan 27, 2009

SOURCE: 4X4 inop on 2003 GMC Sierra 2500HD

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.

SOURCE: How do you remove the door panel on a 1997 GMC 1/2 ton trucks?

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008f768
Hope this helps!

SOURCE: Replace glass, drivers door on 1997 GMC 1/2 ton Truck ,2wd, Power windows

you might also have to drill out the rivets that hold the lock actuator on to be able to manage the last roller into the scissor assembly. Use larg 1/2 in sheet metal screws to reattach.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/cody_17f08cf8e340c06c

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