Question about GMC Sierra

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2008 2500hd Duramax/Allison trans. Why is check engine light on?

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

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  • GMC Master
  • 5,309 Answers

Have codes read by someone with good scanner that reads trans codes.

Posted on Aug 11, 2015

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  • 2 Answers

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Posted on Jan 02, 2017

justuscc
  • 360 Answers

SOURCE: duramax in a 1993 2500

sure if you have all the computers and wire harnes.

Posted on Oct 13, 2008

TheValley
  • 6 Answers

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.

Posted on Jan 27, 2009

  • 52 Answers

SOURCE: 01 duramax allison changed fluid and filters now in limp mode

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

  • 14 Answers

SOURCE: rpm gauge, speedometer, & other gauges

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

  • 14036 Answers

SOURCE: Hey i have a 2006 gmc sierra 2500hd duramax 6.6

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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2002 duramax 1 ton 4x4 Has first and second, no higher shift. Any ideas on problem?


it's allison 1000 on that truck have code retrieve. The pcm take action like no 3rd and fourth it want to protect the trans.Find out code

Aug 07, 2013 | 2002 Chevrolet Tracker

1 Answer

Will a transmission from 2003 duramax fit in a 2004 duramax?


They will deefinitely providing the 2 are the same model. In 2004 the Allison tranny was available in a 5 or a 6 speed. Before 2004 only the 5 speed was used. If one is changed for the other there will be shifting issues and codes set in both the ECM (engine control computer) and TCM (transmission control computer). Make sure you are putting in a 5 speed Allison tranny.

Jan 29, 2011 | GMC Sierra Cars & Trucks

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03 Duramax Allison Transmission. Sometimes when


Sounds like an igition switch to me, with the discription you are giving.

Dec 12, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

02 duramax w/allison trans threw a P0776 code truck would not pull forward unless in 4 wheel drive. Made clunking noise when put in drive from park. This is apparently a b solenoid but where is it located...


nsbu switch located driverside on the tranny where the gear selector is 2 wire plugs and 2 bolts holding it on, part is about $46 at napa, very common problem with allison

Sep 10, 2009 | 2002 Chevrolet Silverado 2500HD

1 Answer

01 duramax allison changed fluid and filters now in limp mode


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.

Aug 01, 2009 | 2002 Chevrolet Silverado

1 Answer

2005 Duramax with Allison. Torque Converter stays locked up. What can cause this and how can I get it unlocked? Thanks for your help.


there is a solenoid that turns it on and off, it (the lock up part) works by pressure. There is not a magic switch or valve that will turn it off. Most of the time a new torque converter is the only fix, but not always. Allison is a different bird than the GM trans. GM let us fix that at the dealer Allison would have us pull it and replace it.

Jul 31, 2009 | 2005 Chevrolet Silverado 3500

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