Question about 2002 GMC Sierra 2500HD

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I have a 2002 2500HD with ZF-6 tranny and Duramax engine. Truck has 48000 miles. When I depress clutch to shift the engine makes a weird noise and the pitch of the engine changes. It is not hard to shift, just started problem about 1000 miles ago????

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Papa Chan
  • 56 Answers

SOURCE: 2003 GMC Duramax Diesel won't start

I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.

Posted on Jan 05, 2009

Monster80
  • 460 Answers

SOURCE: where are the computer's on a 2004 2500hd duramax

it should be some where in the front of the truck on drivers side..down next to the frame..they move them so much but it will be in that area..hope this helps you and repost if no luck..have a great night

Posted on Apr 02, 2009

  • 1 Answer

SOURCE: Duramax Shuts off at 1000 rpms

I had the same problem and it ended up being the EGR Valve that was sticking.

Posted on Apr 28, 2009

  • 1 Answer

SOURCE: 97 yukon 4wd. Jerks and makes noise like its

Hi amberdawn_84

My 97 yukon did the same thing (I believe). The valve body in the transmisson wears out (design problem) and causes the transmission to shift really hard. My repair was about $500 (nondealer).
LOVE MY YUKON!

Posted on Jun 02, 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

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