Question about 2001 Chevrolet Silverado 2500HD

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Allison 1000 wont shift out of first gear - 2001 Chevrolet Silverado 2500HD

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Posted on Jan 02, 2017

  • 14585 Answers

SOURCE: Truck will not shift. Service

First you need to have the codes read. When the light comes on it stores a code, even if the light goes back out. Transmissions run off various sensors, MAF, TPS, Transmission range sensor. One of these start messing up and so does the transmission, plus other engine related problems. Get the codes and let me know.Randy

Posted on Feb 27, 2011

  • 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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1 Answer

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

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I have a 01 Chevy 2500. With the 1000 series Allison. I just had the fort main sealed replaced. But now I think my truck went into limp mode. It won't shift outta 3rd gear but if there is any solution...


Have the fault codes read. Replace faulty items. Use only
genuine items as replacement as non-genuine are not always compatible with the OEM fitted CPU units. This results in the fault codes not cancelling out. possible a failed shift solenoid that is causing the problem

Jun 01, 2013 | Cars & Trucks

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Truck will not shift. Service engine soon light is on when this happens. Truck has the allison I believe it is the 1000 Six speed transmission. Runs about 2500 RPM at 35 miles an hour if that helps to know...


First you need to have the codes read. When the light comes on it stores a code, even if the light goes back out. Transmissions run off various sensors, MAF, TPS, Transmission range sensor. One of these start messing up and so does the transmission, plus other engine related problems. Get the codes and let me know.Randy

Feb 27, 2011 | Chevrolet 2500 Cars & Trucks

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1996 dodge ram 2500 auto transmission not shifting properly


Well, first do the service. Pull the pan down and look for metal shavings. If there is metal shavings your in for a transmission. If not, you may have a problem with one of the transmissions shift solenoids located near the valve body.
P.S. The Duramax has the Allison 1000 transmission not the dodge cummins and they are one of the best trannys on the market.

Oct 29, 2009 | 1996 Dodge Ram

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

Having a problem with my allison md 3060 transmission


Hi mate I had the same problem with a camper once and the only way that you will ever stop it from shifting hard into gears down shifting or up is to take it into a Detroit Allison work shop and ask them to reset the throttle position and reset Un-adaptive shifts then to do an Fast-adaptive shift with the electronic tool called Allison Doc.

Ask them also to do a clutch report on the electronic tool, that will tell you straight away the condition of the box on the inside.

Thats the problem with these new electronic transmissions they force you to go back to the suppliers. If I had my book here I could have helped you with the fault code but you would have had to take it in any way to get all the parameters reset.

What happens is that when you buy this trans new they set it to UN-adaptive shifts then to fast adaptive then it learns how long the solinoids should be open and how quick to open them to have a good shift, but over a few ignition cycles the fast-adaptive changes to normal over a year or two the clutch plates wears with a few 001 and the computer cant keep up have to be reseted which is normal to them, expect to take it back every year or two to be reseted.

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Range shift inhibed display truck wont move


you can get the part you want from international truck dealer they are a warehouse for allison. it is gear selector switch it will cost you around $55.00

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