Duramax Diesels Forum Truck of the Week
  #1  
Old 05-17-2017, 09:43 PM
Dennis,max Dennis,max is offline
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Question Truck doesn't go into gear

I have a 2001 Chevy Duramax has the Allison trans. Wouldn't move the indicator on the dash would just flash so changed the nsbu switch and no difference, had the tcm flashed and reprogrammed and still nothing so I changed the ignition switch and the truck then went into gear but took a few seconds before it kicked in then went back to not moving and just flashing on the dash. Also if I unplug the 4 pin wire connector on the nsbu switch the truck will move but only in limp mode. Any help would be awesome this truck has had me spinning for awhile now
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Old 05-18-2017, 07:45 AM
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Chevy1925 Chevy1925 is offline
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Pull the codes and quit throwing parts at it hoping it will fix it
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Old 05-18-2017, 07:05 PM
Dennis,max Dennis,max is offline
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The truck doesn't set any codes
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Old 05-18-2017, 07:08 PM
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What are you using to ck the codes with? Cheapo scan tools normally won't pull allison codes.
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Old 05-18-2017, 07:10 PM
Dennis,max Dennis,max is offline
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Snap on Ethos, the check engine light doesn't even come on
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Old 05-18-2017, 07:21 PM
Dennis,max Dennis,max is offline
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I can get the truck to move but once I do I can't go far and it will just quit moving and the gear selection flashes but truck won't move unless I cycle the key a few times
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Old 05-18-2017, 08:08 PM
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Chevy1925 Chevy1925 is offline
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You have codes, you just have an electrical issue going on that needs to be address. Start at the Tcm and follow the wiring back looking for frayed or cut wires.

Did you put the nsbu in as the instructions stated?
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James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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Old 05-19-2017, 02:59 AM
Dennis,max Dennis,max is offline
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Yes I did and checked all the wiring the dealership I took it to to get tcm flashed look over the wiring as well and didn't see any problems
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Old 05-19-2017, 06:22 AM
Blackmax123 Blackmax123 is offline
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Start simple. Have you checked the oil level?
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Old 05-19-2017, 06:46 AM
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May be plugged sump filter.
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Old 05-19-2017, 06:56 PM
Dennis,max Dennis,max is offline
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That's the internal filter right?
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Old 05-19-2017, 07:44 PM
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Yes. Pull codes or have someone with a tech II actually look at data when problem occurs
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  #13  
Old 05-21-2017, 05:08 AM
Dennis,max Dennis,max is offline
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I have
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