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| 01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect |
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05-07-2008, 08:53 PM
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eBay Motors
#11 (permalink)
| | Junior Member
Join Date: Mar 2008
Posts: 27
| I dont remember if the indicator was flashing or not, did not really pay attention to that. So I just need to check to make sure that it is still pluged in and not dirty, or is there a way to check if it is bad?
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2002 Chevy 2500hd Ext. cab 4x4, Red, 4" exhaust no muffler | 
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05-07-2008, 08:56 PM
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eBay Motors
#12 (permalink)
| | Duramax Forum Moderator
Join Date: Oct 2007 Location: Greenville, KY
Posts: 1,864
| I am not real familar with all the problems and fixes for the NSBU. Do a search on hear for NSBU switch and there will be tons of thread that pop up that can help you. http://www.duramaxforum.com/forum/se...searchid=86856
__________________ KYLE
05 Chevy LLY Crew Cab LT Dually 4x4, Crank it up Diesel Tie rod sleeves and centerlink, BD Diesel Remote Fuel Filter, EGR Blocked, TTS Dual Lift Pumps, FPRV Shim, Bullydog Outlook Monitor, AFE Stage 2 CAI, BD Diesel Manifold, Diamond Eye Turbo Direct Pipe, Diamond Eye 5" exhaust straight piped, Level Kit, Suncoast Stage IV w/ 1056 Torque Converter and Allison Deep pan EFI Live is on the way!!!!
1981 VW Rabbit Pickup, 1.6L Diesel, 4 Speed Manual, 35 MPGs | 
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05-07-2008, 09:02 PM
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eBay Motors
#13 (permalink)
| | Junior Member
Join Date: Mar 2008
Posts: 27
| Ok Thanks. Will check those things out and get back to ya
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2002 Chevy 2500hd Ext. cab 4x4, Red, 4" exhaust no muffler | |
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05-07-2008, 09:03 PM
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eBay Motors
#14 (permalink)
| | Junior Member
Join Date: Mar 2008
Posts: 25
| on a 02 the indictator will not flash it just doesnt have the line under the D for drive | |
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05-07-2008, 09:17 PM
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eBay Motors
#15 (permalink)
| | Junior Member
Join Date: Mar 2008
Posts: 27
| Just drove the truck and the indicator has a green square around the D for drive but no line under it, should there be a line or just highlighted like it is? I never looked before I had the problem.
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2002 Chevy 2500hd Ext. cab 4x4, Red, 4" exhaust no muffler | |
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05-08-2008, 08:50 PM
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eBay Motors
#16 (permalink)
| | Junior Member
Join Date: Mar 2008
Posts: 27
| Checked the NSBU, it seems ok, no dirt or loose connections. Called local chevy dealer and they said they have never heard of this switch. Does it have another name? The trans filter looks new but I think I might go ahead and change it anyway. I drove the truck again today, but did not get the two trans error codes again, any possibility that it was just a fluke?
Also is there a way to check the glowplugs or the glowplug relay? After I clear the P0380 code and start it about three times it will come back on.
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2002 Chevy 2500hd Ext. cab 4x4, Red, 4" exhaust no muffler | |
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05-08-2008, 09:13 PM
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eBay Motors
#17 (permalink)
| | Junior Member
Join Date: Mar 2008
Posts: 25
| One of the most common problems with the Allison transmission is failure of the Neutral Start Back Up switch.
Some of the symptoms of failure include but are not limited to:
No start condition
Gear shift indicator on dash not following properly
Trans stuck in limp mode or fail safe
DTC's set indicating pressure switch codes | |
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05-15-2008, 06:09 AM
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eBay Motors
#18 (permalink)
| | Junior Member
Join Date: Feb 2007
Posts: 28
| Had the same thing happen to me in April. Pulled over, checked it out started back up and no light.
Last week, it acted up again with the service light coming on and the tranny acting funny.
Pulled over, let it sit and drove from Phx to LA no problem whatsoever.
Following day, same problem. Limped it back to Chevy and my tranny is dust. Said it burnt up. $4200 later, I wish I woulda thought more about the Service light in April.
Hardly ever tow with it and used Valv Dex/Merc ATF to change all fluids back in Oct. Hope that didnt do it. | |
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05-17-2008, 06:24 PM
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eBay Motors
#19 (permalink)
| | Junior Member
Join Date: Mar 2008
Posts: 27
| While driving today had the trans act up again. I was passing a few cars and when it kicked down it jerked a little then when into limp mode with the SES light on agian. Checked with dealer I got it from and said they replaced spin on filter before selling. Does this still sound like the NSBU switch???
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2002 Chevy 2500hd Ext. cab 4x4, Red, 4" exhaust no muffler | |
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05-18-2008, 05:42 AM
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eBay Motors
#20 (permalink)
| | Duramax Forum Moderator
Join Date: Oct 2007 Location: Greenville, KY
Posts: 1,864
| Sounds like you slipped the clutches. Did it kick down into 3rd gear and hang there?
__________________ KYLE
05 Chevy LLY Crew Cab LT Dually 4x4, Crank it up Diesel Tie rod sleeves and centerlink, BD Diesel Remote Fuel Filter, EGR Blocked, TTS Dual Lift Pumps, FPRV Shim, Bullydog Outlook Monitor, AFE Stage 2 CAI, BD Diesel Manifold, Diamond Eye Turbo Direct Pipe, Diamond Eye 5" exhaust straight piped, Level Kit, Suncoast Stage IV w/ 1056 Torque Converter and Allison Deep pan EFI Live is on the way!!!!
1981 VW Rabbit Pickup, 1.6L Diesel, 4 Speed Manual, 35 MPGs | |
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