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Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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So one day going to work the truck loses gears. Only has park and 5th also got a check engine light. Found a bad wire to the neutral safety switch so I fixed that, clear code for a few days then the problem is back. ... JOIN NOW TO REMOVE TRACER

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  #1  
Old 03-02-2013, 03:06 AM
Diesel Fan
Status: Project Push Pull

   

Default 03 Allison issue. HELP!

So one day going to work the truck loses gears. Only has park and 5th also got a check engine light. Found a bad wire to the neutral safety switch so I fixed that, clear code for a few days then the problem is back. Put a new NSS in it and still same problem. Checked cleaned and greased all connections when I did it. Made it a few miles and then the problem is back. Put another NSS in to eliminate the. Chance of a junk new part and still same problem.

What else can I do here? Anyone else been down this road before? Thanks much

BTW truck is bone stock except Edge JWA that doesn't get set above 4

GrudgeGuy's Sig:93 W250 reg cab LE, new white and gold paint - built pump, non IC DV's, Denny T 2 pin, 366 spring, ported and ground internals, screw maxed, timing bumped, BD 40hp injectors, Mebuilt mandrel bent CAI, 16cm housing 4" turbo back, Holley LP, good power and tows the 74 Duster with ease
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Old 03-03-2013, 08:43 AM
Diesel Fan
Status: Cummin Stroke on This DURAMAX!

   

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Check your tcm
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Old 03-03-2013, 09:05 PM
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What about the NSBU?

Hotforteacher's Sig:2002 Crew Cab Short bed 4x4 LB7. Air box mod. Air horn mod. EFI live with DP5. 4" MBRP no muffler with 5" tip. Glow shift EGT and Boost guages. Leveling kit. 285's. Just a low budget build to tow my trailers and have some fun at the same time.
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  #4  
Old 03-04-2013, 10:37 PM
Diesel Fan
Status: Project Push Pull

   

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Turns out it flattened a pin when being plugged back in. Getting a new harness and a GM NSBU for peace of mind and hopefully be on my way.
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