03 Allison issue. HELP! - Diesel Bombers



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

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Old 03-02-2013, 03:06 AM
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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
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Old 03-03-2013, 08:43 AM
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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?
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Old 03-04-2013, 10:37 PM
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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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