Transmission 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 09-22-2013, 01:27 AM
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Join Date: Sep 2013
Posts: 1
Default Transmission HELP!

So i am looking at buying an 03 Chevy 2500 but it is throwing a pressure sensor code from the trans. But the real issue is that it will only drive a few feet in drive then kick out of gear, but will drive in reverse. I want it and I am getting an amazing deal on it but please help.

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Last edited by duramaxdave; 09-22-2013 at 01:27 AM. Reason: Automerged Doublepost
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Old 10-05-2013, 12:31 AM
Diesel Bomber
Join Date: Dec 2010
Location: Fool's Golden State
Posts: 1,187

sounds like the pressure switch manifold (or more likely the NSBU switch - Neutral Safety Back Up) has gone kaput or a bad wire.

the NSBU is easy to replace and fairly cheep

more info: Question Allison 1000 Troubles?? - Chevy Truck Forum | GMC Truck Forum -

i would by the truck if the deal is good
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Old 08-19-2014, 11:13 PM
Join Date: Aug 2014
Posts: 1
Default tranny help.

I have a 03 LB7. With 101k miles. The truck is 2 wheel drive. It often won't come out of gear. The light indicator. Or linkage. Flashes and the message center reads. SHIFT RANGE INHIBITED?. Yesterday the truck took about 1/4 tp shift out of first. At a steady 2,200 rpm. Runs fine after that. Untill i shut it off and start it again. Where is this sensor located
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Old 08-20-2014, 01:30 PM
Diesel Bomber
Join Date: Dec 2010
Location: Fool's Golden State
Posts: 1,187

possibly the nsbu switch

also, check fluid level and filter. doesn't sound like a sensor to me
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