Duramax Diesels Forum Truck of the Week
  #1  
Old 11-09-2018, 08:20 PM
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DylOrr DylOrr is offline
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Default LB7 reverse issue

Im having an issue with an 03 LB7. It goes into reverse then immeadiately kicks out into a neutral. If you touch the throttle it kicks in really firm and the second it goes back to idle it kicks out of reverse. There is no codes, checked with tech 2. It finally gave me a range shift inhibited but no codes. It up shifts and downshifts very firm as well. It started out of nowhere, nothing leading up to it. Any help or direction is appreciated
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Old 11-09-2018, 09:47 PM
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Nbsu switch gone bad?
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Old 11-09-2018, 11:13 PM
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I thought about that. I have a plethora of parts hanging around i might throw one on it and see

But on the tech 2 everything seems to read fine, it seems more of a pressure issue than electrical to me
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Old 11-10-2018, 06:59 AM
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Might try bumping the two tcm connectors with your fist or something. Mine was doing almost the same thing. Had a bad connection there. Worth a try anyways
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  #5  
Old 11-10-2018, 09:19 AM
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Maybe a blown out C3 piston.
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