05 lly range inhibit no dtcs

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happyduramax

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Aug 29, 2014
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I have a friend that has a 05 lly 5speed went to a concert and went to go home and all he has is reverse no forward gears even in manual .he unhooked his batteries didn't help installed new neutral safety switch on trans . same thing. unplug grey connector at tcm . still have reverse but no drive . it was driving fine before no problems. has rpm and input speed / turbine rpm any help would be great all it says range inhibit:confused:
 
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happyduramax

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Aug 29, 2014
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Yes. That was the first thing we did. A shop just put the trans in the truck. He said they put a used 07 trans in it. I know they had to change valve body for it to. Work could it be a valve body problem? But no codes He bought the truck off a local dealer .and trans went out a short time after That was there fixed
 
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happyduramax

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Aug 29, 2014
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Have a tech 2 what test can I run to help find the problem. I'm not a trans guy but want to learn I know enough to be dangerious. Lol.
 
Awenta

Awenta

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Sep 28, 2014
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Oh God....




On the other hand, the shop should have a warranty so take it back

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H

happyduramax

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Aug 29, 2014
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Could a valve be stuck in the valve body cause this .the one test I did per si said to unplugged the gray connector from the Tcm. Which I did and it didn't change still no forward gears even in manual mode .dont believe it to be a pump problem because I have reverse . That's why I haven't put a pressure gauge on it yet I guess I need to thank you all for the replies
 
Awenta

Awenta

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Sep 28, 2014
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Used a 5 speed nsbu right?


Why not keep it a 6 speed. Need the tcm from Suncoast afaik. Maybe someone can confirm that.

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happyduramax

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A gm dealer did the work . I'm comfortable working on it . It's easy to rebuild them or put shift kits and converters in them when they were working right ,just. Haven't worked on ones with problems .to know what's the best way to go to find the problem that's why I started this post for advise and ideas I too work at a gm dealer and we have never had one apart. Or anybody else at my work has to ask for advise
 
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happyduramax

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Aug 29, 2014
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have ign voltage 13.90 idling . if I unplug gray connector on trans still no difference . only have reverse . when I put it in reverse turbine speed goes to 0 ,when I put it in drive turbine speed doesn't change . if I put in drive and try to shift trans with tech 2 the scanner says doesn't know what gear its in and aborts the test . when I try to fast learn trans it aborts says engine speed to fast . could it be a c3 problem because it limps to third gear or a speed sensor . but by unplugging the connector on the trans it should be a hydraulic problem per si and still no dtcs and checked all fuses :confused:
 
Mike L.

Mike L.

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Are you checking voltage at the trans or at the engine? Normaly I see 12.65 volts at the trans.
 
H

happyduramax

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Aug 29, 2014
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with tech 2 looking at it in trans data . I didn't use a dvm at round connector at trans can do that tomorrow I been looking at it on my lunch break
 
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