Tranny issue

[Cowboy]

2009 H3T Alpha V8
For no specific reason at all, truck will not shift out of 1st gear. Speedometer stays at 0 and there is no compression (meaning that if you take foot off gas, it seems to neutral out). If I stop and put into park, then it seems to reset and all is good again.

The only thing I could think of was a bad vehicle speed sensor, which I replaced with no affect.

Any ideas?


Can't make it through the day? Back up, and get a run at it!

 

[amrg]

2009 H3T Alpha V8
For no specific reason at all, truck will not shift out of 1st gear. Speedometer stays at 0 and there is no compression (meaning that if you take foot off gas, it seems to neutral out). If I stop and put into park, then it seems to reset and all is good again.

The only thing I could think of was a bad vehicle speed sensor, which I replaced with no affect.

Any ideas?


Can't make it through the day? Back up, and get a run at it!

Any error codes? Im running an ISS (input speed sensor) error code and 2 days ago had the same issue, truck in 1st, doesnt shift to 2nd and the speedometer reads zero. Turned the truck off and back on, issue was solved.
Earlier, was getting a harsh first to second shift (sometimes) and its also related to the ISS. The issue stopped for a month so I thought it was gone (fixing it requires dropping the trans)

 

[Cowboy]

Had taken it to dealership and nothing came up. Stumped



Can't make it through the day? Back up, and get a run at it!

 

[K0PIR]

If the speed sensor isn't screwed in far enough it will do the same.

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