Allison 5sp: Allison trans problem on 2004-3500

usaflagwaver

New member
Dec 24, 2009
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HELP!!!
Got a P0708 code from my 2004 3500.
Reads..."transmission range sensor circuit high output".

Whats wrong with my truck?

Only shifts up to 3rd gear.

Is this a big deal, whats the fix?

Only got 300k on this eng/trans, can't be bad yet, right? :confused: