Question

What is a TCM on a Duramax?

Answer 1

The shift inhibit means that its not seeing the input speed pull down when you select range. Common causes 1) T-case is in neutral or broken (does the truck roll in park?) 2) low on fluid 3) a piece of debris is lodged in the valve body spacer plate.Dec 17, 2012');})();(function(){window.jsl.dh('14','

Range Shift Inhibited - 06 Silverado Duramax 4WD | Diesel Place

https://www.dieselplace.com \u203a threads \u203a range-shift-inhibi...

https://www.dieselplace.com \u203a threads \u203a range-shift-inhibi...

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Search for: What is a Nsbu switch?

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The NSBU switch mounts directly onto the transmission housing, from the outside, and detects the angular position of the shift selector shaft. This position is communicated to the TCM so that certain vehicle control functions can be coordinated with the position of the shift controls.