Trailer Mode will not activate

KV Bruce

New Member
2005 2500 6.6 diesel, Allison Transmission.
Pressing the button on the shifter handle will not effect the trailer mode option or the no-overdrive option.
Am I missing something easy? Any help would be appreciated. Bruce
 

Mooseman

Moderator
Maybe the switch? If you have a manual with schematics, see what wires send the signal and if the circuit closes when you press the switch.
 

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