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Re: Older ALLISON (WT) Transmissions
Posted to HD/Fleet Forum on 6/13/2004 7 Replies

Mike,

To clear codes with the push button shifter, press the up and down arrows together to enter diagnostic mode. Now press and HOLD the mode button until the mode light flashes for the SECOND time. This takes about 10 seconds. Turn the ignition key off, wa... Login to read more.

7 Replies Received (View Replies)