My truck won't down shift from low. 2005 Chevrolet 1500
It will shift into reverse and park, but when you put it in drive it won't downshift
to drive or overdrive?
Could be a few things, the shift solenoids are stuck for the drive circuits, the gear selector switch is not telling the TCM you want to go forward, the TCM is malfunctioning or the tranny is toast. A transmission shop is your best bet on getting this checked out, they can plug in and run a separate set of tests that can tell the tech if it is solenoids, switch, TCM or a fried tranny.
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