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02 GMC won't shift gears automatically
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Haleysdad
New User
Feb 18, 2011, 7:17 AM
Post #1 of 2
(4147 views)
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02 GMC won't shift gears automatically
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2002 GMC Sierra automatic 2wd won't shift on its own while accelerating. Everything else works great except that it won't tell itself to shift appropriately. I have to let off the gas to make it shift up. 177k miles on the clock, had a new engine put in but not sure if tranny is original or not. Haven't tried anything yet -- mechanics are telling me I need to spend $1300-1800 to have it rebuilt. Any ideas before I make the leap to a full rebuild or replacement?
(This post was edited by Haleysdad on Feb 18, 2011, 7:19 AM)
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zmame
Veteran
/ Moderator
Feb 18, 2011, 5:06 PM
Post #2 of 2
(4134 views)
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Re: 02 GMC won't shift gears automatically
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my truck is a 03 there was a TSB i think for harsh Sh!t 1-2, 3-4 gear ended up being Solenoid, pressure Control and re-flash PCM and my problem went away.. Your vehicle might be affected under this TSB too. i think its any truck with 4L60E in that era but im not sure
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