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#1
11-27-2007, 09:58 PM
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Transmission Shift Issue
I have an very dependable 2000 GMC conversion van with 140K on it. Occasionally the check engine light comes on and immediately the automatic transmission starts shifting extremely clunky. I assume this is the indication of a vacuum issue somewhere but I don't have any way of reading the error codes. Anyone have a suggestion where I should look first?
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#2
11-28-2007, 01:24 PM
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Re: Transmission Shift Issue
You most likely have a transmission code being set and the tranny is going into limp mode (line pressure is increased to protect the tranny).
Most Autozones will read codes for free. //2000CAYukon
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