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Discussion Starter · #1 ·
I have a 2004 Mazda 6i. It is having problems shifting. it goes up through the gears too fast and wont come back down when i brake. When i switch into Manual mode the gear indicator on the dash disappears and it doesn't seem to want to shift at all. The only way to get it to come back to first is to stop and shift to Park and then start again. There is no "Check Engine" light and after connecting an ODB2 it doesn't seem to be throwing any codes. From asking around consensus is it's the TCM.
My question is can it be the TCM even if its not throwing any codes?
 
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