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I just wanted to ask you guys can't I still be throwing codes even though i am not getting a check engine light?

My 2013 gt auto transmission is downshifting rough like every second even If i back off the gas a tiny bit it downshifts and as soon as I get right back on it jerks and up shifts?

I have had the tcm update done already and it did not help.

I saw there was a tsb for mechanical part replacements on the hma site so I am wondering if maybe that's my problem even though I am not throwing any codes.

Thanks

Jim
 

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Get your TSB done. At least that will be out of the way. If you're still having problems. Come back and let us know. We'll find a solution. But to answer your question. The computer stores warnings in itself. Only when it passes a certain threshhold will it acutally error and give a code.

You might not be there yet. Still though, TSB.
 
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