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Old 23 Oct 2017, 05:26 pm
Jeffz Jeffz is offline
Young Cruiser
 
Join Date: Aug 2014
Location: Mesa, AZ
Posts: 89
Default Replaced ECM, now trans downshifts different

I just replaced the PCM/ECM for throwing a lot of codes and the CEL on. The new one eliminated that problem, but the first time driving it, I noticed it downshifting
at about 25mph under braking. It never did that before. It's not hard enough to chirp the tires, but it even does it under pretty hard braking, which surprised me. This is the only difference, it upshifts normally and the kick down is fine.
Not likely at mount thing, happened too suddenly.
Possibly the TCM not communicating with the new ECM unit?
Is there a way to reset the TCM?
This is a 2003 GT (turbo) AT.
Thanks
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2003 GT Turbo AT
111,111 miles +
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