Hello,
I am having a problem with the transmission shifting early on the 2 - 3 shift at WOT. It is not matching the tuned shift points. The computer is commanding it, so I wouldn't think it would be the transmission. The 1 - 2 shift is at about 40 mph and 5800 RPM, 2-3 is at 3900 rpm and 49 mph. It should be 67 mph or 6000 rpm. There are no codes set, but the vehicle has had a flashing service engine light occasionally. Any thoughts? I have attached the tune file and date log.
Thanks. 06YukonSamPaulNewEngineVE11MAF6ShftPnts.hpt06YukonSamPaulNewEngineVE11MAF6ShftPntsEarly2-3.hpl