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I have a silly question? I am new to HP Tuners, and I was wondering in this photo is it saying that Pattern A is normal mode when the transmission is put into drive and Pattern B is Tow/Haul mode? And if so, why does the stock tune affectively have the torque converter lockup disabled while in tow/haul mode?
On my 2012 GMT900.. "Pattern Type" also says pattern A -> normal, and pattern -> B trailer.. but when looking at the actual tables (shift schedule, tcc) NORMAL is normal, and PATTERN A is Tow mode, PATTERN B is 4WD LO.
I'm thinking Pattern Type is just the setting on your tow mode button, and doesn't correlate with the shift patterns..
You can log shift pattern type or something along those lines in the scanner to know for sure.
Some applications are odd.. like a CTSV. The normal every day pattern in "D" is actually pattern B
Most trucks I've encountered are shift pattern A for normal "D" driving.
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