Re: Tow Button vs +/- on gear shifter
Towing a trailer requires a bit more power (torque) from the engine to pull the added weight. With the tow button engaged, the transmission will stay in a lower gear longer to give that added power. The tow button is most commonly used with the transmission in 'D'rive. The tow button adjusts shift points automatically, whereas the +/- button (with transmission downshifted to 'L') can override any automatic function. If you knew exactly how the tow function was programmed, you could duplicate it manually with the button.
2007 Acadia SLT-2, 'HiYo' Silver outside, Titanium/Ebony inside, no NAV, no HUD, no errors