2010 GMC Terrain: Mediocre Manual Mode
October 21, 2010
It's easy to miss, but our longterm 2010 GMC Terrain does indeed have a manual mode for the transmission. You first slot the selector to M and then use the rocker button to shift up or down. I suppose having a mediocre manual mode is better than none at all.
Mainly, it's reeeeaaaaally sluggish. At times it can take a good couple of seconds for the transmission to finally downshift after you've pushed the button. Too late. And then the downshift itself is pretty slow, with a lot of torque converter slushiness. Also, having to select M first is an additional step in the process that steering wheel paddles neatly sidestep. This last bit is not a huge deal, just sayin'.
The implementation of the Terrain's manual mode smacks of an afterthought.
Too bad, because the Terrain has so little engine braking when in D (what with the relentlessly fuel economy-minded transmission calibration) that its manual mode becomes more of a necessity than a gimmick.
Jason Kavanagh, Engineering Editor