This has been around a while, but still a great feature if you're going to park your truck for an extended period and would like to save your battery -
Transport Mode
To turn the Transport Mode On/Off, it will be necessary to start the vehicle, activate the hazard flashers, press the brake pedal (automatic transmission) or clutch pedal (manual transmission) then press and hold the Start/Stop button or turn the ignition key to the crank position for 15 seconds. (The engine will turn OFF on push button vehicles.) The same steps are used to turn on the feature.
After the Transport Mode is enabled or disabled a message will appear in the DIC.
Bought this new 2018 Sierra SLT 1500 on New Years Eve -
and brought it home to it's place next to my 3500 Roadtrek 4x4 -
On new years day I took my girl out for a drive near Pikes Peak -
Let the mods begin!