ABOUT 4-WHEEL STEER

Here is what out-of-phase and in-phase steering look like:

The angle at which your rear tires turn depends on your front steering angle and the vehicle’s speed. 

There is a limit to how far the rear wheels will turn – the maximum angle depends on your vehicle.

To turn Rear Steering off, you have to be driving slower than 1.2 mph (2 kph).

On certain GMC HUMMER EV models, press the physical 4-Wheel Steer button on the left side of the Driver Mode Control dial.

On other vehicles, open the Controls app on your infotainment screen, then tap the Rear Steering button and select Off Mode. Press either button again to turn Rear Steering back on.

Some vehicles offer Off-Road Mode and Terrain Mode. At lower vehicle speeds, Off-Road Mode uses a different out-of-phase steering calibration than the default Automatic Mode, offering more maneuverability on rough terrain.

Terrain Mode rear steering features similar operation as Off-Road Mode (rear wheels turn out of phase with the front at lower vehicle speeds). However, the ratio of front-to-rear steering angle is further increased in Terrain Mode, delivering even more responsive steering.

CrabWalk is a 4-Wheel Steer setting that allows the rear wheels to turn at the same angle as the front wheels. This allows you to move your vehicle diagonally, offering flexibility in both off-roading situations and various parking scenarios.

For example, if the rear of your vehicle is facing an obstacle on the left side, and you need to turn your vehicle to the right to get around it, you might risk colliding with the obstacle in Automatic Mode.

In CrabWalk, you can move the vehicle diagonally to help avoid collisions with objects within your turning radius.

As with other 4-Wheel Steer modes, there is a limit to how far your rear wheels will turn: The maximum angle depends on your vehicle. 

If you drive in CrabWalk above 25 mph for more than 10 seconds, 4-Wheel Steer will go back to Automatic Mode.

Learn more about GMC CrabWalk here.

GMC King Crab Mode is a HUMMER EV 4-Wheel Steer setting that allows the vehicle’s rear wheels to turn more quickly than its front wheels to create a drifting sensation without reaching vehicle handling limits. It maximizes capability with tight maneuvering for off-road trails and precise rear tire positioning.

This could be useful when, for example, you want to position the rear wheels for maximum traction in a boulder field without disturbing the front wheels' position.

Note: You cannot switch directly between King Crab and CrabWalk modes. King Crab must be disengaged, and you must be in either Automatic or Fixed mode before engaging CrabWalk. Likewise, CrabWalk must be disengaged, and you must be in either Automatic or Fixed Mode before engaging King Crab Mode.

Learn more about King Crab Mode here.