Difficulty Level: Intermediate  |  Time Required: 5 minutes  |  Tools Required: None  |  Related Parts, Products, Services or Technology: 

Locking Differentials, also known as “lockers,” allow you to lock the wheels of an axle together, forcing them to turn at the same rate. This feature allows you to either lock only the wheels of the rear axle, or lock both the wheels of the rear axle and the wheels of the front axle.

When the axles are locked, equal torque is sent to each wheel. This is designed to enhance your vehicle’s traction in off-roading scenarios when each wheel might experience different traction situations.

In Terrain Mode, you can lock both the front and rear axles for maximum traction capability.


Locking Differentials on the GMC HUMMER EV Pickup Edition 1 will consist of a front electronic locking differential (or eLocker) and a rear virtual locking differential.

Locking Differentials.

A virtual locker uses software to lock the two motors that power the rear wheels together, rather than a physical vehicle system. The result is the same as a mechanical locker. This feature lets you lock wheels together on their axle, forcing them to turn at the same rate. This allows you to apply torque through both wheels even if one wheel has less traction than the other.

This can be helpful in certain off-roading situations when one wheel may be suspended in the air or on a different kind of surface than the other on the same axle.

When engaged, the front locker disengages automatically above speeds of approximately 24 km/hr. The rear locker is available at speeds of up to 80 km/hr when Terrain Mode is engaged.

How to Use Locking Differentials

To engage the lockers:

  1. Press the corresponding button on the centerstack. You’ll see a rear-only button and a button that engages both front and rear lockers simultaneously.
  2. Your vehicle must be in Terrain Mode to engage both the front and rear lockers. The button must be held down for at least 5 seconds to engage both lockers.
  3. You can see the status of your lockers in the Off-Road app on your vehicle’s infotainment system by selecting the CHASSIS widget.
  4. You can press the centerstack buttons again to disengage the lockers. The lockers will also disengage when you hit the appropriate speed limit.

To find out if your vehicle has this feature, contact your dealer or refer to your vehicle’s equipment list. Please check your Owner’s Manual for more information about features. 



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