My 2011 Holden Colorado 4X4 will not stay in 4WD

If yours is a vehicle with the rotary knob that selects four-wheel-drive (rather than the old fashioned gear-stick method) then you might have a faulty or poorly adjusted switch. While these electronic switching systems were deemed to be an improvement for the driver, many find that the switches sometimes refuse to effect the desired gear or drive-mode selection which, if you suddenly find yourself needing to engage four-wheel-drive in a hurry, can be frustrating to say the least.

You may find some contact-cleaning spray might clean the switch up, but you may also need to remove the rotary switch to either clean it or replace it.

If the problem is not with the switch itself, you may have some other kind of electrical glitch or maybe even a mechanical engagement problem with the transfer-case.