Yes, your vehicle will typically still drive with the Service 4WD light on, but that doesn't mean it is safe to ignore. In most cases, the truck or SUV will continue operating in two-wheel drive while the fault is present. However, your four-wheel drive system may not engage when you actually need it — such as in snow, mud, or on slippery roads. Continuing to drive without getting it checked can lead to bigger problems, including damage to the transfer case or transmission. Think of it like a check engine light: the vehicle moves, but something needs attention. Have the system diagnosed by an auto repair technician as soon as possible to avoid a more expensive repair.