you could have a leaky or damaged transfer case.
99 times out of 100 the switch on the dash has failed, replace it first.
why is my service 4 wheel drive light on on my 2008silverado
the front diff is not engaging its not the transfer case which is manual the solenoid needs replaced
It means there is no output from your ECM (Engine Control Module). You need a new one.
The light that comes on when 4 wheel drive is engaged is not the service light. It is just an indicator light that comes on to let you know the 4 wheel drive is engaged. It will go off when the 4 wheel drive is disengaged.
There are a number of things that can cause this, mostly electrical sensors. The first thing to check are the ABS (anti lock brake) sensors, there is one at each wheel. These are usually behind the brake rotor, and you can find them by following the wire you see near the brakes. For tons of car videos, how-to tutorials and tips on saving money, visit my site TheFreeMechanic.com
You can drive your car with the yellow 'service engine' light on the dashboard, but it is not recommended. This light warns you of the need to have the engine serviced.
It is best to be stopped. Pull the 4wd lever backwards into 4wd and the icon on the dash should light up. If this doesn't work there is a problem with this system.
There can be several causes for the service emissions systems light to come on in a Ford Escape. The light can indicate an 02 sensor is out or it can indicate an exhaust leak.
service engion soon light is on
In some vehicles, it is possible to reset the four-wheel drive service light by turning on the ignition, but not starting the car. The gas pedal should be pushed repeatedly a few times. Alternatively, a dealership can reset the light.
the transmition needs to be service