What Does the Four Wheel Drive Warning Light Mean? | YourMechanic Advice

What Does the Four Wheel Drive Warning Light Mean?

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Anyone who off-roads for a hobby knows that four wheel drive is a must have. Unlike two wheel drive cars, vehicles equipped with four wheel drive (4WD) have a transfer case that takes the power from the engine and sends it to the front and rear wheels. Most four wheel drive vehicles also have a low and high range depending on the situation. Even though there is a button or shifter that is used to activate four wheel drive, auto makers include a light on the dash to let the driver know what setting is being used.

What the four wheel drive indicator light means

When you engage the four wheel drive, a corresponding light is illuminated on the dash. Vehicles with multiple gear ranges will also indicate what range has been selected. High and low are commonly abbreviated to “hi” and “lo” respectively. Some vehicles may only have an indicator for low range as high range is the default. Refer to the owner’s manual of your vehicle for specific information on your four wheel drive system.

Newer model vehicles have started using electronics to control the four wheel drive. Some of these electronically controlled systems have a 4x4 automatic mode. This mode keeps the vehicle in two wheel drive mode for most of the time until extra traction is necessary. The car’s computer monitors the wheel's rotational speeds and if it notices any slipping, it will send the power to all four wheels to keep the car moving.

Vehicles that have four wheel drive systems tend to have a separate light to indicate an issue with the system. Usually labeled “Service 4WD”, when this light comes on, a code will be stored in the computer’s memory to help identify any issues. Depending on the problem, the four wheel drive may be disabled temporarily. Sometimes if you haven’t used four wheel drive in a while, the computer may think that the transfer case isn’t lubricated properly. If your Service light turns on, try engaging the different gear ranges and driving around a little bit to move the oil around. Hopefully, the next time you start the engine, the light will be off.

Is it safe to drive with the four wheel drive indicator lights on?

Using four wheel drive in slippery situations makes a huge difference to the vehicle's driveability. You should never engage four wheel drive on dry pavement. Four wheel drive requires some slippage to occur between the front and rear wheels which is why it’s perfect for gravel, snow, and sand. On dry pavement, the grip prevents any slipping from happening and enabling four wheel drive will overstress the drivetrain. Vehicles equipped with automatic four wheel drive switch between the modes on demand so you don’t need to worry about switching it yourself.

If your service light is on or if your four wheel drive system doesn’t seem to be working properly, ask one of our certified technicians to help you diagnose any problems.


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Travis

12 years of experience
426 reviews
Travis
12 years of experience
Volkswagen Beetle - Warning Light is on - Stillwater, Minnesota
Unbenoest to me when you change a battery on a 18 yr. old car you also need more than a code reader to reset the new battery.
Audi A8 Quattro - Warning Light is on Inspection - Minneapolis, Minnesota
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10 years of experience
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Nicholas
10 years of experience
Chrysler 300 - Warning Light is on - Durham, North Carolina
Excellent diagnostician. Knowledgeable and caring. Created a desire for him specifically, to do the job. Hope we get him every time!
Honda Accord - Warning Light is on - Garner, North Carolina
I was very happy with Nicholas and his knowledge and expertise about diagnosing the issues with my car. He is honest, reliable and professional. He is now my Mechanic that I will call on for all my car's needs.I will also recommend him to my friends whom have been taken advantage of by other car shops as I have been, and are looking for someone honest , that will not take advantage of them Thank you so much Nicholas for resolving my issue with my car. I feel relieved and happy with the outcome

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15 years of experience
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Robert
15 years of experience
Chrysler 300 - Warning Light is on - Maricopa, Arizona
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26 years of experience
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Arturo
26 years of experience
Volvo XC90 - Warning Light is on - El Cajon, California
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