The “Service 4WD System” message indicates a problem with the 4WD system that should be properly diagnosed and repaired. When the ignition key is turned from OFF-RUN-START and is released back to the RUN position after the vehicle starts, the 4WD warning light should go on for 1 to 2 seconds and then go out.
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.
The four wheel drive light means your car has activated four wheel drive. If the Service 4WD light is on, there may be an issue with the system. by Spencer Cates on. September 09, 2016.
The 4WD switch light will indicate 2WD or Auto when drive engaged. … Cause: If the light stays on, or the “Service 4WD System” message is displayed, there is a problem with the 4WD system. The “Service 4WD System” message does not mean routine maintenance of the 4WD system is required.
Four-wheel drive vehicles demand rugged performance from their transmissions, especially when used for off-road driving or towing. … Our 4×4 services include: Draining and refilling the Transfer Case with fresh, clean fluid. Draining and refilling the Front Differential with fresh, clean fluid.
In some cases, no more than 30-36,000 miles. And in some cases it may be as frequently as every 15,000 miles. Also look for any kinds of leaks when you’re under it.
You will know your 4WD actuator is bad when the 4WD (either 4H or 4L) becomes difficult to engage, gets stuck, or fails to activate. Any of these symptoms means that your actuator is faulty and it should be checked immediately.
When the Service 4WD light comes on, it also shuts down the 4WD capability for the remainder of the drive cycle. This is a software issue and can only be corrected by flashing the computer’s memory.
An electrical fault such as a corroded wire or faulty 4WD dial/switch, A component failure such as a faulty transfer case module or actuator. A seized differential caused by poor lubrication. A leak in the vacuum hoses (older traditional 4WD systems)
The short answer is: Yes, it can be safe to drive in 4WD on the highway as long as you’re going very slowly and so does the rest of the traffic around you. In other words, only during severe road conditions that require you to.
Cheap way – To clear the codes and reset the computer, pull the 5 amp TCCM fuse, located at the bottom of the fuse box. Wait at least a half hour, and then replace the fuse. Turn the ignition key to run, wait for the 4×4 lights to blink, and then turn off. Repeat 5 times, and then start the truck.
When changing the differential fluid, the overall differential fluid change cost averages between $80-$150 for the rear and $70 to $130 for the front change, coming in at a total price of between $150-$280 for the differential fluid change cost.
IMPORTANCE OF 4X4 SERVICE
If you drive a vehicle with four-wheel drive, you know that you put it through a lot. Vehicles with 4×4 go off-road onto rough terrain and tow big loads-they need regular maintenance to make sure they can keep doing their work as efficiently as possible.
All-wheel drive (AWD) systems provide power to all four wheels, rather than only to the front or back ones. When driving, a majority of these systems have either a front or rear base, which means the power is focused there unless the vehicle begins to slip.
4-wheel drives need more maintenance because of the extra parts and the chassis can take a beating over time due to neglect or hard driving. If you are buying a used 4-wheel drive, let our technicians check it for cracks where the chassis outriggers join the main frame or rust, which indicates rough use.
Four-Wheel Drive Disadvantages
The main disadvantage of 4WD is added cost for purchase, maintenance, and fuel. The extra equipment (differentials, transfer case, etc.) adds complexity and weight to the vehicle, increasing initial market value, tire wear, and the cost of repairs and maintenance.
If your blend door actuator has gone bad in some way, it’s basically one of two problems. … If that happens, the blend door won’t work, and it’s likely your temperature will just be stuck on one setting with no ability to adjust the intensity up and down, or alternate between things like the lower vents or the defroster.
To reset a ESP BAS light, all you need to do is turn your car’s steering wheel to the right two times, turn it the left two times, and then return it back to the center so that your tires are facing forward.
How to Test: If you want to test your 4-wheel drive, then put your car into 4-wheel drive and then turn the front wheels, left and right, while driving in a tight circle at a very low speed. You should feel them bind up if 4wd is working.
With a modern 4WD, you can safely switch from 4Lo to 4Hi while driving, however, you will always need to stop before engaging 4Lo from 4Hi. Similar to sand, you want to drive in 4H since it offers you stability and you can build momentum as you track through the soft boggy mud.
Driving in 4Hi on Dry Pavement
So what happens when this phenomenon occurs to your 4WD? Drivetrain binding can result in all sorts of expensive damage from damage to u-joints, yoke failure, driveshaft twisting, and transmission torque build-up causing major damage to the internal gears.
It is not recommended to drive faster than 55MPH in 4WD high on low traction surfaces. 4WD should only be engaged when road surface traction is low. Driving in 4WD-Lo should not exceed 10mph.
Vehicles equipped with AWD or 4WD generally suffer a fuel economy penalty due to the extra weight and mechanical resistance of the equipment needed to turn all four wheels. In some cases, the reduction in gas mileage is small but can add up over time.
You can reverse in 4-wheel drive without risk provided you are driving on a low-traction surface. Driving forward while in 4WD is the same as reversing and the functionality inside the transmission and Transfer Case works the same in reverse.
Because the front and rear axles need to spin at different speeds on the road, you should activate 4WD only when your tires leave the pavement. That might be turning onto a dirt road or entering consistently snowy conditions, where the road surface is completely covered.
4-Wheel and All-Wheel Drive vehicles should have their transfer case fluid replaced every 30,000 miles to keep the small gears and moving parts lubricated and working properly.
The standard 30 AMP fuse that supplies power to the gear motor and shift control module.
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