Drivers who have a Freightliner truck with a diesel engine may see the (Diesel Exhaust Fluid) DEF warning light come on from time to time. This light is telling the driver that the DEF level is low and needs to be refilled. While it may be tempting to ignore the light or reset it without filling up the DEF, doing so can result in costly repairs. In this blog post, we will explore how to reset the Freightliner Truck DEF warning light and why it’s important to keep the DEF level topped off.
What is the DEF Warning Light?
The DEF Warning Light is a dashboard light in newer model Freightliner trucks that illuminates when the truck’s diesel exhaust fluid (DEF) level is low. The DEF is used to help reduce emissions from the truck’s engine, and when it runs low, the warning light will come on as a reminder to refill the tank.
If the DEF Warning Light comes on, you will need to add DEF to the tank as soon as possible. You can purchase DEF at most truck stops or auto parts stores. Be sure to use only fresh, undamaged containers of DEF, and do not mix it with any other fluids. Once you have added DEF to the tank, the light should reset itself and turn off.
Why is DEF Warning Light Important on a Truck?
The DEF Warning Light is one of the most important lights on a truck. It is used to indicate when the truck’s diesel exhaust fluid (DEF) level is low. This is a very important fluid that helps to reduce emissions from the truck. When the light comes on, it means that the truck needs more DEF.
Without enough DEF, the truck will not be able to run as efficiently and may produce more emissions than normal. This can be harmful to both the environment and the truck’s engine. That’s why it’s so important to keep an eye on the DEF Warning Light and make sure that the truck has enough DEF at all times.
See also: Vw Bulb Failure Warning Light Reset
How to Reset the DEF Warning Light
If your Freightliner has a diesel particulate filter (DPF) system, you may see a DEF warning light on your dash. This indicates that the system is not working properly and needs to be reset.
Here’s how to do a Freightliner truck DEF warning light reset:
- Park your truck in a safe place and turn off the engine.
- Remove the key from the ignition.
- Press and hold the reset button on the dash for 5 seconds.
- Start the engine and check if the light is still on. If it is, repeat steps 3-4 until the light goes off.
If you have a Freightliner truck with a DEF warning light, it’s important to know how to reset it. Otherwise, you could end up with an unexpected repair bill. Luckily, resetting the DEF warning light is a relatively simple process that can be done in just a few minutes. So, if you’re having trouble with your Freightliner truck’s DEF system, be sure to check out our article on how to reset the DEF warning light. We hope this information helps you get your truck back on the road and avoid any costly repairs.
FAQs About Def Warning Light Reset Freightliner
What does it mean when the DEF light is flashing on a Freightliner?
When a DEF indicator light is flashing or blinking, it indicates that the DEF level is critically low. Refilling the tank should be done immediately in order to avoid any consequences that may arise from ignoring this warning. The utmost importance should be placed on refilling the DEF tank promptly and efficiently in order to continue operation of the vehicle safely.
What does a flashing DEF light mean on a 2014 Freightliner m2?
When the DEF Lamp and Solid Check Engine Lamp are flashing, it indicates that the DEF level is critically low, there is an incorrect type of DEF being used or an SCR system issue has been present for more than five hours. If this occurs, a driver should expect to experience a severe loss of engine power. It is important to address these issues immediately in order to avoid further damage.
Why is the DEF light flashing?
A flashing DEF Lamp signals that the DEF level is below a certain threshold and needs to be replenished. To restore the system’s proper functioning, it is necessary to refill the DEF tank. Additionally, when an On-Board Diagnostics (OBD) detects an issue with the emissions control system, it will cause the Malfunction Indicator Light (MIL) to illuminate. Reaching out to a qualified technician for assistance can help identify and remedy any underlying issues.
