Diesel particulate filters are projected to decrease soot emissions by as much as 80%. When the DPF filter flops down, the DPF warning lights will come on. It shows a partial blockage in the filter.

How to get Rid of Soot blockage

  • You have to vacant your DPF regularly in order to have the best performance.
  • In order to vacant your DPF, you have to burn off the composed soot.
  • Soot is burned off at an elevated temperature by driving at a speed of more than 40 miles per hour for roughly around ten minutes.
  • When the soot is being burned off, you may see that you get a burning smell from your exhaust, your idle speed is greater, and your fuel consumption is also greater.
  • If the soot is not burned off, you will notice a decline in your oil quality. You have to make sure that your oil level does not exceed above the maximum measured level because if it does, you could damage your engine.

Can you drive when your DPF light is on?

Yes, you can. We have discussed all the cases in detail in the latter half of this articles. You are not likely going to be injured. Your engine, though, is another thing. If you overlook the DPF light, and you stay driving in your typical ‘gas/brake’ pattern, you will perhaps end up seeing other warning lights come on. Then, you will have to see a mechanic for what is called ‘forced’ regeneration. If you do not notice this, then the soot load is just going to keep on growing.

Finally, your car will stop running appropriately, and at that point, yes, you will have to look for at a safety issue, because you will notice reduced performance levels when you are trying to do drills like passing and merging on the highway. You will also likely end up suffering very expensive repairs.

Never overlook your DPF warning light. You will have slight time between the point where the DPF is slightly blocked and the point where manual regeneration is the only way out. And if you fail to have the manual regeneration completed, it is very probable that you will need a fresh engine.

Monitoring DPF warning light status:

  • Light is on steadily

This is your first warning that your engine may need regeneration. You probably have quite a few more hours to operate the truck before the engine switches to de-rate. You can execute an automatic, or passive, regeneration by driving your truck at a constant highway speed.

As you’re driving, sensors touch the exhaust back pressure and mechanically inject extra fuel to rise the temperature in your DPF, burning off collected soot. Or your truck may be furnished with an integrated oxidizing catalytic converter which achieves the same thing.

  • DPF status light is flashing

This is your second warning, and it’s more crucial. It’s indicating you that a parked regeneration is needed, and you need to achieve it as soon as possible. If your Check Engine light comes on while the DPF status light is blinking, it means you need to execute a parked regen right away. You may also get a beeping sound to furthermore alert you.

Here’s what is needed to be done by you:

  1. Park your means of transportation. Pull it well off the highway – not in a grassy area or where there are flammable or combustible materials close.
  2. Display the distinctive hangtag that declares “Caution – parked – DPF regeneration in progress.”
  3. Place your transmission in neutral.
  4. Put on your parking brake.
  5. Discharge the parking brake and then re-apply it.
  6. Press and release the clutch pedal, if you have one.
  7. Press the REGEN button on your dashboard and clamp it for a moment.

The regeneration process takes somewhere around 20 to 40 minutes to complete. During that time your engine RPM will upsurge, but it will return to normal when regen is done. You may also see the High Exhaust System Temperature (HEST) light, which just means what the name specifies. The light should go out when regeneration is over.

  • The Stop Engine light

If you don’t execute the required regeneration as desired, your DPF will become clogged, which will harm your engine. If you see this light, shut down your rig instantly and call for roadside help. You should always have the required material that explains the steps for a parked regeneration, so you always have the facts with you. Ultimately, you’ll have to remove and clean your DPF.

It’s made of ceramic material, which is very tough, and if you’re following your OEM’s recommended regeneration procedures, the filter will work fine for an extended time. But eventually, it will need manual dusting.


Visit Homepage for latest updates and Technical articles: Automotive Electronics

Visit  our forum to discuss: Automotive Electronics Forum

This article was written by Vineet and Eeshan Bashir for any correction or guest article mail us at contact@automotivelectronics.com



Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.