How to Reset Exhaust Fluid System Fault

Last Updated on February 13, 2023 by Ryan

If your car has a message on the dash that says “Exhaust Fluid System Fault” it means that there is a problem with the diesel particulate filter (DPF) or selective catalytic reduction (SCR) system. To reset this fault, you will need to take your car to a qualified technician who can run a diagnostic test and determine what needs to be repaired.

  • Park your vehicle in a safe area and turn the engine off
  • Locate the exhaust fluid reservoir under the hood of your vehicle
  • Remove the cap from the reservoir and check the level of fluid inside
  • If necessary, add more DEF fluid to bring it up to the FULL line on the reservoir
  • Replace the cap on the reservoir and start up your vehicle
  • The system should now be reset and you should no longer see the fault message on your dash display

6.7 – Exhaust Fluid Fault Warnings

How to Reset Exhaust Fluid System Fault Duramax

If your truck is equipped with a Duramax diesel engine, then you may be wondering how to reset the exhaust fluid system fault. This system is responsible for reducing emissions from the engine, and it can sometimes become faulty. If this happens, you’ll need to know how to reset the system so that your truck can run correctly again.

The first thing you’ll need to do is locate the fuse box on your truck. Once you’ve found it, open it up and remove the fuse labeled “EXH.” This will disable the exhaust fluid system.

Next, start up your truck and let it idle for about 15 minutes. After this time has elapsed, turn off the engine and reconnect the EXH fuse. Finally, restart your truck and check to see if the system fault has been reset.

Exhaust Fluid System Fault Engine Idled

If you see the message “Exhaust Fluid System Fault Engine Idled” on your Chevy Cruze, it means that there is a problem with the DEF system. The engine will run for a few minutes and then automatically shut off. This is to prevent damage to the catalytic converter.

There are a few things that can cause this message to come up. One possibility is that the DEF level is low. Check the fluid level and add more if needed.

Another possibility is that there is something blocking the DEF line or tank. Check for any debris or leaks in the system. If everything looks good, then it’s possible that there is a problem with the DEF pump or injector.

In this case, you will need to take your car to a dealership or certified mechanic for further diagnosis and repair.

Speed Limited to 50 Mph Ford Reset

If you’re driving a Ford and your speedometer is reading 50 mph or less, there’s no need to worry – you haven’t been caught speeding. Instead, this is likely just a software glitch that can be easily fixed by resetting the system. Here’s what you need to do:

1. Pull over to a safe location and turn off your car. 2. Wait a few minutes before restarting your car. This will give the system time to reset itself.

3. Once you’ve restarted your car, check the speedometer again – it should now be working properly. If you find that your speedometer is still reading 50 mph or less after following these steps, then there may be another issue at play and you’ll want to bring your car into a Ford dealership or service center for further diagnosis.

Def Fault Speed Limited

If you’re driving a car with an automatic transmission, there’s a good chance you’ve heard of the term “defect speed limited.” But what exactly is it? In short, when a car’s transmission is in defect speed limited mode, it means that the transmission has been damaged and is no longer able to shift gears properly.

This can be caused by a number of things, but most commonly it’s due to either wear and tear on the transmission or because of a manufacturing defect. Either way, it’s not something that you want to happen to your car. When a transmission is in defect speed limited mode, the car will usually only be able to drive at very low speeds – often around 10mph or less.

This is because the transmission is no longer able to engage higher gears properly, so driving any faster would put too much strain on the system and could cause further damage. In some cases, a car in this mode may not be able to move at all. If your car goes into defect speed limited mode, the best thing to do is take it to a mechanic as soon as possible so they can assess the damage and make any necessary repairs.

Depending on how severe the damage is, they may be able to simply replace worn parts or they may need to perform a more extensive rebuild of the entire transmission. Either way, it’s important to get it fixed as soon as possible so you can get back out on the road again.

How to Reset Exhaust Fluid System Fault


How Do I Reset My Def Warning Lights?

If you’re looking to reset your DEF (Diesel Exhaust Fluid) warning light, there are a few things you’ll need to do. First, find the location of your DEF tank and make sure it’s full. If it’s not, top it off and see if that takes care of the problem.

If the light is still on, there are a few other things you can try. First, check all of your DEF hoses and connections to make sure they’re tight and not leaking. Next, check your DPF (Diesel Particulate Filter) for blockages.

If everything looks good there, then you may need to take your vehicle into a dealership or mechanic to have them run some tests and diagnoses on the system.

How Do You Clear a Diesel Exhaust Fluid System?

If your diesel-powered vehicle is equipped with a selective catalytic reduction (SCR) system, then it likely also has a tank for storing diesel exhaust fluid (DEF). DEF is sprayed into the exhaust stream, where it helps to break down harmful emissions before they exit the tailpipe. Over time, though, the DEF can become contaminated and need to be flushed from the system.

Here’s a look at how to clear a diesel exhaust fluid system. The first step is to remove the DEF tank cap and visually inspect the contents. If you notice any sediment or contamination in the tank, it will need to be cleaned out.

The next step is to disconnect the negative battery cable. This will help prevent accidental sparking while you’re working on the system. Once the battery cable is disconnected, find the SCR module and unplug all of its electrical connections.

With those connections removed, you should be able to access two hoses that lead from the SCR module – one going into the DEF tank and one coming out. Using a pair of pliers, loosen and remove the hose clamps from both hoses. Be careful not to damage either hose as you remove them.

With both hoses disconnected, place one end of each into a bucket or other container. Next, locate the purge valve on your vehicle – this will likely be located near the SCR module – and open it up fully. You may hear some air hissing out as you do this; that’s normal.

Once opened, start your engine and let it idle for several minutes until all of the DEF has purged fromthe system and into your containers. Once all ofthe DEF has been purged, turn off your engine and reconnect both hoses to their respective fittings onthe SCR module (making sure to use new hose clamps).

How Do You Reset the Def System on a Chevy?

It’s easy to reset the DEF system on a Chevy. All you need to do is locate the power module and remove the fuse. Once the fuse is removed, press and hold the start button for about 5 seconds.

This will reset the system and allow you to continue using your Chevy without any problems.

What Does Def Fault Mean?

DEF (Diesel Exhaust Fluid) is a solution made up of urea and deionized water that’s used in selective catalytic reduction (SCR) to reduce NOx emissions from diesel engines. When the DEF tank runs low or if the fluid is contaminated, the SCR system won’t work properly and the engine will go into “limp mode” with reduced power and speed. A “DEF fault” error message on the dash indicates a problem with the DEF system.

The first thing to do when you see this error message is check the DEF level in the tank. If it’s low, add more DEF according to your owner’s manual instructions. If the level is fine, then there may be a problem with the quality of the fluid itself.

Contaminated DEF can cause clogs and damage to SCR components, so it’s important to use only fresh, high-quality fluid. You can buy pre-filled containers of DEF or get it at many service stations.


If you have an exhaust fluid system fault, don’t worry – it’s easy to reset. Here’s what you need to do: 1. Start the engine and let it run for a few minutes.

2. Turn off the engine and disconnect the negative battery terminal. 3. Reconnect the negative battery terminal and start the engine again. 4. Check the exhaust fluid level and add more if needed.

5. Reset the system by pressing the button on the dash for a few seconds until the light goes out.


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