The storage tank is usually found either next to the diesel fuel tank on a truck, or near the area of the spare tire on a car. All vehicles with diesel engines meeting 2010 or later EPA guidelines have a dashboard warning system that alerts you when the DEF level is low.
The light bar indicates the level of fluid in the DEF tank. Low DEF levels will trigger a decrease in engine performance. The use of improper fluid will trigger a decrease in engine performance. In the empty and ignored state, vehicle speed will be limited to 5 mph until DEF is detected in the tank.
Making sure you do not run out of DEF in a SCR equipped truck is simple – watch the DEF gauge, which is part of the diesel fuel gauge, for when it is time to refill. DEF is stored in a dedicated tank next to the fuel tank on the driver’s side.
How do I check my DEF fluid level? – Related Questions
Can you overfill DEF fluid?
Do Not fill beyond this connection. The neck of the tank acts as a breather tube for DEF. If it is “capped off” by overfilling, the DEF within the tube crystalizes. Crystalized DEF prevents air from entering the tank.
Should I keep my DEF tank full?
If the DEF tank contains less than 5% of its capacity, the equipment engine power will de-rate. Enough power will be available, however, to travel a short distance, so that you can add more fluid to the tank. The DEF tank needs to be filled once for every 3 to 4 times that you refuel with diesel fuel.
How do you check the DEF level on a 2011 Duramax?
How do I reset my service exhaust fluid?
Reset the exhaust fluid system
Turn on the scanner and navigate to “Module Setup.” Then, go to “Reductant Fluid.” Thereafter, move to “Tank Level Reset” and reset the system. This will reset the warning to “None.” After that, navigate back to “Reductant System Data Reset” and engage the reset again here.
What does it mean when my DEF light is blinking?
A flashing/blinking DEF indicator light means that your DEF level is critically low. That means drop whatever you’re doing and refill it. If you continue on ignoring that indication, the consequences could be dire. So, refill the DEF tank as soon as possible.
What happens when you run out of DEF in a Duramax?
Exhaust is injected with DEF before entering the SCR catalyst, where it is then transformed into clean air that exits the tailpipe. If you let the DEF tank run dry, you could experience days, weeks or even months of downtime — along with thousands of dollars in potential repairs.
What does it mean when it says service exhaust fluid system?
Service Exhaust Fluid System (Tamper) – Displays when a Diagnostic Trouble Code (DTC) sets related to the DEF system that is interpreted as tampering with the system. Service Emission System (Not-Tamper) – Displays when a DTC sets related to the DEF system that is interpreted as an Emission Control fault.
How long does a reductant fluid quality test take?
The Reductant Fluid Quality Test (RFQT) may not pass the first test or it may time out (45 minutes for LGH, 70 minutes LML).
What does code P20B9 mean?
Diagnostic trouble code (DTC) P20B9 stands for “Reductant Heater “A” Control Circuit/Open.” This code sets when the reductant heater doesn’t perform as expected. The P20B9 engine code can also be triggered if the powertrain control module (PCM) doesn’t detect voltage in the reductant heater A’s control circuit.
How do you drain a DEF tank?
So, the easiest drain method is to disconnect the fill line at the tank. I had about one gallon left in the tank of DEF when the truck was sayin “Fill DEF soon” (so needle just touching the red on the gauge ). I put 1 gal of tap water in, drove around, then pumped a gallon or so back out.
What does code P249D mean on Duramax, you say? This code indicates that the quantity of DEF delivered to the catalytic reduction system of your Duramax is relatively low. This causes harmful NOx to be left in its raw form. This is neither good for the environment nor the engine.
Where is the NOx sensor located on a 2018 Duramax?
This NOx sensor is located upstream in the downpipe.
How do you clean a NOx sensor?
What causes NOx sensor codes?
As part of the aftertreatment system, the most common reason for a faulty NOx sensor is soot build-up. When the sensor is smothered in soot it gives inaccurate readings, disrupting the ECU and SCR, and causing your truck to throw fault codes.
What does a NOx sensor do?
The NOx sensor is part of the NOx reduction aftertreatment system used in diesel vehicles with urea based SCR systems. The sensor located upstream of the SCR catalyst directly measures the engine-out NOx gas concentration, which helps determine the optimum amount of urea injection.