DEF Pump RPM's too high for the pressure (2024)

FAQs

How do you know if your DEF pump is bad? ›

One of the first signs of DEF presence in engine areas is the Check Engine light turning on. Don't ignore this, as damage may occur and your vehicle could shut down. In addition, a noted increase in the amount of DEF used, or malfunctions in the SCR system may be warning signs that your DEF has been contaminated.

The DEF pump module bladder is recharged with air to 2.8-3.2 bar (40-46 psi) upon installation. The bladder's air pressure needs to be checked every two years.

If low pressure is present, the DEF pump filter may have dried out. To help resolve the issue, allow the DEF pump to sit in DEF fluid overnight in order to re-saturate the filter. The following morning, perform the leak test three additional times. The pump should now be able to build pressure.

You simply run the SCR ADS Self-Check Routine, and you are looking at the following parameters to be within specifications: DEF Pump Speed between 750 RPM and 1800 RPM. DEF Pressure between 900 mbar and 1100 mbar (130 psi to 160 psi)

“Malfunction of DEF Quality Sensors (DEFQS) can cause an engine torque derate through a number of different failure modes, including incorrectly or inappropriately detecting of low fluid quality in the diesel exhaust fluid tank, failure to communicate with the ECM, or being in a failed or offline state,” Thomas noted.

What happens if you inflate your tires to the max PSI? Your tires' max PSI almost always exceeds the recommended pressure. It isn't advisable to fill your tire to this pressure for everyday driving. At max PSI, your car does not handle as well, braking is impaired, and you could risk dangerous blowouts.

Using the supplied 30cc syringe and a new, clean container of DEF, fill the syringe at least half full. Insert the nozzle of the filled syringe into the inlet port on the bottom of the pump. Slowly push the plunger of the syringe to force the clean DEF into the pump until the syringe is empty (refer to Photo 1).

This diagnostic is typically Diesel Exhaust Fluid (DEF) Pump Supply Current High. This code sets when the electrical current to the pump is greater than 900 mA for 10 seconds for 10 consecutive times.

The def fluid pressure sensor is built into the def pump. The def pump will be attached to the rear of the def tank mounting brackets. This is a non serviceable part and can not be replaced without the entire pump assembly being changed.

What is the code for DEF pressure low? ›

There is a pressure sensor that monitors how much pressure the DEF pump produces. It needs to produce 51 PSI within 45 seconds from the time the pump is commanded on. Code P20E8 suggests the pump did not reach that target.

An improperly working DEF injector will cause your truck to display a check engine light or "Reductive Fluid Quality" message on your dash. This can often cause your truck to go into limp mode and give you engine codes.

DEF is consumed at a rate of about 2-3% relative to the amount of fuel you are using. This means between 1.2 and 2.0 gallons of DEF will be required for a vehicle with a 65-gallon gas tank. If you have a five-gallon DEF tank, DEF should be replaced every third or fourth time you fill up.

Overall, Blue Def DEF002–2PK Diesel Exhaust Fluid, 2.5 Gallon, 2 Pack is a reliable and efficient DEF fluid that can help reduce NOx emissions of diesel engines. If you're looking for a high-quality DEF fluid that meets the highest safety and performance standards, this is a great option.

The ideal, or target reading is 32.5%. If under, more DEF con- centration is needed. If over, the urea concentration is too high. In reality, most DEF purchases will consist of premixed containers.

DEF system cleaning will help keep your diesel equipment running smoothly. It is a required maintenance on all diesel industrial equipment. Neglecting to do this can lead to problems in engine performance, fuel injector failures, and it can even damage the DEF system pump.

Increased Fuel Consumption: Not changing a Urea/DEF filter can restrict exhaust flow and increase back pressure, which makes it harder for the engine to breathe and operate efficiently. To avoid these issues, Urea/DEF filters must be replaced on an annual basis or every 120-150,000 miles.

The P20BA code can stem from the failure of certain parts like the reductant heater, reductant temperature sensor, and glow plug control module. The common symptoms of a P20BA code include an illuminated check engine light, no DPF regeneration, and the vehicle entering Reduced Power Mode.