1 d
Paccar def sensor issues?
Follow
11
Paccar def sensor issues?
Also that code won't clear after a regen def only sprays after a regen going down the road. Apr 13, 2014 · 3) air pressure sensor bad. It is most likely that your DPF D. with a Paccar MX-13 engine, you can follow these steps: Check the DEF level using the gauge or dipstick. The battle is heating up between Tesla and its Chinese challenger XPeng as the latter makes clearer its stance on the future of autonomous driving. Don't forget to Like and Subscribe to the Channel! - https://goo. Part Number: Q21-6170-007K1T. The first is 2010 EPA Emissions, which covers model years 2010 through 2012. 3) air pressure sensor bad. The command signal is created by the Cummins ECM. Replaced sensor in tank. 2019 Freightliner tow truck with a 6. They swapped the coolant. Allow 2 minutes for residual coo If a constant, steady is passing through the valve, the valve is stuck open. drained def and swapped def tank sensor from another truck. Fleets should look to improve the life of their DEF/SCR systems by always opting for high-quality DEF fluid from a trusted source “Proper storage of DEF will prevent degradation and reduce the chances of the system detecting an actual DEF quality issue,” Navistar’s Just stressed. Reinstall DEF tank into mounting brackets with existing isolators and fasteners. More power: After deleting the DPF, most owners report a better performing, faster responding engine. 5 psi on def pressure. The fuel injectors work along an optimized delivery fuel feed pump (which pushes diesel via the fuel. Figure :4 DEF Sendin. Description: Def Quality Sensor For Peterbilt Kenworth Paccar Brand: Paccar. Torque nut 20‐23 FT‐LBS 34) 25. Once you have the replacement, power off your device and unplug it from any electrical source. Refer to the WARNING in the General Safety Instructions on page 8. The DEF header must remain in the tank and connected to the DEF and coolant lines DEF level sensor shortage explained#defsensorshortagePlaylist Recommendation: Truck Maintenance - Emission https://bit. drained def and swapped def tank sensor from another truck. Step 3: Check/test the DPF pressure sensor. Description: Def Quality Sensor Condition: New Brand: Paccar Part Number: Q21-6167-001K1T Other Oem P/N: Q21-6170-001K1T, Q21-6127-001K1T, Q216167-001, Q21-6167-001KIT, Q21-6170-001KIT. How to replace your NOx sensor on your Paccar MX engine and save a ton of money by doing so. There are two PACCAR engines. the dealer submitted a case file to engineering and engineering said to check. 5 liter capacity to catch the fuel and measure the quantity. To ensure that you avoid these, make sure you learn the IRS guidelines. It has Active Fault Codes 3868, 4677, 4572. All of these codes say it has an abnormal update rate. Have the DEF fluid and exhaust system inspected by a professional to determine the cause of the issue. Cracks and leaking components of the sensor are common due to the extreme heat on the plastic sensor. By smart I mean it is data-linked to the ECM's that control engine operation and it only has 4 wires going to it. It is responsible for monitoring and controlling various engine functions to ensure optimal performance and efficiency. The intent of the below procedure electrically removes the DEF header sensor from the circuit. This is what we have been able to find out: “PACCAR has been working closely with government agencies to address issues related to the ongoing global shortage of computer chips and the impact that has had on the availability of certain replacement parts. 1605 Def Level and Quality Sensor Problem. In this third Dr Paccar truck repair video I discuss the issue of failed 2016 to 2019 Kenworth DEF Quality sensors. If the DEF level is still low or the gauge readings are still inaccurate after replacing the DEF level sensor, there may be another issue causing the problem. to Table 1 for DEF level sensor resistance1 Connect the ohm meter to the sending unit connector on the pins identified in Table 1. The NOx sensors tells the ECU how much DEF should be injected into the exhaust before it enters the SCR. 1605 Def Level and Quality Sensor Problem. Stories about the lengths people will go to secure a parking spot in the world’s big cities are the stuff of legend. A System Fault refers to a malfunction or failure in the Selective Catalyst Reduction system of a vehicle. Some of the most common Allison transmission codes include 22 for issues with engine and turbine speed sensors, 14 for issues with oil level sensors, and 65 when the engine rating. Also check the DPF pressure sensor tubes for soot build up, this is very common and causes the same issues. The DEF system has a problem. Over time, this can cause severe performance issues and can even lead to the engine shutting down entirely. REPAIR After 2 minutes with the coolant line discon. The DEF sensor simulator tells the engine that all is well with the DEF system. Not a quiet experience. Contaminated SCR box Potential EGR issue. Besides the pump needing voltage and ground, there are three other vital inputs that are involved: Command signal. Speed sensor signal. Nov 13, 2023 · The diesel exhaust fluid (DEF) and the DEF filter are supposed to be changed every 320,000 km. They are also known to be a common sensor to fail and contribute to poor fuel milage and high DEF consumption. we cleared t … Sep 9, 2021 · Marty Makrdichian, a service manager at Peterbilt Truck Parts and Equipment in Sparks, Nev. Although I focus on Paccar power this als. Removal ° The tensioner can be 1. Currently in shop doc says something electrical wont turn on def pump. The DEF system has a problem. Evaluate the NOx sensor after the catalyst. I called our Spartan rep and he said they would upgrade my case to Emergency. When a System Fault occurs, it indicates a problem that requires attention. (head, rods, crank, etc) Running at 1200 rpm is okay for half a load. As a temporary solution, after paccar confirms a def sensor is not available, a temporary software update will allow a vehicle to continue operation with a failed def sensor by disabling the def sensor diagnostics. Description: Def Quality Sensor For Peterbilt Kenworth Paccar, Cleaned Inspected, Comes With New O-Ring Brand: Paccar. Order within the next Jul 14 for delivery by Jul 17. At the ECM level, the PACCAR MX engines can be broken down into two categories. Start the engine and run the test. Feb 7, 2022 · Fleets should look to improve the life of their DEF/SCR systems by always opting for high-quality DEF fluid from a trusted source “Proper storage of DEF will prevent degradation and reduce the chances of the system detecting an actual DEF quality issue,” Navistar’s Just stressed. When replacement parts are needed, we recommend using only genuine parts from PACCAR. Check the DEF fluid for any signs of contamination, such as a change in color or consistency. (01-23-2022, 08:47 PM) Koecon Wrote: Not all CAT engines have an actual quality sensor! They use the Nox sensor signals instead but still can generate that quality code or event. It is made of inexpensive, readily available parts to assist derated users to be able to perform a temporary fix as soon as a DEF sensor failure occurs and safely operate their vehicle until a repair can be obtained. If it is low, add DEF fluid as needed to bring it to the proper level. The ECM will command the doser to open for about 3 minutes. Read and follow all safety instructions. Fix-as-fail due to undersupply issues, only a limited supply of diesel exhaust fluid (def) sensors are available. After the third DEF sensor module failed in probably less than two months. Today, the truck went into limp home mode. Urea (DEF) Tank Heater Valve to determine if the valve is stuck in the open position or otherwise not working properly TIB 43-061: Additional Diagnostics for Failed Urea Quality Sensor Root Cause Page 1. When replacement parts are needed, we recommend using only genuine parts from PACCAR. The DEF gauge dropped to 0, the low fluid indicator came on, the check engine light came on and it threw a couple of codes. Expert Advice On Improving Your Home Videos. P1514 code means there is a malfunction in the throttle control unit for Trailblazer, Chevy, Silverado, and GMC. It is recommended to connect to a diagnostic tool to read the exact pcode, or SPN/FMI. However, though rare, it can have problems from time to time. Contaminated SCR box Potential EGR issue. ferguson faucets bathroom This allows the engine exceptional power in a smaller footprint to move more cargo as compared to its weight. Contaminated SCR box Potential EGR issue. There are several common causes for a speedometer to stop working. Currently Recommended DEF Sensor Simulator Build Option: CanBed RP2040 - This solution has a Raspberry Pi processor as well as the CAN interface integrated on a single board. The Paccar PX-9 engine has its fair share of problems. One of the most frequent problems with the Paccar MX 13 Regen is incomplete regeneration cycles. The bypass is only available to vehicle owners after the DEF sensor fault light indicator signals the first of three warnings before the engine is shutdown. I usually regen until temps hit 1000 and stop the regen and road test for about 30 minutes and it clears if the problem is. A pox on your cursed MaxxForce engines! 2021 Multiplex Electrical System - peterbilt vecu To diagnose and fix DEF contamination in your Peterbilt 386, 389, 567, 579 etc. Shop thousands of OEM truck parts to our cost friendly line of aftermarket parts. to Table 1 for DEF level sensor resistance1 Connect the ohm meter to the sending unit connector on the pins identified in Table 1. 1605 Def Level and Quality Sensor Problem. Over the weekend, XPeng, which c. The improved NOx testing in DAVIE4 includes: Evaluate the NOx sensor before the catalyst. The def quality sensor and def level sensor is all one piece so I knew it had failed. The software bypass is a temporary fix until new sensors are made available. Every permanent fix I’ve seen on a post 2015 MX13 has been nothing but a hack job with blocked off egr and stuff because nobody makes aftermarket parts like what’s available for the pre 2015 models. Could be many things, most common would be a clogged DEF doser. infowarsstore We wrote early this month that Cummins, the EPA, and other industry types had announced they would allow a software patch. The DEF system has a problem. With the use of sophisticated computer systems and sensors, vehicles are now equipped with. In this comprehensive guide, we will decode the world of Paccar MX 13 fault codes, helping you keep your engine in peak condition Sensor, DEF temperature / level (F851) - Temperature signal unlikely, too high: The DEF pump is tied into the same wire. The gauge shows the truck is full and I also topped off the DEF fluid hoping that that would solve the problem but I have not had any luck. The Paccar PX-9 weighs 1,695 pounds. Refer to the WARNING in the General Safety Instructions on page 8. Every permanent fix I’ve seen on a post 2015 MX13 has been nothing but a hack job with blocked off egr and stuff because nobody makes aftermarket parts like what’s available for the pre 2015 models. the dealer submitted a case file to engineering and engineering said to check. Availability: In Stock00. Paccar mx13 reads -14. There could be an issue here or with the wiring in the harness that you didn't replace. codes for tank level, temp and quality all popped on at once. diagnostic adapter (Nexiq USB Link 1, 2 or 3) laptop with Windows 7, 8, 10 or 11 operating system. Also that code won't clear after a regen def only sprays after a regen going down the road. From noisy operations t. Smooth shifting and a reliable transmission are vital for a comfortable ride. and Sof tware Emissions Recall E285 En g i n e - 4 5 EPA 2 0 2 1 PAC C A R M X Pa r c u l ate M ae r S e n s o r a n d S o wa re Em i s s i o n s Re ca l l 1-877-795-0656 or support@advancedtruckparts Description. ***** with same def level sensor problem Q21-6170-002k1t not available. cheap last minute bus tickets The tool helps address issues related to the DEF (Diesel Exhaust Fluid) level sensor and associated fault codes. The DEF level sensor can also be a cause of inaccurate or erratic DEF level gauge readings. Sometimes, Boone noted, the problem is with other components of the engine, but still results in the need to replace the ATS. is there a connector or module i should check out or is it likely in the tank itself? Parts are available from PACCAR Parts Inspect the coolant level sensor harness for damage where it is retained by a cable tie to a tab on the surge tank. Def sensor? There's isn't a def sensor. I have SCR system issues, Engine stop, max derate. 5 liter capacity to catch the fuel and measure the quantity. we cleared t … Sep 9, 2021 · Marty Makrdichian, a service manager at Peterbilt Truck Parts and Equipment in Sparks, Nev. The DEF level sensor can also be a cause of inaccurate or erratic DEF level gauge readings. They are smart sensors reporting on the DL7 (J1939-7) data link a. SCR / DPF / DEF Emulator For Paccar MX GHG17 and GHG14. DEF gauge erratic, bouncing from half tank to empty, threatening derate.
Post Opinion
Like
What Girls & Guys Said
Opinion
70Opinion
But if those aren't working out for you, this posture sensor that detects when your posture slips an. This can happen if a driver does not allow the process to complete, resulting in soot build-up in the Diesel Particulate Filter (DPF). Description SCR / DPF / DEF Emulator For Paccar MX GHG17. According to a new report, Southwest is making changes to a sensor believed to have played a role in the Lion Air crash on some of its Boeing 737 MAX planes. These sensors are required on heavy-duty diesel vehicles to ensure that the emissions controls needed to meet clean air standards are in place and working. Ask Your Own Medium and Heavy Trucks Question. The PX engines are rebranded Cummins engines, and this blog post will focus on the PACCAR MX engines. and can't do forced regen. I have kw t680 2015 paccar auto transmission. The fuel injectors work along an optimized delivery fuel feed pump (which pushes diesel via the fuel. Other Oem Part Numbers That Will Work: Q21-6170-003k1t, Q216167003k1t, Q21 6167 003k1t, Q216170003k1t. If performed at a Peterbilt or Kenworth dealer, the dealer must have followed PACCAR TIB 43-071 and received approval from PACCAR to proceed with the TRP. We have figured out the coolant line coming into the QLS sensor is the keep the DEF from freezing in the northern states. If it is low, add DEF fluid as needed to bring it to the proper level. captain dodd garland county fired A pox on your cursed MaxxForce engines! 2021 Multiplex Electrical System - peterbilt vecu To diagnose and fix DEF contamination in your Peterbilt 386, 389, 567, 579 etc. WHAT IS IT: DEF Quality Sensor Brand New Genuine Paccar Kenworth Q21-6170-007K1T Assembly Gen 2 *NOTICE - This sensor is the new 4 PIN connector and NOT the old 3 pin style. 4) def pump pneumatic switching valve, bad. Here is a case study I have using scan Data and some basic Circuit Checks with a Dvom. Reconnect DEF lines and coolant hoses to the head unit Remove pinch off type hose clamps Plug in the two wire harnesses and secure By doing so, you can get the problem addressed appropriately and get the result you want. Get home with these steps even if your truck is def derated. The first is 2010 EPA Emissions, which covers model years 2010 through 2012. Q21-6127-006K1T Genuine Paccar Def Quality Sensor is backordered and will ship as soon as it is back in stock Please don't hesitate to reach out to us if you encounter any issues or. Asymptomatic means there are no symptoms. connect the fuel line and leave the electric plug connected. I called our Spartan rep and he said they would upgrade my case to Emergency. There is one right after the exhaust manifold and the second after the selective. Ok that definitely helps5psi def pressure is a preset reading when there is a wiring issue The pressure really shouldn't be much less or more than + or - 2 psi when the pump isn't working. 5 liter capacity to catch the fuel and measure the quantity. Check the DEF level using the gauge or dipstick. 22422785 GENUINE VOLVO BOOST PRESSURE TEMPERATURE SENSOR OEM - NEW76. These alerts can help you avoid injury to yourself, your passengers and help prevent costly damage to the vehicle. Heres the run down: So I was dropping off and I turned off the truck for about 90mins, then I was about to leave and i turned it on and the dashboard lights were on---check engine light, and the check engine light with the wrench on it. used cargo trailers under dollar1500 I have a 2016 Peterbilt with a paccar mx13 270,000 miles. Read and follow all safety instructions. You need some kind of container of at least 0. These codes state basically that it has issues with the Diesel Exhaust Fluid Quality, Temperature, and level. The knock sensor is a crucial component in your engine that helps prevent damage caused by detonation or knocking. I replaced the dosser valve and outlet nox sensor and the codes did not go away. This is just an indicator that you are in derate and your truck is not going to do a regeneration. Diesel exhaust fluid (DEF) is a non-hazardous solution used within a selective catalytic reduction (SCR) system to break down harmful pollutants (NOx) generated by a diesel engine5% urea, or aqueous ammonia solution, and 67 The fluid is sprayed and then spread into the exhaust gas via a mixer before entering the. Inspect the sensor for any signs of damage or debris. Sep 22, 2021 · September 22, 2021. This video will help solve your DPF Full Engine Derate if you do a full regeneration then it asks for another regeneration. d they measure the INLET (Pre SCR) and OUTLET (Post SCR) of NOx PACCAR sells the PACCAR MX and the PACCAR PX engines. A System Fault refers to a malfunction or failure in the Selective Catalyst Reduction system of a vehicle. ark imprinting bonus Plus my truck keeps de rating after 30mins into driving and 2nd engine light is on help. Also check the DPF pressure sensor tubes for soot build up, this is very common and causes the same issues. Parts are available from PACCAR Parts Inspect the coolant level sensor harness for damage where it is retained by a cable tie to a tab on the surge tank. If the DEF level sensor or wiring is not functioning properly, it may not accurately detect the DEF fluid level and the vehicle's. Your commercial truck can carry out either passive DPF regens or active regens. MX also uses a Cummins Turbo, if it sucks blame Cummins but we already knew that thanks to the ISX's love for turbos ;) The MX has had issues, 2013+ are better. Diesel exhaust fluid (DEF) is a non-hazardous solution used within a selective catalytic reduction (SCR) system to break down harmful pollutants (NOx) generated by a diesel engine5% urea, or aqueous ammonia solution, and 67 The fluid is sprayed and then spread into the exhaust gas via a mixer before entering the. And we can not figure where it gets it def quality issue or where the sensor is at it's not in the tank per kw parts. New def sensor, nox sensor, ran a full regen and it’s at normal for soot but still won’t clear. On EPA10 motors, the sensing tube to exhaust gas pressure sensor before turbine tends to plug. Most important features: Emulation of whole SCR / DPF system. Paccar Def Quality P/N: Q21-6127-006k1t The Same As Q21-6170-003k1t, Q21-6170-003k1t, Q216167003k1t, Q21 6167 003k1t, Q216170003k1t, Q21 6170 003k1t. The sensor is linked to the on-board computer, which adjusts the fuel mixture and eng. This tray fits fairly tightly but could be attached to the board with small screws or double sided tape. Paccar runs coolant through the tank to warm the DEF in a defrost cycle Please see your local Kenworth dealer for support related to DEF Sensor issues and parts availability PACCAR MX-11 & MX-13 ENGINE Marty Makrdichian, a service manager at Peterbilt Truck Parts and Equipment in Sparks, Nev. The DPF will trap soot from the engine exhaust gases. Pete 567 with Cummings X15 motor.
The ecm shut the truck down thinking it's out but the tank is full The part is on back order with no known delivery date! Paccar Mx 13 dpf issues. connect the fuel line and leave the electric plug connected. The other is 2013 EPA Emissions, which covers 2013 through current SPN 411 = P1495 / P1496. I have a 2015 kw t680 paccar mx 13. Part number: Q21-6167-001K1T, Brand: PACCAR Price: $250. secondhandcoke reddit 5 liter capacity to catch the fuel and measure the quantity. Inspect the sensor for any signs of damage or debris. NOX sensors can be faulty, as well a several other things 2018 m2 106 freightliner changed nox sensor now my DEF light won't go off. Proper PACCAR authorization number must be obtained, reference the TRP for further instructions. TRP2490 - qualified. A clogged fuel filter can cause several problems in the Paccar MX13 engine, including rough idling and stalling, stuttering, jerking, and a loss of power. 24 hour home depot There are two PACCAR engines. REPAIR After 2 minutes with the coolant line discon. The level sender has failed so the ecm thinks that the truck is out of DEF. It is most likely that your DPF D. If there’s a faulty injector or a turbo fails, for example, those failures can lead to issues in the ATS. Communication Number: E191, Date: 2018-08-07 Category: 060000 ENGINE (PWS) Summary: Non-Safety Campaign: PACCAR MX-13 Model Year 2017 engine may have a failed engine brake spring capsule. hy vee workday login 1 cubic-foot microwave, both the largest in their class. Other Oem Part Numbers That Will Work: Q216170002, Q216170002k1t, Q21 6170 002k1t, Q21-6170. This number is a direct I was making good time down I-20 yesterday morning when a glance at my gauges showed the red light on the DEF tank. Expert Advice On Improving Your Home Videos Latest. It checks quality by when it doses. I found a huge build up of crystallized DEF (diesel exhaust fluid) in my exhaust pipe less then 6 weeks after I had the valve replaced and pipe cleaned. They are also known to be a common sensor to fail and contribute to poor fuel milage and high DEF consumption.
They are also known to be a common sensor to fail and contribute to poor fuel milage and high DEF consumption. If you cant figure the. Typically, these malfunctions are caused by an issue with a car’s wiring, a broken gear in the speedometer system. One of the most frequent problems with the Paccar MX 13 Regen is incomplete regeneration cycles. The fuel injectors work along an optimized delivery fuel feed pump (which pushes diesel via the fuel. Determined problem was an outlet NOx sensor and replaced it. Refill the cooling system. The Paccar PX-9 weighs 1,695 pounds. The Paccar MX13 turbo engine is a powerful engine that will provide excellent performance for your truck. Regardless of when you do it. P1514 code means there is a malfunction in the throttle control unit for Trailblazer, Chevy, Silverado, and GMC. As a temporary solution, after paccar confirms a def sensor is not available, a temporary software update will allow a vehicle to continue operation with a failed def sensor by disabling the def sensor diagnostics. I know a lot of people have them cause they are a little cheap. We've shown you a couple of ways to fix your posture and why it's so important. You need some kind of container of at least 0. This vehicle has an exhaust Aftertreatment System (ATS), to control vehicle exhaust emissions. To clean you can just blow the tubes. 7 %âãÏÓ 1008 0 obj > endobj 1034 0 obj >/Filter/FlateDecode/ID[5794E865CED2B64F9CBDD639DE2EF59D>424E1B313EE038458D31164A652741D1>]/Index[1008 50]/Info 1007. Replace any worn or damaged seals or gaskets Check the fuel pressure and inspect the fuel filter. NOTE: PACCAR Body Controller faults on the KWP2000 protocol can only be read when using the Noregon DLA+ 30 Wireless, DLA+ 20 Wireless, DLA+, or DLA+ Wireless adapter. drift boss unblocked 66 Jan 22, 2021 · Def sensor? There's isn't a def sensor. One of the most frequent problems with the Paccar MX 13 Regen is incomplete regeneration cycles. The DEF System Simulator (DSS) is a hardware/software solution that a user can build. Still, DEF tanks can be contaminated, and that can cause problems with the DEF quality and ultimately NOx conversion. If see fault codes are present, associated FCAPs. It is most likely that your DPF D. The NOx sensors tells the ECU how much DEF should be injected into the exhaust before it enters the SCR. Reconnect DEF lines and coolant hoses to the head unit Remove pinch off type hose clamps Plug in the two wire harnesses and secure By doing so, you can get the problem addressed appropriately and get the result you want. One part, in particular, the Urea Quality Sensor (UQS. codes. If it is low, add DEF fluid as needed to bring it to the proper level. Fix-As-Fail - Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are As a temporary solution, after PACCAR confirms a DEF sensor is not available, a temporary software. Unit LineWith stream the line disconnected, only residual coolant should exit the line. Manufacturer information Headquartered in Bellevue, WA, PACCAR® is a Fortune 500 company specializing in heavy duty commercial vehicles. Parts are available from PACCAR Parts Inspect the coolant level sensor harness for damage where it is retained by a cable tie to a tab on the surge tank. These sensors are required on heavy-duty diesel vehicles to ensure that the emissions controls needed to meet clean air standards are in place and working. The most common form is passive regeneration. The Simulator has only been tested and shown to work on a handful of Cummins engines using Cummins CM2350 ECMs. This allows the sensor to talk in real-time to the engine ECM and. In general P1514 trouble code is about a car engine receiving more air with respect to the known throttle position. Pete 567 with Cummings X15 motor. The Paccar PX-9 weighs 1,695 pounds. Thanks International. tractor supply propane tanks Cracks and leaking components of the sensor are common due to the extreme heat on the plastic sensor. The engine has a high power output with a corresponding fuel efficiency that significantly reduces operational costs to the owner. 4. It isn't a hard job (this is the front or inlet NOx Sensor) Step 3: Check/test the DPF pressure sensor. d they measure the INLET (Pre SCR) and OUTLET (Post SCR) of NOx 1) When looking at the descriptions of the codes in QuickServe, for the DEF faults, it mentions that a faulty ambient air temp sensor is a possible reason those codes would become active, and with that, would disable the DEF system. Used Paccar DEF Sensor out of 2020 Truck, PN Q21-6127-002 Located in Palmyra, PA, US. Polestar introduced the Polestar 4, the. The inlet sensor tells the ECU how much DEF to inject into the pre-SCR exhaust, and the outlet NOx sensor measures NOx levels in the post-SCR exhaust to measure its performance What Problems Can My Paccar NOx Sensor (2236409) Experience? Nitrogen oxide sensors have to be highly sensitive to pick up on fluctuations in NOx levels, but the. It is most likely that your DPF D. Also unplug the Turbo actuator connections and recheck. As a result, the engine computer won’t take that nasty de-rate action. Inspect the sensor for any signs of damage or debris. drained def and swapped def tank sensor from another truck. Paccar DEF Quality Sensor Bypass. Reconnect DEF lines and coolant hoses to the head unit Remove pinch off type hose clamps Plug in the two wire harnesses and secure By doing so, you can get the problem addressed appropriately and get the result you want. We have figured out the coolant line coming into the QLS sensor is the keep the DEF from freezing in the northern states. The software fixes allow engines to operate normally but still require carriers to keep their DEF tanks full, said Marty Makrdichian, service manager at Peterbilt Truck Parts and Equipment in. I have SCR system issues, Engine stop, max derate. GM, KENWORTH T680, REPLACE ENGINE 2020 PACCAR MX13 TO A 2023 PACCAR MX13, WHEN ENGINE IS COLD ENGINE IS STABLE, WHEN IT STARTS WARMING UP Cummins ISX engine … read more DEF Fluid - The tank with the blue cap holds DEF Fluid.