How to clear engine derate paccar

Without identifying and addressing the issue that caused the derate to begin with, you most likely won’t just be able to get out of derate. With that being said, you might be in derate due to a mistake like; your DEF ran out or forgetting to put the ACM supply cable onto the positive terminal of the battery after replacing a battery and ...

The calibration upgrade will clear the fault code and the ineffective regeneration count locking the turbo to 50%. 3. Clean the aftertreatment injector as indicated in Cummins® procedure 011-042. 4. Perform a flow and leak test on the aftertreatment injector as per Cummins® procedure 011-054. 5. Perform a stationary regen.Feb 9, 2020 · PACCAR MX11 EPA 17 RESET DERATE. Let me start off with this community has been a game changer for the business that I currently manage fleet operations for. Thank you to all for your contributions to this site! I have a few PACCAR engines, 6 PX9's, 1 MX11, and 3 MX13's. To diagnose and fix DEF contamination in a Freightliner Cascadia with a Detroit DD15 engine, you can follow these steps: Check the DEF level using the gauge or dipstick. If it is low, add DEF fluid as needed to bring it to the proper level. Check the DEF fluid for any signs of contamination, such as a change in color or consistency.Jul 31, 2022 · If your DPF is full this a very detailed video of removing your DPF and cleaning it as well. Best way to save a lot of money and down time. I Genuinely hope ... Moto3 is the lightest and most affordable level of Grand Prix motorcycle racing, but just how much do Moto3 riders earn? We explore salaries, race winnings and endorsements to uncover the true financial rewards of competing in Moto3.Mar 4, 2019 · For the vehicle owner each violation is $3,750, being 2 violations, one violation for removing the DPF and second for reprogramming the computer to delete the DPF. But for the shops/techs that do the delete the fine is $37,500 per violation and for DPF delete that again would be x 2. So yeah, the EPA has put a heavy fine on the shop/tech that ... SPN: 1569 / FMI: 11/31. Cummins Fault codes 3712 and 3714. If these fault codes are active, this means the engine performance is already reduced (power derate) and possibly the vehicle speed is also limited. Both are information-only fault codes which appear when the ECM detects active critical fault codes related to engine operation.The Google Search Engine - The Google search engine remains the cornerstone of just about everything the company does. Helping users find what they want on the internet is paramount. Advertisement As large as Google has grown, as many chang...

Nov 1, 2021 · There are multiple levels of engine power derates, known as inducements, that are enforced when a fault condition exists. For a Urea Quality Sensor (UQS) fault, the steps are: warning, torque derate 1, torque derate 2, then severe derate. The first step, warning, will turn on a check engine light and/or a MIL light. Torque derate 1 reduces ... Found my decomp pipe was incorrectly installed and cleaned the massive crystal buildup out then reinstalled it. Also did a full test on the aftertreatment harness and engine harness. No issues found. They then did 2 50 mile road tests amd a regen found everything in spec. Got 200 miles and boom max derate towed in yet again.This happens to me before on a worst timing possible. I was 1 hour away to S&R and my engine is going to derate in 3 hours. Also, the facility has a strict no idling rules, so I have to turn off my truck when being loaded. When I'm done & turn it back up, the derate disappeared. I realized that it's just a glitch in the system.Your car will activate this feature when it detects abnormal readings from sensors, or improper mechanical part operations. Limp mode is also known as “limp home mode”, and is designed to protect your engine and transmission from catastrophic failure. Most diesel vehicles have a similar mode referred to as “ engine derate “.Sep 14, 2015 · Thanks for the tips people. Problem resolved. I found a broken power wire in the ACM harness about 2ft in front of the battery box on the inside of the frame rail. I'm surprised the fuse didn't blow as it was the positive rubbed through on a cross member. Repaired wire no longer in derate. I still had to clear the engine light with VCADS PRO. Issue: Some 2017-2019 F-Super Duty vehicles equipped with a 6.7L engine built on or before 9-Jan-2019 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P2074, P0401, P0402 and/or P0170. This may be due to various strategies within the powertrain control module (PCM) software.Oct 22, 2020 · This is an explanation on what it takes to clear fault codes 3712 and 3714 on Cummins powertrains. Our technical support services have successfully helped ma...

Joined: Jul 2011. 1 03-10-2019, 05:31 AM. my friend please help with these problem on detriot diesel DD13 engine..... (1)Regulatory fault ignored-Final action (speed limit) code 5246. (2)Regulatory fault ignored -derate on code 5246. (3)Regulatory fault ignored -final action pending code 5246. (4) DEF metering unit -Exceeded unclog attempts ...Feb 26, 2020 · 2018 Peterbilt 579 with MX13 Paccar Engine- Engine in Derate mode with fault codes P1515 & P006B. Another mechanic put a new EGR Valve on it because that's the diagnosis they came up with. Truck ran a … That happened to me in a Crapcadia. I filled the DEF at the TA in Wheat Ridge and made it to Vail before the light came on and the engine derated to 55. I drove a bit further and made it to Rifle without the engine derating further and parked it because I wasn't looking forward to driving at 5 MPH on those narrow shoulders on I-70.Jun 21, 2021 · in this video I will show you how to clear a specific derate code. Keep in mind that not all codes can be cleared from the side of the road. For many you wil... E1389 – Aftertreatment #1 SCR Operator Inducement. This code is an inducement associated with an emissions system fault. The engine is derated, limited to low idle, and can experience 5 minute rolling shutdowns. Probable Causes – Codes in the “Selective Catalyst Reduction System” ECM. An E1389 or 5246 code will come active with another ... Paccar Diagnostic Scanner. The diagnostic scanner for your Paccar engine enables you to perform forced DPF regeneration and so many advanced full system diagnostics, such as read and erase the fault codes, injector coding, NOx reset, DEF reset and derate, actuation tests and so much more we cannot list it all.

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Paccar EGR delete. EGR returns Your exhaust to intake, for additional combustion. That causes filling intake & turbo with soot. Turbo gets sticky, and it doesn't move as fast & free as it did when it was clean. All that has negative contribution to Your engine performance & reliability. With Paccar EGR delete tuning, Your EGR valve & sensors ...GMC vehicles are produced by General Motors. GMC specializes in sport utility vehicles, trucks and vans. If your GMC vehicle sets off a fault code, also known as a check-engine code, resetting the code after the repair has been made is a si...If the “Clear All Faults” command was used to clear all faults in the ECM, use recommended Cummins® electronic service tool or equivalent to calibrate the ECM with the latest calibration from QuickServe® Online or the April 2013 INCAL Calibration DVD or newer. Once the ECM has the new software, all fault codes will be cleared.Found my decomp pipe was incorrectly installed and cleaned the massive crystal buildup out then reinstalled it. Also did a full test on the aftertreatment harness and engine harness. No issues found. They then did 2 50 mile road tests amd a regen found everything in spec. Got 200 miles and boom max derate towed in yet again.

They Can Disable the Derate temporarily, and during a road test The Derate Will Clear by itself as long as everything was fixed, some variations off paccar engines will clear a …PACCAR Davie4 is the software used by dealerships and large fleets across North America. This is the same software as used by dealerships, which allows you to perform dealer level diagnostic commands such as: DPF Regenerations. Injector/Cylinder tests. DPF & SCR Derate Disable. Download log files into PDF or Excel.STEP 3: Clean all your aftertreatment components. This includes all the components that have been contaminated by the oil, fuel, and coolant. Clean exhaust system piping after the turbocharger to the inlet of the DOC filter. Clean all temperature sensors and pressure sensors (use electrical cleaner).Poor def quality warning cameo on after filling def in a kenworth t680 that has a paccar engine. It is a 2016 and we - Answered by a verified Technician ... If your truck goes into derate, it's a matter of time before shutdown. I k ow this probably isn't the news you wanted to hear but it may keep you from breaking down on the highway and ...SPN 5246 FMI 0 Cummins. This code is letting you know the final issue that will be implemented. The code is called the Regulatory Fault Ignored - Final Action (speed Limit). What that means is that your engine will be derated to 5 mph and no higher. You can try to drive above the 5 mph restriction but you run the risk of damaging other ... For the vehicle owner each violation is $3,750, being 2 violations, one violation for removing the DPF and second for reprogramming the computer to delete the DPF. But for the shops/techs that do the delete the fine is $37,500 per violation and for DPF delete that again would be x 2. So yeah, the EPA has put a heavy fine on the shop/tech that ...This happens to me before on a worst timing possible. I was 1 hour away to S&R and my engine is going to derate in 3 hours. Also, the facility has a strict no idling rules, so I have to turn off my truck when being loaded. When I'm done & turn it back up, the derate disappeared. I realized that it's just a glitch in the system.To get your equipment back up and running you will need to: Repair and clear the other fault code (s) that are causing the derate code to display. Once you have fixed the underlying problem (s) you will be able to successfully clear the derate code. This will allow you to start the engine at full power. Attempting to clear the derate code ...Jul 28, 2017 · How to BYPASS DEF Derate on Paccar MX. DieselBullet. 14.4K subscribers. 68K views 6 years ago. Get home with these steps even if your truck is def derated. If this helped you get home, let me... Jan 31, 2019 · I have a 2015 peterbilt 579 with a paccar mx13 engine and truck came in with code p1496 for egr disconnected and p1515 for egr operation fail and p1518 … read more. I have peterbilt with Paccar mx13 2013 with following codes p1517.1518.p151A.p0219 I did force Regen but theme codes still … read more. Hello. The 3712, 6255 and 6254 are all derate faults due to the check engine light. They should all have gone inactive within a few minutes of a regen even with an active 286. But maybe the reason they are not going inactive is because the 286 fault is for the regen permit switch.The parameter settings under "J1939 multiplexing" in the Features ...Lucky for you, OTR has a 5 MPH DEF derate tool for reset. The OTR reset tool for Paccar will reset the 5MPH derate at the dealer level, and it will give you the capability to perform these resets yourself for a significantly lower cost. Now let’s see what the benefits for you are: The OTR’s reset tool will completely clear the fault codes ...

SPN: 1569 / FMI: 11/31. Cummins Fault codes 3712 and 3714. If these fault codes are active, this means the engine performance is already reduced (power derate) and possibly the vehicle speed is also limited. Both are information-only fault codes which appear when the ECM detects active critical fault codes related to engine operation.

Benefits with DPF Delete. There are three key benefits associated with DPF delete: more engine power, better fuel economy, and reduced maintenance costs. More power: After deleting the DPF, most owners report a better performing, faster responding engine. Better fuel economy: Fuel economy is a big winner after deleting the DPF.To clear engine derate caused by a clogged air filter, start by locating the air filter housing. Remove the housing and examine the filter. If it is dirty or clogged, it …2017 Peterbilt 348. PX9 engineGetting off and on codes. Hello and welcome to Just Answer, The engine was in a derate and the fault that is causing it is the fuel pressure relive valve failing and allowing excess fuel pressure in the system. The valve needs to be replaced to correct the fuel pressure issue. Then let the engine idle for 5 min and ...Just for future reference, The one with a wrench is a check engine light. The one without a wrench is the malfunction indicator lamp. The MIL indicates an emissions-related fault code (EPA requires certain failures of parts to illuminate an MIL). The CEL is everything else. It's rare on modern tractors that you'll have one light without the other.Then click on the tab again, I can't remember off the top of my head what the tab says now. This will update the PCI and also update the EAS. Now run the engine for a few minutes if the P1514 is still present. If it's still active you can try to clear it manually. If it's still active after that, go to "disable the SCR derate."The PACCAR adapter changes the communication from CAN3 to CAN1 and routes the right communication information to the diagnostic scan tool. If you don’t have this adapter you will NOT be able to perform any of the commands such as reset fault codes, reset EGR derate, reset 5mph derate or force a DPF regen. Hey truckers! Tip Wednesday video today....tune in to learn a simple way to reset the codes on your semi truck without a computer. This video was brought to ...Turn ignition on , lightning bolt and check engine light and def quality derate on lcd all on. after about 5 seconds lightning bolt goes off, a couple seconds later the check engine light goes off. Again I clear the derate message with the guard dog. No codes. PROCEDURE Follow the troubleshooting attachment for enhanced diagnosis of the SCR …

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Aug 17, 2018 · by OTR Performance. Product: https://otrperformance.com/products/otr-reset-tool-paccar-mxThe OTR Reset Tool provides you the capability to get back on the road in less than 5 mi... Jul 28, 2017 · How to BYPASS DEF Derate on Paccar MX. DieselBullet. 14.4K subscribers. 68K views 6 years ago. Get home with these steps even if your truck is def derated. If this helped you get home, let me... Always refer to engine service manual for the latest information related to engine diagnostics and troubleshooting. Contact your local Cummins dealer for more information. Fault Severity Level Fault Severity Function Action To Be Taken By Operator 1 Stop Stop Engine Now – Damage Imminent 2 Warning Warning – Engine May Continue to Run,Engine derate is cut in power and/or torque on the engine. You may not notice it when empty and on flat ground, but you will definitely notice it when pulling hills while loaded. The derate can be as little as 25% to as much as 90%. Then you have limp mode where the truck will cut speed back. First is to 50 mph then second is to 5 mph.Paccar EGR delete. EGR returns Your exhaust to intake, for additional combustion. That causes filling intake & turbo with soot. Turbo gets sticky, and it doesn't move as fast & free as it did when it was clean. All that has negative contribution to Your engine performance & reliability. With Paccar EGR delete tuning, Your EGR valve & sensors ...How to BYPASS DEF Derate on Paccar MX. DieselBullet. 14.4K subscribers. 68K views 6 years ago. Get home with these steps even if your truck is def derated. If this helped …The derate is due to the nox sensor f/c. Any aftertreatmemt related f/c will cause a derate in these engines. That fault is an information only fault code and will clear as soon as the 3232 goes inactive. I mistook this f/c at first glance for another one and gave out some inaccurate advice.Check the engine oil level and pressure: If the engine derates is caused by low oil pressure. Then check the oil level and pressure will be your first step. If the oil level is low, top it up with the recommended oil for your vehicle. And if the oil pressure is still low. Then you may need to replace the oil pump or repair the oil pressure sensor.I would have it plugged into the dealer software and check for the most recent updates and the parametr settings. PACCAR PX-6 and PX-8 Engines. and Cummins ISL Engine: Regardless if the DPF lamp is. on or off, the engine speed will. automatically increase to 1000. to 1100 RPM and remain at this. speed for 10 minutes.We will disable the derate, clear the codes, regen, and road test to try to get a code to set. Ask Your Own Medium and Heavy Trucks Question. Customer reply replied 12 months ago. Yep. ... 2018 Peterbilt 579 with MX13 Paccar Engine- Engine in Derate mode with fault codes P1515 & P006B.When pulling an S10 engine, the proper equipment should be used with caution. The engine is heavy and will need to be lifted approximately 5 feet high to clear the radiator support. This makes moving the engine by the lift difficult at best... ….

The derate is due to the nox sensor f/c. Any aftertreatmemt related f/c will cause a derate in these engines. That fault is an information only fault code and will clear as soon as the 3232 goes inactive. I mistook this f/c at first glance for another one and gave out some inaccurate advice.MX 13 EPA 13 Emission control system - Engine torque derate active P1518 FMI N/A Count 49. From what I've found so far P1496, P1515 and P1518 are triggered by some other codes and latch after 10 hours. I don't have DAVIE to reset them. I can't find anything on SPN 5246 though.Nov 30, 2022 · Wrap Up. A Peterbilt derate happens because of numerous reasons. It could be due to the emissions system, or the DPF and SCR catalyst efficiency errors. When these problems arise, an engine derate occurs. For issues linked with emissions, the vehicle is likely to get into a 5 PMH derate enabled by your ECU. In this tutorial video, we'll show you how to access the EGR and SCR/DEF derate disable features on a Paccar MX engine using the Jaltest diagnostic tool. The Jaltest is a comprehensive...... diagnostic, clear code, dpf reset, aftermarket reset, derate clear - OTR performance diagnostic tool for Cummins, Detroit, Paccar, Volvo engines. #semi #engine ...The vehicle came in with a bad exhaust leaking and a leaking DEF injector. repaired the exhaust leak and replaced the DEF injector. I have the PACCAR davie software. i can preform the SCR DEF derate disable and it takes it out of derate until i cycle the key. then these codes come right back. ive updated the PCI and after treatment modules. ive tried …The vehicle came in with a bad exhaust leaking and a leaking DEF injector. repaired the exhaust leak and replaced the DEF injector. I have the PACCAR davie software. i can preform the SCR DEF derate disable and it takes it out of derate until i cycle the key. then these codes come right back. ive updated the PCI and after treatment modules. ive tried …MX-13 codes. Working a T680 with a MX-13 and its got me scratching my head. The only codes it has are P1514 DEF dosing malfunction and P1518 engine torque derate and none of the corresponding codes to cause the derate in the first place. I have run def pump tests and flow tests and that all checked out, I have run parked regens and watched all ... How to clear engine derate paccar, Benefits with DPF Delete. There are three key benefits associated with DPF delete: more engine power, better fuel economy, and reduced maintenance costs. More power: After deleting the DPF, most owners report a better performing, faster responding engine. Better fuel economy: Fuel economy is a big winner after deleting the DPF., 2018 Peterbilt 579 with MX13 Paccar Engine- Engine in Derate mode with fault codes P1515 & P006B. Another mechanic put a new EGR Valve on it because that's the diagnosis they came up with. Truck ran a day & went back into derate & those 2 faults are active again. I have the troubleshooting process for the P006B but not finding guide …, If The Repair has been made it most likely needs to go to the dealer. They Can Disable the Derate temporarily, and during a road test The Derate Will Clear by itself as long as everything was fixed, some variations off paccar engines will clear a derate with a forced regen alone, however most need a road test., There are three key benefits associated with DPF delete: more engine power, better fuel economy, and reduced maintenance costs. More power: After deleting the DPF, most owners report a better performing, faster responding engine. Better fuel economy: Fuel economy is a big winner after deleting the DPF. Not only will a vehicle conserve the fuel ..., When their is a problem with the DEF system or sensors. That what happens. Fist your DEF light will flash. Then check engine light comes on. If driver keep driving or does not notice. I think the system is set let truck go 500 miles. If not fixed then the red engine light comes on and truck will limit speed to 5MPH., To clear engine derate caused by a clogged air filter, start by locating the air filter housing. Remove the housing and examine the filter. If it is dirty or clogged, it …, Hey Mustafa depending on the fault code and the derate, our tool can not help either most 3rd party tools can reset fault codes/ derates, but some require a specific test to reset that fault/derate only after a repair has been made to the truck that ca… , GMC vehicles are produced by General Motors. GMC specializes in sport utility vehicles, trucks and vans. If your GMC vehicle sets off a fault code, also known as a check-engine code, resetting the code after the repair has been made is a si..., Paccar has a service interval for the DEF filter and dosing unit at 300,000 miles. Still, DEF tanks can be contaminated, and that can cause problems with the DEF quality and ultimately NOx conversion., Jun 23, 2020 · You clear codes and first trip out it goes back into limp cause you nox output is lower stationary and def system can handle the load better. It’s worth a try but make sure to test drive before calling it fixed. (06-23-2020, 03:16 AM)Rjpierma24 Wrote: have a 2016 freightliner DD15. Has codes 4364,3364,5246. , Ah. Ok. Got this info out of the 2016 t680 body builders manual: "Only an OBD compliant battery disconnect switch may be installed on vehicles equipped EPA 2013 and beyond compliant diesel engines. An OBD compliant switch and harness, even in the off position, supply a small amount of power to the engine controller and enable certain emissions ..., The shop diagnosed the truck with a bad particulate sensor. The sensor was replaced and the code did not come back. The 3712 and 3714 codes however would not clear, and the engine was in derate mode. Below you can see the conditions for clearing the code: 3712 - Aftertreatment SCR Operator Inducement- Data Valid but Above Normal …, Some of the supported engines: Caterpillar: C15, C13, C9, C7 Cummins: ISX, ISL, ISB, ISC, ISM Paccar: PX6, PX7, PX8, PX9, MX13. Kenworth DPF delete. Are You sick & tired of all the issues with DPF filter & DPF sensors on Your Kenworth truck? Delete tuning* for Kenworth trucks is a solution! We can disable DPF regeneration and derates in Your ..., Simple Dealer level tool to reset fault codes and your emission system. Reset the 5 mph DEF derate and reset your fault codes at a dealer level. We also give you the option to run a Forced Regen. No need for OEM-level software. Works on EPA10 & EPA13, EPA17 Paccar Engines. Reset your system quickly to get your vehicle back up and running. , Simple Dealer level tool to reset fault codes and your emission system. Reset the 5 mph DEF derate and reset your fault codes at a dealer level. We also give you the option to run a Forced Regen. No need for OEM-level software. Works on EPA10 & EPA13, EPA17 Paccar Engines. Reset your system quickly to get your vehicle back up and running. , Just for future reference, The one with a wrench is a check engine light. The one without a wrench is the malfunction indicator lamp. The MIL indicates an emissions-related fault code (EPA requires certain failures of parts to illuminate an MIL). The CEL is everything else. It's rare on modern tractors that you'll have one light without the other., Turn ignition on , lightning bolt and check engine light and def quality derate on lcd all on. after about 5 seconds lightning bolt goes off, a couple seconds later the check engine light goes off. Again I clear the derate message with the guard dog. No codes. PROCEDURE Follow the troubleshooting attachment for enhanced diagnosis of the SCR …, Answered in 3 days by: Fault code description. This fault code is set by fault code P1496 (P1496 was active for 10 hours) This DTC activates an engine torque derate. Do not troubleshoot this DTC since it originates from another active DTC. Diagnostic Step-by-Step. Step 1. Investigate Related Trouble Codes., 2017 Peterbilt 348. PX9 engineGetting off and on codes. Hello and welcome to Just Answer, The engine was in a derate and the fault that is causing it is the fuel pressure relive valve failing and allowing excess fuel pressure in the system. The valve needs to be replaced to correct the fuel pressure issue. Then let the engine idle for 5 min and ..., Title: SPN-5246 FMI-16, SPN-5246 FMI-15, SPN-4364 FMI-18,... - DTNA Solutions Author: CORZARN Created Date: 4/28/2021 11:52:07 AM, STEP 3: Clean all your aftertreatment components. This includes all the components that have been contaminated by the oil, fuel, and coolant. Clean exhaust system piping after the turbocharger to the inlet of the DOC filter. Clean all temperature sensors and pressure sensors (use electrical cleaner)., The Edge Evolution line of devices are custom-made for specific models of trucks and allow users to adjust the settings of their truck's engine easily from a dash-mounted panel. The Edge Evolution device provides a clear screen that display..., Paccar Diagnostic Scanner. The diagnostic scanner for your Paccar engine enables you to perform forced DPF regeneration and so many advanced full system diagnostics, such as read and erase the fault codes, injector coding, NOx reset, DEF reset and derate, actuation tests and so much more we cannot list it all., Lucid Motors CEO and CTO Peter Rawlinson had a clear vision for how to take an electric car to another level. The former chief engineer of the Tesla Model S just didn’t expect it to take quite so long. Today, nearly four years since the com..., Product: https://otrperformance.com/products/otr-reset-tool-paccar-mxDTC FEATURES: Reset Active / Inactive FaultsOEM level commands, don't need to have Davie..., Dec 21, 2020 · Typically with a fault that states "engine derate in 3 hours," you'd be looking at an aftertreatment system fault. Typically something like an aftertreatment temperature sensor, a nox sensor, a DEF issue or something wrong with the DPF or SCR. Most of these issues wouldn't cause the engine to shut down and not restart as you have described. , To clear engine derate caused by a clogged air filter, start by locating the air filter housing. Remove the housing and examine the filter. If it is dirty or clogged, it …, Jul 28, 2017 · How to BYPASS DEF Derate on Paccar MX. DieselBullet. 14.4K subscribers. 68K views 6 years ago. Get home with these steps even if your truck is def derated. If this helped you get home, let me... , If your Freightliner DD13 DD15 won’t accelerate past 55 MPH there may be a few reasons as to why you are experiencing this issue. Main culprit for this 55 MPH Speed Limit = Onset of aftertreatment problems. Symptoms, causes, and fault codes to watch out for to prevent 55 MPH and a 5 MPH derate!, Nich1019. Cummins/Caterpillar Techni... Vocational, Technical or Tra... 6,149 satisfied customers. 2019 Kenworth t880 mx13 stop engine immediately only fault. 2019 Kenworth t880 mx13 stop engine immediately only fault code i get is p1514 I am currently doing a forest region to see if that helps … read more. Nich1019., Aug 1, 2017 · Perform these repair verification cycles following any corrective actions taken, to confirm that this trouble code is no longer present. Step P1514_2.A Verification Drive Cycle: Start-up SRT: With the brakes set, start the engine and allow it to run at idle for 2 minutes. Step 3. , Engine Reaction Derate 25% Verification Key OFF five minutes after repair Check as follows: 1. Turn the ignition OFF. 2. Disconnect the DEF dosing unit harness connector. ... Clear fault codes. Does the fault code change from SPN 3361/FMI 31 to SPN 3361/FMI 5? 5 SPN 3361/FMI 31 - GHG14 10 All information subject to change without notice., 0:00 / 1:22. How to clear DEF Derate on Paccar MX w/ Davie3. DieselBullet. 14.3K subscribers. Subscribe. Share. 13K views 6 years ago. Derate will not go away with just clearing codes. …