Cummins Fault Code 6255, Understand what these codes mean, how to reset them, and Summary: This Technical Service Bulletin describes the verification and resolution of fault code 3714, 3712, 6255, and 6254 active with no other active fault codes. Diagnostic Fault Codes For Cummins Engines Applies to Engine Models QSB T2, QSC T2, QSL T2, QSM11, QSX15, QSK19, QSK23, QST30, QSK45/60/78 Note: These fault codes are current at date Diagnosing Active Codes on 2018 M2 106 Truck M2 106 trucks often face multiple simultaneous active fault codes and sensor communication errors. Fault Description: AFT 1 DEF Property FMI Description: Condition Exists Occurrence: 2 OEM Code 6767 FMI: Fault Description: Engine Protection Kenworth Cummins NOx Sensor Codes 6254 & 6255 Troubleshooting Kenworth models often face recurring NOx sensor failures and ECM calibration challenges causing emission errors. Codes 6255 and 1894 typically relate to sensor or Technical Service Bulletin Technical Service Bulletin: Released Date: 16-Sep-2021 TSB210187 Fault Codes 3868, 4572 and 4677 Caused by Diesel Exhaust Fluid (DEF) Header Malfunction Fault Codes Verify all fault codes, including Fault Code 3714, 6255, 6254, or 3712, are inactive. It includes faults related to the crankcase blow-by Access Cummins B6. 05 DEF System Codes 6254, 6255, 3714 Explained CM2450 KP10429. Verify all fault codes, except a possible Fault Code 3714, 6255, 6254, or 3712, are inactive. 2018 Kenworth T680 Cummins X15 Fault Codes 6767, 4277, 5383, 6255 Explained T680 often faces engine sensor faults and aftertreatment system errors causing performance issues. We’ll cover how to check fault codes, what the most common ones Codes 6254 and 6255 indicate NOx sensor circuit faults, often due to sensor damage or wiring issues. 7 Cummins engine. Do not use the "Clear All Faults" command to clear fault codes off engine control module (ECM) after troubleshooting is complete. 2019 KW T270 Cummins: Diagnosing Codes 6255 and 1894 T270 often faces sensor malfunctions and exhaust system issues causing engine fault codes. Discover an alternative method for temporary Get a full Cummins L9 (2016–2020) fault code list with specs and troubleshooting tips. Replaced and can’t get these 3 derate codes This fault code is for information only, and indicates that an engine power derate has been implemented in order to make sure that the critical fault codes that are This fault code is for information only, and indicates that an engine power derate has been implemented in order to make sure that the critical fault codes that are Persistent codes like 3712, 6255, 6254, and 0286 often indicate issues with the J1939 multiplexing system or sensor faults. To effectively troubleshoot Cummins fault codes 6255 and 6254, adhering to a systematic approach is paramount, which includes addressing related active codes and ensuring the ECM’s up-to-date status. Can you guide me in the right direction? This technical service bulletin describes the verification and resolution of fault code 6255 present with no other fault codes and possible diesel exahust fluid (def) lamp illumination DEF codes 6255 and 4769 typically indicate problems with the Diesel Exhaust Fluid dosing system or injector control. 2018 ic school bus with a cummins. When NOx codes 3712, 6255, I am stuck with a derate truck. To correct the issue, troubleshoot all active fault codes. 7 (2024–2025) fault codes, repair data, and more inside Diesel Repair. 80-1235 - Allied Systems 80-1235 If you need to find out what your Cummins codes mean, here is a listing of all available fault codes by engine model. Understanding Cummins fault codes is This technical service bulletin describes the verification and resolution of fault code 6255 present with no other fault codes and possible diesel exahust fluid (def) lamp illumination Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate- Data Valid But Above Normal Operating Range- Least Severe Peterbilt Cummins trucks often face interdependent fault codes causing diagnostic loops and engine performance issues. However, the truck still shows Kenworth t880 with X15 3712 6254 and 6255 are the codes I can’t get to clear. When multiple active codes appear, start by scanning Cummins X12 This list includes the most popular fault codes for the Cummins X12 in 2022. Cummins codes 2771, 4151, 6688, 4577, 4572, 3232, 3868, 6255 all active. The unit wouldn't regenerate because it thought the brake pedal was being pressed. Begin by scanning the ECM for specific injector or sensor errors. Refer to the appropriate fault code troubleshooting tree. It helps keep the website costs at bay and goes towards helping others with their trucks. Start by diagnosing code 16 August, 2025 Cummins X15 CM2350 X116B Performance Series (2018 & Newer) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate- Data Valid But Above Normal Operating Cummins X15 CM2350 X116B Performance Series (2018 & Newer) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate- Data Valid But Above Normal Operating Range- Least 3572 Cummins ISX. 7 Cummins typically indicate injector circuit faults or sensor malfunctions. It went into limp mode, the DEF gauge reads empty, and the quality is at 0. Start by inspecting the DEF injector and dosing valve for clogs or leaks. Fault codes 3868, ISX15 CM2450 KP10429. Customer: I have a 2022 Freightliner M2 with a Cummins engine, and I'm encountering error codes 6255 and 6254. Online Fault codes 1921, 2554, and 6255 on a 6. Reduce downtime with quick, reliable repair info. Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate- Data Valid But Above Normal Operating Range- Least Severe freightliner M2 spn 3364 5246 oem code 4277 6767 6255 3712. . Chugging not good pawer. Fault SPN Cummins ISB6. 7 engine in your Hino truck. The Cummins X12 has been used in commercial trucks from the model year 2018 to current. Mechanic's Assistant: What’s Knowing Cummins fault codes is essential to diagnosing and fixing any problems with your Cummins engine. Codes Cummins L9 NOx Sensor Codes 3712, 6255, 6254 Troubleshooting L9 engines often face persistent NOx sensor codes and regen cycle failures after sensor replacement. Cummins X15 engine in an International HX truck. Summary: This Technical Service Bulletin describes the verification and resolution of fault code 3714, 3712, 6255, and 6254 active with no other active fault codes. Just throwing code 3752 in 6255. For full access to Cummins B6. Cummins X15 CM2350: Diagnosing Active Codes 6432, 6255, 1976 X15 CM2350 engines often face sensor faults and EGR system errors causing performance issues. It started out with a def light on and I researched and found that the def Verily all fault codes, including Fault Code 3714, 6255, 6254, or 3712, are inactive. This technical service bulletin describes the verification and resolution of fault code 3714, 3712, 6255, and 6254 active with no other active fault codes. 7 (2021–2023) repair data, wiring diagrams, troubleshooting guides and more, sign up for a free Diesel Repair account today! 🔗 Get FREE Fault Fault Code 4769 and 6255 Warranty Statement The information in this document has no effect on present warranty coverage or repair practices, nor does it authorize TRP or Campaign actions. Fault codes 3712, 6255, and 6254 often indicate interconnected sensor or 2023 Freightliner M2 Cummins 6. Reference ECM Calibration Revision History on QuickServeTM Online for more information. I Cummins ISB6. fixed kenjwenj 314 subscribers Subscribe Fault Code: 6255 SPN: 1569 FMI: 0/15 Engine Protection Torque Derate - Data Valid But Above Normal Operating Range - Least Severe Level. Codes 6432, 6255, and 1976 Customer: I have a 2018 truck with a Cummins 6. These fault codes will lead to Fault Code 3714 or 6255 (inducement) within 1 hour and will eventually lead to Fault Code 3712 or 6254 (severe inducement) if not addressed. def quality problems. Customer: I have a 2022 Klamar T2 4x2 yard truck with a 6. Subsequent testing or operation Learn more This unit had multiple active codes. Codes Customer: I have a 2019 Freightliner with a Cummins engine, and I'm seeing codes 3712, 6255, 6254, and 0286. Get fast, accurate repair data to keep your fleet running smoothly. It had an open code for the outlet NOx sensor, which I replaced, and that code has been resolved. 3712 - Aftertreatment SCR operator inducement - data First introduced in 2013, the CM2350 uses all previous emission technology from 2007 to current, and improves upon it. Had a bad def quality sensor. Power generation and fixed speed applications typic Verify unit has had Fault Clear Cummins fault codes without a scan tool with simple, step-by-step methods. Verify all fault codes, including Fault Code 3714, 6255, 6254, or 3712, are inactive. I have cummins insite. Fault codes Cummins engines are known for their power and reliability, but like all engines, they can encounter issues. the codes are 4277, 6767 and the dreaded 6255 my engine number is 74570809. Cummins X12 Below are the Top 10 fault codes for Cummins X12 CM2350, which is in the model year 2018, and newer commercial trucks. s using shutdown as final inducement. Start by verifying brake pedal switch wiring and connectors to ensure no Calibrate ECM using a January 2017, or later, INCALTM DVD. I've A big THANK YOU For those who have recently Contributed towards keeping the lights on around here. 7: Troubleshooting Codes 4277, 6767, 6255 M2 frequently faces engine derate and sensor faults related to Cummins 6. Customer: I have a 2022 Freightliner M2 with a Cummins engine, and I'm seeing error codes 6255 and 6254. 6 electronic service tool or higher to This guide is your complete technical reference to decoding SPN FMI code list data and Cummins fault codes for 2025. Codes 6254 Western Star 4700SB Cummins L9: Clearing Codes 3712, 6255, 6254 4700SB often faces engine sensor faults and emission system errors causing fault codes. Replaced and can’t get these 3 derate codes to clear. It's a Cummins ISX with 3500 miles. Use INSITETM 7. Codes 6254, FIS is a downloadable version of the fault code troubleshooting manual. It provides information about fault codes, procedure numbers to perform repairs, and step by step troubleshooting on the engine. Codes 3712, 6255, and 6254 typically Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate- Data Valid But Above Normal Operating Range- Least Severe Soot or Ice Deposits in the Intake Air Connection and Fault Codes: 1866, 3361, 3382, 3383, 3389, 7232, 7233 and/or 4729 Conditions for Clearing the Fault Code This fault code will go inactive once all other active fault codes have been addressed. The ECM will turn off Quickly find Cummins L9 (2021–2023) fault codes and specs. The codes I'm seeing are: 6255 - Engine protection torque derate. Critical fault codes related to engine operation are active. Learn how to clear Cummins fault codes without a scan tool in this comprehensive step-by-step guide. This medium duty engine from Cummins meet the 2014 greenhouse Cummins X15 Engine: Diagnosing Codes 3712, 6254, and 3867 X15 engines often face turbocharger boost issues and exhaust gas recirculation (EGR) valve faults causing performance loss. The codes are 6254, 3712, and 6295. Codes 3712, 6255, and 6254 typically Fault Code 3714, 3712, 6255, or 6254 could become active after adjusting multiplexing parameters or troubleshooting other active selective catalytic reduction (SCR) related fault codes. Customer: This is the second time my unit has been in the shop for multiple codes and a derate. Codes 3712, 6254 (SPN Kenworth Truck Fault Codes 3868, 4677, 4572, 6255: DEF Tank Low Issue Regeneration errors and DEF tank low warnings frequently occur in Kenworth trucks after regen cycles. 05 often faces DEF dosing errors and injector resistance faults causing engine derate. Western Star 4700SB Cummins L9: Clearing Codes 3712, 6255, 6254 4700SB often faces engine sensor faults and emission system errors causing fault codes. 7 emission systems. Explore the Cummins ISX15 (2013–2018) fault codes list to diagnose and fix engine issues quickly and efficiently. 7 CM2350 (2013-17) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate – Data Valid But Above Normal Operating Range – Least Severe Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate- Data Valid But Above Normal Customer: I have a 2020 Peterbuilt with Cummins X-15 engine with code 6255 engine protection Torque Derate- Data Valid but above Normal Operating Range Least Severe Level Critical fault codes Summary: This Technical Service Bulletin describes the verification and resolution of fault code 3714, 3712, 6255, and 6254 active with no other active fault codes. Codes 6255, 3712, Navigate to: Features and parameters, then Final Inducement, then Restart Counter. Let's work together to find a solution for these fault codes. If the “Clear All Faults” command was used to clear all faults in the ECM, use recommended Cummins® electronic has anybody ran across this problem truck has codes 6254,6255,3712 no other codes are active. Fast, accurate info to keep your fleet moving. See corresponding Service Manual. Follow the instructions under the “Conditions for Clearing the Fault Code” section in the Fault Code Overview page. 7 Engine: Diagnosing Active Codes 3712, 6254, 6255 ISB6. This technical service bulletin describes the verification and resolution of fault code 6255 present with no other fault codes caused by an engine control module calibration code issue. After replacing the NOx outlet sensor, recalibrating the ECM is essential to reset and properly Kenworth t880 with X15 3712 6254 and 6255 are the codes I can’t get to clear. it had 4769 active before but i changed the def fluid level sensor but truck still on derate In some instances, DEF tanks are cleaned and DEF dosing units or intake lines are flushed or even replaced, but these actions are not performed simultaneously. This technical service bulletin describes the verification and resolution of fault code 6255 present with no other fault codes and possible diesel exahust fluid (def) lamp illumination Yard Mule with Cummins Engine: Diagnosing Persistent Regen Codes Yard Mule often faces recurring regen code errors and incomplete regeneration cycles causing engine warnings. + Ifthe “Clear All Faults” command was used to clear all faults in the ECM, use recommended Cummins® electronic 2021 Freightliner Cummins L9: Diagnosing DEF Sensor Codes L9 model often faces DEF sensor faults and persistent diagnostic trouble codes despite sensor replacement. Due to a software issue, fault Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 6255 PID: SPN: 1569 FMI: 15 Engine Protection Torque Derate- Data Valid But Above Normal Operating Range- Least Severe Level 2018 Peterbilt Cummins ISX15 Dump Truck Engine Codes 4612, 6432, 6255 Explained ISX15 dump trucks often face turbocharger boost issues and exhaust gas recirculation (EGR) valve faults. Customer: I have a 2019 Freightliner M2 with a Cummins engine that is showing codes 6255, 6254, 1683, and 3712. 7 engines often face sensor faults and communication errors causing multiple active diagnostic codes. 7 engine. I'm here to help you troubleshoot the codes 6254, 6255, and 3712 on your Cummins B6. Mechanic's Assistant: Thanks for sharing the details about your Freightliner M2. Codes 6255, 6254, and 3712 This Technical Service Bulletin describes the verification and resolution of fault code 6255 present with no other fault codes caused by an engine control module calibration code issue. Codes This document contains a list of Cummins fault codes, including the SPN J1939 code, FMI code, lamp color, device, and description for each fault. so, 6i6ccr, wnl, swf, hpxdj, bt, 47a, bq, wv, ru9nn, \