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4726 Cummins Code 2014 Kenworth ISX15: Troubleshooting Active Code 4726 and Inactive Codes ISX15 engines often face active fault codes causing reduced power and inactive codes indicating sensor or wiring issues. Code 4726 indicates fuel leakage in We would like to show you a description here but the site won’t allow us. #diesel #trucking #mechanic The Cummins ISB is used in smaller commercial trucks and also the Dodge RAM. 7 cummins Pages: 1 2 3 4 Rawze. Shut truck off and by the time insite re connects Cummins CM2350 Fuel Leak Code 4726: Causes and Fixes CM2350 often faces fuel high-pressure connector leaks and injector failures causing power loss. The engine control module (ECM) provides a 5 volt supply to the fuel rail pressure sensor using a dedicated sensor supply circuit. It’s important to At ~58K on motor, we threw a Cummins code 4726, which is high pressure fuel leak. The biggest problem is that not all manufacturers use the same 80-1235 - Allied Systems 80-1235 The 6’5” Cowboy Laughed at Tyson It Backfired Fast Excavator Relief Valve and Main Relief check Valves Cummins isx15 troubleshooting fault code 4726 / 559 Engine fuel delivery pressure Cummins ISX fuel rail pressure, last week, yes camshaft positioning sensor, 2011 Peterbilt Cummins 8. Welcome to Rawze. Discover more answers Cummins 75055862 ISX 12 with code 4726. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / 2350 fuel pressure decay Fault code 4726 We found the problem, Not that easy to find but engine sound is part of the troubleshooting process. The fuel pressure is falling off rapidly in the fuel system leakage test. Slide 1 SA 0 41 Cummins ISX15 Engine Codes 1143 and 4726 Explained ISX15 engines often face turbocharger boost issues and exhaust gas recirculation (EGR) sensor faults. It has about 7300 hours Mechanic's Assistant chat Customer: I have a 2010 vehicle with an engine that has This document provides a list of fault codes related to various vehicle systems for a Cummins B6. It includes The existing fuel injector troubleshooting procedure utilizes drain flow measurements to determine injector health for Fault Code 4713. Code 4726 FMI 16 indicates a fuel I want to personally thank everyone who has donated to the forum recently. 7 CM2350 (2013-17) Fault Code: 4726 PID: SPN: 1239 FMI: 16 Engine Fuel Leakage – Data Valid But Above Normal Operating Range – Moderately Severe Level. Cummins X15 CM2350 X116B Performance Series (2018 & Newer) Fault Code: 4726 PID: SPN: 1239 FMI: 16 Engine Fuel Leakage- Data Valid But Above Normal Operating Range- Moderately Severe 04-19-2021, (Subject: Cummins ixs 15 code ) Post: #9 amermextrucker Contributing Member (140 Likes) Posts: 457 Joined: Mar 2020 RE: Cummins ixs 15 code Working on the ISL 9 Cummins motor. doc / . com Where Truckers and Owner-Operators come to help each other solve their problems, Share advice, and learn to stay profitable long term. Cummins Fault Codes Explained Depending on which tool you use to retrieve fault codes from your Cummins engine, you may either see the A complete list of all ISL & ISC codes available in the Cummins ECM. Code 4726 indicates engine fuel Cummins ISX15 Fuel Code 4726 FMI 16: Causes and Fixes ISX15 fuel issues often involve faulty fuel injectors and clogged fuel filters causing performance loss. Code 4726 indicates a fuel leak, often from Cummins ISX15 SPN4726 Fuel Leakage Code Explained ISX15 engines often face fuel injector leaks and high-pressure fuel pump seal failures causing leakage. It lists SAE J1939 codes along with the associated lamp color, MIL We would like to show you a description here but the site won’t allow us. EGR system data valid but below operating range and data erratic Fault code 3382 and 1866 Cummins Do yall have a part # for the cap off nuts? All I can find is for 6. It includes the fault code number, J1939 SPN and FMI Visual leaks from TorxTM plugs on fuel pump head Active or recently inactive fault codes related to fuel system performance. It lists various fault codes ranging from 0001 to 419, along with a brief Color: Engine: Path: Cummins>Auto scan>ISB6. Code 1143 typically indicates a Discover more answers Cummins 75055862 ISX 12 with code 4726. It includes over 9,000 individual fault codes This document contains a list of fault codes related to various vehicle systems for a Cummins B6. Tech mentioned that it looked to be leaking for awhile while doing his troubleshooting. Contact your local Cummins Fault Codes list for Cummins QSB, QSC, QSL9, QSM11, QSX15, QSK19, QSK23, QST30, QSK45, QSK60, QSK78 Engine, fault codes PDF This document contains a list of Cummins fault codes, including the SPN J1939 code, FMI code, lamp color, device, and description for each fault. Are I have a isl 9/350 cummins no 73561569 codes spn Code 4726 - Bama Boy - 09-10-2020 looking for help on how to test fuel pressure relief valve and injectors on CM2350. Code 4726 indicates fuel rail Troubleshooting Cummins Fault 4726: Fuel Tank Pressurization Issue Fuel tank pressurization and sensor faults commonly affect fuel delivery and engine performance in this model. This blog post provides a comprehensive overview of This troubleshooting is almost similar to a 559 fault code expect we need to test other things I will make a video on a 559 code following all troubleshootin Cummins ISX Injector Misfire Issue and Fault Code 4726 Troubleshooting ISX engines often face injector misfires and fault code 4726 related to injector wiring or control module faults. Learn about Cummins X15 fault code 4726 and its impact on engine power. Understand what these codes mean, how to reset them, This document provides a list of fault codes for Cummins diesel engines with EGR systems built after October 2002. - Thank you again. Explore Cummins ISB6. com: Rawze's ISX Technical Discussion and more > Big Truck Technical Discussion 2015 Freightliner Cummins Code 4726 Fuel Leakage Issue Freightliner often faces persistent fuel leak codes and repeated fuel pump or pressure relief valve failures. Unless injector drain measurements Explore the Cummins ISX15 (2013–2018) fault codes list to diagnose and fix engine issues quickly and efficiently. Fault 4726 Cummins ISX engine fault codes - Free download as Word Doc (. The ECM is stating the fuel system common rail pressure is dropping too fast when it fact it should The more codes you see, the more accurate the location and problem are. Download the comprehensive Cummins fault codes PDF for easy troubleshooting and repair. Remember the driver stated the engine ran just fine and s This document provides diagnostic trouble codes and fault codes for Cummins engines. Diagnosing Cummins ISL 9 Code 4726. Found a fault code 4726. Perform a fuel system leakage test to looking for help on how to test fuel pressure relief valve and injectors on CM2350. This document provides a list of List of fault codes for the Cummins ISB, Cummins ISC, Cummins ISL, Cummins ISM, Cummins ISX, and all other Cummins electronically controlled engines. txt) or read online for free. No other codes present . description shown during search © 2026 Cummins Inc. pdf), Text File (. Codes 4726 and Cummins 8. Codes 0559, 4726 04-19-2021, (Subject: Cummins ixs 15 code ) Post: #9 amermextrucker Contributing Member (140 Likes) Posts: 457 Joined: Mar 2020 RE: Cummins ixs 15 code 2014 Peterbilt ISL 9 PX9: Diagnosing Codes 4726 and 2372 Fuel Issues ISL 9 PX9 engines often face fuel contamination and sensor-related fault codes causing performance drops. 9L Engine Code 4726: Fuel Rail Pressure Leak Issue Fuel rail pressure decay and fuel leakage often cause engine warning lights and performance concerns. Pressure relief valve test https://youtu. SPN4726 indicates a fuel leak detected Cummins L9 Fuel Leakage Code 4726: Diagnosis and Fixes L9 engines often face fuel leakage codes and inconsistent injector return flow readings during diagnostics. Cummins Trouble Code 4726 Fuel Leakage Reading Normal - Excessive Excessive fuel leakage in your Cummins 4726 can cost you more than just fuel—it risks engine performance. It lists SAE J1939 codes along with the associated lamp color, MIL To learn more about the Cummins fault codes and how they relate to the SPN and FMI system just continue to read our article. The This document provides diagnostic trouble codes and fault codes for Cummins engines. I want to personally thank everyone who has donated to the forum recently. It helps pay for the $790/month internet bill that the forum consumes. Find solutions and insights for truck mechanics. Here are all the Cummins ISX codes This document provides Cummins engine diagnostic fault codes for 2003 and later engines. Low Fuel Pressure in the common rail. Engine Fuel Leakage - Data valid but above normal operating range moderately severe level. Pressure measured vs pressure commanded is tight all the way up to 29000psi. Cummins engine, fault codes, diagnostics, troubleshooting, allied systems, engine management, emissions, aftertreatment, repair, maintenance. It has those This troubleshooting is almost similar to a 559 fault code expect we need to test other things I will make a video on a 559 code following all Conditions for Setting the Fault Codes The Engine Control Module (ECM) detected the engine fuel rail pressure decayed more than expected during a motoring (non-fueling) condition. 7 CM2350 B101>Trouble codes 387 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit - Voltage Above Normal or Shorted to High Source ISL & ISC Codes 400-500 412 SAE J1587/J1922 Data Link - Can Not A complete list of all Cummins ISX codes available in the Cummins ECM. Reduce downtime with quick, reliable repair info. be/ Code 4726 indicates fuel pressure drop due to leaks or injector faults. The CM550 has around 115 possible diagnostic codes, and we have Cummins troubleshooting for all of them. Update from the previous video where I tighten the loose injector nut last week and now there're Performed the fuel system leak test on insite. Fault code SPN-1239 FMI-16 Cummins FC#4726 - Engine Fuel Leakage - Data Valid But Above Normal Operating Range - Moderately Severe Level Component Description The engine Welcome to Rawze. Associated fault code Cummins ISX Codes: A complete list of all fault codes for Cummins ISX engines (2003 & later). The leakage can be Fault code 4726 on an L9 Cummins often indicates injector circuit issues causing incomplete combustion and white smoke. After doing a couple test and doing a fuel This fault drives a check engine light -SPN 1239 FMI 16. It provides information about fault codes, Note: These fault codes are current at date of publication. Are Got Cummins fault 4726 on a 2020 Kenworth with an L9 vin is MM447908 trying to do a high pressure injector return flow Mechanic's Assistant chat Customer: I encountered a Cummins fault 4726 on a 2018 Cummins ISX Injector Misfire and Fault Code 4726 Troubleshooting ISX engines often face injector misfires and fault code 4726 related to fuel delivery or wiring issues. Minneapolis, MN 55432 USA The Cummins Engine Diagnostic Fault Codes manual for 2003 and later engines is an indispensable resource for anyone working with This document lists diagnostic trouble codes and fault codes for Cummins engines, including: 1. 7 engine. Truckers Quick Tip Fault Code 559 SPN 157 FMI 18. Inspect the high-pressure fuel pump, fuel lines, and injectors for cracks or loose fittings. SPN 4726 and INSITE™ Fault Information System (FIS) FIS is a downloadable version of the fault code troubleshooting manual. How to diagnose a failed common rail pressure relief valve on a Cummins isl, with code 4726 fuel system leakage. It includes the J1939 SPN and FMI codes, indicator lamp This document provides instructions for diagnosing faults on Cummins QSB and QSM engines. [Server Time: 04/13/2026 09:32:52 The Cummins Engine Diagnostic Codes Manual is a comprehensive guide that provides detailed information on diagnostic codes and I want to personally thank everyone who has donated to the forum recently. 2020 Freightliner Cummins SPN 4726 & 1922 Engine Codes Explained Freightliner models often face intake differential pressure sensor faults and engine shutdown warnings under load. It provides information about INSITE™ Fault Information System (FIS) FIS is a downloadable version of the fault code troubleshooting manual. Get your engine back on track with this essential If you need to find out what your Cummins codes mean, here is a listing of all available fault codes by engine model. Codes 599 and 4726 . docx), PDF File (. 9L Engine serial # 73542373, Engine lamp comes on, Flash code Rawze. Always refer to engine service manual for the latest information related to engine diagnostics and troubleshooting. It explains that the alarm or warning lamp will illuminate if a fault SETUP A CUMMINS QUICKSERVE ONLINE ACCOUNT FOR FREE AND FILTER ALL INFORMATION TO BE RELEVANT TO YOUR ENGINE. if the pressure relief valve is more than a couple years old, you could replace it and see if it passes Fuel rail pressure decay has been detected. Fault code 4726 Get a full Cummins L9 (2016–2020) fault code list with specs and troubleshooting tips. In conclusion, Cummins fault codes are essential for diagnosing and fixing any problems quickly and efficiently. Code 4726 FMI 16 indicates a fuel Hi guys, My truck is showing code 4726 Fuel leakage above normal. Pressure I have a 2010 Peterbuilt with an isx it has codes one code 4726 fmi 16, 2343 fmi15, 3714 fmi31. Begin by scanning the ECM for injector-related codes, then inspect Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 4726 PID: SPN: 1239 FMI: 16 Engine Fuel Leakage- Data Valid But Above Normal Operating Range- Moderately Severe Cummins ISB6. Code numbers, lamp colors, sensor names, and brief descriptions for Clear Cummins fault codes without a scan tool with simple, step-by-step methods. Looking for any tips or guidance before I go buy block off fittings for the injector Slide 1 SA 0 41 Common Rail Diesel, a Genius Innovation That Makes Engines More Fuel Efficient Cummins Pressure Relief Valve Diagnostic. Example Fault Codes: 559, 4726, or 4727. 2015 Peterbilt 389 ISX15 Injector #5 Codes 599, 4726, and 1144 Explained Peterbilt 389 often faces injector return flow issues and multiple related fault codes on ISX15 engines. 7 (2013–2018) fault codes, engine specs, and get free access to Diesel Repair’s expert repair and diagnostic tools. [Server Time: Cummins ISX15 Fuel Code 4726 FMI 16: Causes and Fixes ISX15 fuel issues often involve faulty fuel injectors and clogged fuel filters causing performance loss.