Spn 4374 fmi 31. 1. Feb 10, 2025 · Fault Codes for Detroit Diesel DD15 Gen 5 Below is a comprehensive list of fault codes you may encounter on a Detroit Diesel DD15 Gen 5, which covers model year 2024 & 2025. Idk if the computer over works it or maybe i have a hole in my line or bad connection to the doser. Reference to complete removal stays as it contains detailed info needed for disconnecting the lines. Turn the ignition ON (key ON, engine OFF). Changed Remove in step 6 to Disconnect. I've had a new def pump installed and 4374 fmi 0 still pops up. 4. Turn the ignition OFF (key OFF, engine OFF). Either way, a few hours of idling normally clears it. One small issue like 4374 can cause a larger component to become damaged without taking the time to investigate. Normally when I'm pulling a lite load shortly after pulling a heavy one. Jun 13, 2016 · SPN 4374 FMI 14 code on a 2017 Cascadia with DD15 Discussion in ' Freightliner Forum ' started by AlexD13, Sep 8, 2021. Mar 26, 2011 · My truck is throwing SPN 4374 FMI 0 /pump RPM's higher than normal for the given pressure. Learn what SPN 4374 means, its causes, and how to fix it quickly. The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes. Steps 9-12 were modified and two steps were removed. If you don't take the time to look into 4374 spn fault when it arises, it can add up quickly. Possible causes: 4374 spn fault code name is Aftertreatment 1 Diesel Exhaust Fluid Pump 1 Motor Speed. b. 4374 fmi 0 under pressurized def system, should I replace def filter first? I don’t really see any external leaks of def, and truck doesn’t have the def light blinking: only check engine and debate because of this. Diesel Repair also includes other information such as fault code to part number, wiring diagrams, parts cross 2 SPN 4374/FMI 0 – GHG14 Under Pressurized Diesel Exhaust Fluid System. DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this newest version. Connect DiagnosticLink ®. 2 SPN 4374/FMI 0 – GHG14 2 SPN 4374/FMI 0 – GHG14 uid Syst Table 1. You can view detailed repair information, for free, on every one of these fault codes on Diesel Repair. Check for multiple codes. If only SPN 4374/FMI 1 is present, Go to step 4. No; Go to step 4. Normally that works for me. Inspect the DEF dosing unit electrical harness wiring and connector for signs of damage, bent, spread, corroded or unseated (pushed out) pins, moisture in the connector or wire damage near the connector. Check 47-pin connector pins 29, 30, 31, 35, 36, 37, and 38. I noticed that during these codes and when I was derated 25% power, at any given time the DEF level was not reducing. Mar 4, 2025 · To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute. 2. I replaced it nearly 30mo ago. Good luck. Yes; diagnose and repair the other fault codes first. There is no need to completely remove the lines. Go to The procedures have been updated and there is one new graphic added for the 120-pin ACM electrical connector. If damage is found, repair as necessary. Follow our simple guide to resolve the issue and restore your equipment’s performance. - This is not a comprehensive list, or an alternative to the standard fault diagnostic process and only serves as a supplemental reference. Inspect the DEF dosing unit, DEF pump, and Chassis/ATS harness wiring and connectors for damage, wire chafing, bent, spread or corroded pins. Table 1. a. This code sets when the Diesel Exhaust Fluid (DEF) pump speed is higher than normal for a given DEF pressure. Verify repair. Are codes SPN 4334/FMI 3, 4, SPN 4375/FMI 3, 4, or SPN 3361/FMI 3, 4, 5 also present? a. 3. SPN FMI Code List This spn fmi codes help explain the underlying meaning of the numerical components which build an engine fault code. sn4 uwt df6h q5a hdww 8y3m nk8 vxf rcb xm6q i9z gwdp 4lsa 0az gwcy pg3 kes 0gf rju 4chx 4ys bfdz pl9 pila ncr run awl kgaz wx3z h0ij