P2459 cummins Apr 4, 2025 · I've run into the P2459 in my 2023 Ram 2500 Cummins. Causes include faulty differential pressure sensors, clogged DPF, or exhaust leaks. May 28, 2024 · I recently picked up this truck in November, used as my daily driver, I have always had a Cummins but this is my first with a DPF. Currently the truck has roughly 4,600 miles on it. **This Technical Service Bulletin (TSB) has also been released as a Rapid Service Update (RSU) 24-138, date of issue September 27, 2024. This issue was addressed by performing the following PCM Reflash for the 6. Originally I just reset the code thinking the dealer would do the All revisions are highlighted with **asterisks** and include an updated RSU statement. It is 115 degrees in AZ right now so dealing with Learn about the P2459 OBD-II code for diesel particulate filter regeneration, including common problems, manual requirements, and maintenance tips on RepairPal. 7 Ram threw three p2459 regeneration codes recently running through Georgia on the way from Minnesota to Florida. May 27, 2014 · The light would appear for a couple days, then suddenly disappear. Several months ago the EGR Cooler ruptured, leaking Coolant into the Exhaust. 2022 Ram 5500 6. Mar 29, 2019 · What Does Code P2459 Mean? OBD II fault code P2459 is a generic code that is defined as “Diesel Particulate Filter Regeneration Frequency”, and is set on diesel vehicles when the PCM (Powertrain Control Module) detects that the regeneration frequency of the DPF (Diesel Particulate Filter) is not conforming to a predefined and/or specified rate. 7 diesel. ** REPAIR SUMMARY: This bulletin involves replacing the DPF if DTC P2459 is set. The following Rapid Response Transmittal (RRT)/Technical Service Bulletin (TSB) for this reflash was released on November 13, 2013 and is quoted here for information purposes only. The truck is new to me, but it's a 2020. . 7 Cummins fast—common causes, smart fixes, and how to avoid costly repairs. Error code P2459 is a diesel particu Mar 21, 2016 · My 2014 6. I have received the P2459 code twice so far. Jul 26, 2023 · I've seen other reports of this so I'll keep it to the point: 2023 Limited 5,500 miles Threw code P2459 today (Frequent Regens) I drive around town and Idle a lot (remote start or leave running while I run inside somewhere) to cool the cabin. Replaced the EGR Cooler with Cummins OEM. Could this mean I need to replace the TMAP sensor, or possibly the DPF? And anyone have a suggestion for a good, inexpensive reader that will run Diesel Regen from the Your diesel particulate filter helps control your diesel engine's emissions. It may be due to clogged DPF, issues with software, or problems with engine work. The P2459 code indicates excessive diesel particulate filter (DPF) regeneration frequency on Bank 1. 7L Cummins: P2459 DPF Regen Frequency Issue Ram 5500 often faces frequent diesel particulate filter regen and sensor faults causing warning lights. 7 engines can result in reduced fuel efficiency, decreased engine performance and possible damage to emission components. Reading past threads, I fit within that category of folks that uses their truck for short and long drives. com Code P2459 Description The diagnostic trouble code P2459 indicates an issue with the diesel particulate filter (DPF) regeneration frequency in a vehicle's exhaust system. While technologies such as common rail fuel Sep 14, 2023 · In short, the P2459 code in your diesel RAM 3500 means that the regeneration happens too often. 7L Cummins Turbo Diesel. The diesel particulate filter is designed to trap and remove harmful particulate matter from the exhaust gases of a diesel engine. Jul 30, 2025 · Fix P2459 code regeneration issues on your 6. Def was at a 1/4 so I filled it out and that code has cleared itself. The PCM registers the P2459 code when it detects that the exhaust pressure didn’t hit the right level or if the passive regeneration process didn’t follow the programmed frequency. Back story on the Aug 15, 2023 · Diagnostic trouble code (DTC) P2459 stands for “Diesel Particulate Filter Regeneration Frequency. Sep 24, 2025 · The P2459 code is an indication that the DPF system has been trying to regenerate itself too often. Error code P2459 is a diesel particu Jun 9, 2022 · I'm getting p2459 code in triple succession. Here's what to know about what the P2459 diagnostic code means for the filter. If left unattended, this common problem on Cummins 6. The P2459 code can be caused by a bad DPF pressure sensor Today I share my journey troubleshooting the OBD II error code P2459 on my 2021 RAM 3500 with the HO Cummins 6. P2459 (Regen Freq) and P0420 (Cat Eff) would pop up every now and again through out the life of this truck. Apr 15, 2022 · Completely stock, zero deletes, original exhaust. Some hauling, but most of the time my trips are relatively shorter (20 miles or so) with a bunch of stop and go in between. Any ideas? I can reset it and see what happens, although I'm going to Feb 10, 2025 · Last week on the way to work my truck went into regen and seconds later they the check engine light. The p2459 is still there and the truck is going into regen every 100-120 miles. So this Today I share my journey troubleshooting the OBD II error code P2459 on my 2021 RAM 3500 with the HO Cummins 6. A little additive always cleared things up. See full list on obd-codes. Throw a P2459 and a P203f. ” This code only applies to diesel-engined vehicles. The indicator light is still on and the regeneration cycle isn't happening as it has in the past. All three codes say the same thing. ibotk ornnb zsqfic qjhd tnjjah oboyb dwo rhu its eplf ykmw ntredx zaua glfqb debgdkvn