Ram 3500 check engine light comes on

Filed Sep 24, 2026 · Engine · FL

The truck has a CEL P2459. The unit was taken back to the dealer on June 15, 2026, and they diagnosed an aftermarket air cleaner and regeneration. The CEL continued to display P2459, and I returned the truck to the dealer on 9/23. The dealer stated I had a defective air cleaner housing and was willing to pay 80% of the cost. They also said the restriction likely caused the DPF filter to plug because it caused excessive DPF generation. I believe this defective air housing may be on multiple units since these are likely purchased in batches. Ram should replace all air cleaner housings from the manufacturer batch related to my unit. They should also cover any parts caused by this defective air cleaner housing. Ram should cover the plugged Diesel Particulate Filter and the air cleaner housing.

Filed Aug 28, 2026 · Electrical, Fuel system · 1,000 miles · TX

The contact owns a 2025 Ram 3500. The contact stated that shortly after purchasing the vehicle brand new and filling the fuel tank on December 3, 2025, the DEF depth gauge failed. The vehicle was taken to a dealer, where the module was reprogrammed and the physical gauge was replaced. However, the contact obtained internal service notes revealing that the urea pump, the DEF tank, the urea tank wiring harness, the DEF injector, and the fluid had actually been replaced due to an active fuel leak within the DEF system. On March 31, 2026, the vehicle was taken back to the dealer to address a malfunctioning digital rearview mirror. While at the dealer, a recall repair was performed under the federal safety agency Campaign Number: 25V882000 (Air Bags, Electronic Stability Control (ESC)). The digital mirror was replaced; however, the failure recurred immediately. In May 2026, the vehicle was returned to the dealer for the ongoing mirror issue; however, the service notes only indicated that a part adjustment was performed, and the defect persisted. The contact then took the vehicle to a second dealer to repair the digital mirror and address the DEF system, as the warning light had re-illuminated on the instrument panel. During this visit, the second dealer performed a recall repair under the federal safety agency Campaign Number: 26V059000 (Exterior Lighting, Electrical System). While the dealer claimed to have serviced both the DEF warning light and the mirror, the mirror failure remained unresolved. After spending a cumulative month at the dealer, the vehicle was diagnosed with an illuminated check engine light caused by a recurring DEF-contaminated fuel leak. The dealer replaced the entire DEF assembly, including the fuel system components, and cleared the DTCs. In July 2026, the vehicle was returned to the dealer yet again for another digital mirror replacement, which failed to resolve the issue. The contact believed there was an inherent manufacturing flaw at the top of the fuel tank causing the repeated DEF system failures. The vehicle was not repaired.

Filed Aug 5, 2026 · Driver assistance, Electrical · FL

Started with only 320 miles just days after purchasing this new 2026 RAM 3500 on XXX. I have taken the truck to three differ RAM dealerships as this issue continues to occur. [XXX]; [XXX]; and [XXX] Westside all had attempted to fix the issue. I had to return the truck a number of times to [XXX] and [XXX] for the same reasons. The following warmings messages are displayed: FCW/Cruise Control Unavailable Service Required - occurs when using cruise control, Service Electronic Stability Control, Auto Emergency Braking (AEB) Unavailable Service Required, Park Sense Temporarily Unavailable, Service Antilock Brake System, 4WD System Temporarily Unavailable, and Service engine light comes on. Two RAM dealers are saying the issue is the speed sensor, which has been replaced over three times. The RAM dealership had to open an engineer ticket with the manufacture, but the issue is not fixed. The Jacksonville service manger told me I can keep bringing the truck in, but until a different manufacture makes a new speed sensor, the truck will continue to have the same issue. I use the RAM 3500 to pull my RV. Brake system failure put myself and family and others safety at risk while on the road, therefore, I do not drive the truck in fear the brake system will fail and I won't be able to stop 20,000 pounds of truck and RV. The truck is available for inspection, but I am currently in the process of returning the truck under Flordia's Lemon Law. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 25, 2026 · Airbags, Electrical · 65,000 miles · VA

The contact owns a 2023 Ram 3500. The contact stated that while driving or while the vehicle was parked, the air bag warning light was intermittently illuminated. Additionally, the check engine warning light was illuminated, and the seat belt warning light was intermittently illuminated while the seat belt was securely buckled. The messages "Service ESC” and “Service Trailer Brake System” were displayed on the instrument panel. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 65,000.

Filed Jun 21, 2026 · Brakes, Driver assistance · ND

Just driving down the road and abs service, traction control service, 4wd service, automatic emergency brake disabled front and rear sensor service lights come on then go off and come back on later with a check engine light vehicle has less than. 500 miles

Filed May 20, 2026 · Brakes · NE

I had to drive my truck yesterday and this ABS issue is causing my cruise to suddenly stop working, the service engine light to come on and STELLANTIS WILL NOT ISSUE A RENTAL OR PAY FOR THE REMEDY THAT WILL FIX IT PER THEM. They are saying that I need to pay for this and then they MAY or MAY NOT reimburse me. At what point will you start pressing this issue being a SAFETY advocate and US business that is paid to make sure these vehicle manufacturers are fixing these issues? US Customer Care [XXX] > Fri, Mar 20, 5:15 PM to me Hi [XXX] , This is Darell, one of the supervisors in the Stellantis Recall Department. I attempted to reach you by phone, but your voicemail inbox appears to be full, so I am sending this email instead. Regarding your concern about Safety Recall C4B: Hydraulic Control Unit, please note the following: At this time, the official Stellantis recall remedy is not yet available, even though the recall is currently in Phase 4 of 5 toward final remedy release. We also do not have a timeframe for when the final remedy will be issued. However, there is a suitable alternative repair option using parts associated with the recall remedy for the 2017–2018 Ram 3500 Cab Chassis (DD) and Ram 4500 <10K lb. Cab Chassis (DF). Below are the part numbers that may be presented to your dealership. They will be able to determine the appropriate next steps based on the vehicle's condition. Parts Information (Alternative Repair Option) Part No.: 68143491AB Qty.: 1 Part Name: Anti?Lock Brake System (Control) Applicable Models: – 2017–2018 (DF) Ram 3500 <10K lb. Cab Chassis – 2017–2018 (DD) Ram 3500 Cab Chassis Part No.: 04318080AD Qty.: 3 Part Name: Brake Fluid Please understand that this is not a mandatory repair option, but rather an alternative if you prefer not to wait for the official recall remedy. This repair would initially be an out of pocket expense, but you may later file for recall reimbursement. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 14, 2026 · Transmission · MA

While driving transmission just died would only go in reverse. lucky it happened at midnight so there was no traffic and was able to pull over safely. I drove truck home in reverse has I was only about 1000ft from house. Checked transmission fluid was burnt and all black. there was no warning signs check engine light came on just has it happened. I then ordered a aftermarket transmission and had it installed . When old transmission was sent back for core was told under drive and overdrive clutch packs are welded together. Was not brought to dealer because warranty was already up. didn't think to keep codes that populated when check engine light came on there was about six all seemed to do with shift solenoids. I am filling this out in case others have had same issue and maybe its a defect seems like low miles for this to have happened.

Filed May 7, 2026 · Acceleration, Driver assistance · TN

Vehicle sends cluster warnings about Auto Emergency Braking unavailable/inoperable, Electronic Stability Control needs service, Antilock Brake System needs service, Parksense Unavailable, and ultimately the Check Engine indicator illuminates after restarting the vehicle. An error code also is present in the computer, U1412. This has happened twice now in a two week period. These systems are critical to safe operation of he vehicle, especially in emergency braking conditions, and could affect both the operator and the general public if they indeed failed. The vehicle has not been inspected by the manufacturer, yet, and is scheduled for 5/8/2026

Filed Apr 30, 2026 · Acceleration, Brakes · LA

It has been 3 years of our ABS failing due to a Brake HCU not being replaced. Now the engine light comes on due to issues with the Electronic Braking System. We cannot use this to travel due to the cruise control going out as soon as the ABS light goes on which is every 5 minutes. Why is this allowed to be on recall but ‘ no fix has been determined’?!!!! We need answers.

Filed Apr 20, 2026 · Acceleration, Brakes · FL

This is related to the 2025/2026 Ram 3500 U1412 code relating to anti lock brake system. On this date I got an ABS warning light and check engine light. The vehicle would not turn off, was not sure if it was in gear or not, and multiple other lights came on the dash. Vehicle towed to dealership. They said they could not reproduce the error and that all the codes disappeared due to the batteries dying overnight. They replaced both batteries and returned vehicle. Have since had same problem twice more with one requiring towing again. If this problem happens on roadway while being operated it would be very dangerous on roadway.