Ram bulletin 111478
Ram filed this with NHTSA as a service bulletin dated May 21, 2026, received May 28, 2026, about the engine. It names 32 model years (2019–2026). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationRADIATOR - ENGINE COOLING
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 111478 | Service bulletin | May 21, 2026 | 11032990 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2019 Ram 4500; 2020 Ram 4500; 2021 Ram 4500; 2022 Ram 4500; 2023 Ram 4500; 2024 Ram 4500; 2025 Ram 4500; 2026 Ram 4500; 2019 Ram 5500; 2020 Ram 5500; 2021 Ram 5500; 2022 Ram 5500; 2023 Ram 5500; 2024 Ram 5500; 2025 Ram 5500; 2026 Ram 5500.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 16 model years this bulletin names have filed 1,474 complaints with NHTSA since 2015. 272 of them name Engine — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2019 Ram 3500, the 17 owners who gave an odometer reading for Engine reported it at a median of 75,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
For thanksgiving I was driving home from a trip to california about 800 miles away from home, on a merging lane I stepped on the gas to clear lane for a emerging semi trailer I was traveling around 65 MPH as I did that I got a warning message on my dashboard to service exhaust system then lost all power from my vehicle from 65 to 35 on…
2019 Ram 3500 · Engine · filed with NHTSA Jan 7, 2021
Purchased the truck new with 25 miles on it from the dealer. Within the first 2000 miles, I had a message pop up that said "Service Exhaust System See Dealer". I took it in to the dealer, they said it showed a random emission related code had popped up but was not currently active, so their recommendation was to clear it and see if it…
2026 Ram 3500 · Engine · filed with NHTSA Dec 23, 2025
Truck died in traffic. Lost all power steering, brakes, etc. almost caused a multiple vehicle accident, and left me stranded in the middle of traffic until I could get assistance to move. There was no warning or notice before the truck just quit working. A warning light came on after the truck died and stated "exhaust system failure.
2020 Ram 2500 · Engine · filed with NHTSA Mar 8, 2021
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the engine
Source: same model, same component group58 other manufacturer communications filed against these Ram models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Ram list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 25-004-26 | Service bulletin | Sep 23, 2026 | Exhaust Gas Temperature (EGT) Sensor Water Intrusion ’s VIN MUST be listed in VIP or your RSU VIN list. NOTE: This bulletin applies to ● The… |
| 9100922 | Service bulletin | Sep 15, 2026 | SENSOR Exhaust Temperature If this sensor is being replaced due to an early-life P242B pending fault code, clear the fault code and perform… |
| 07-006-26 | Service bulletin | Sep 1, 2026 | Engine Overheat Customers may comment on the following: SYMPTOM: ● Vehicle overheating. ● Temperature gauge is reading hot. ● Overheat symbo… |
| 114255 | Service bulletin | Aug 26, 2026 | RADIATOR - ENGINE COOLING |
| 114254 | Service bulletin | Aug 26, 2026 | RADIATOR - ENGINE COOLING |
| 9100882 | Service bulletin | Aug 17, 2026 | PULLEY Fan If replacing 68209745AA, also replace 68723388AA, 05086958AB, and 68000833AD. Retain bolts, mark each with its original location… |
| 18-038-26 REV. A | Service bulletin | Jul 29, 2026 | Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle exh… |
| 113744 | Service bulletin | Jul 29, 2026 | SENSOR - TURBOCHARGER SPEED |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Ram, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Ram 111478 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 111478 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 111478 cover?
The manufacturer filed it against 32 model years: 2026 Ram 2500, 2025 Ram 2500, 2024 Ram 2500, 2023 Ram 2500, 2022 Ram 2500, 2021 Ram 2500 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.