Ford bulletin TSB 25-2420
What it saysSome of the vehicles listed in the Model statement above built with minor feature code AAZNQ or AAZNS (gross vehicle weight rating ÝGVWR¨ 9,900 lb. or 10,000 lb. pounds) may exhibit an incorrectly illuminated… NHTSA’s full summary ↓
Ford filed this with NHTSA as a service bulletin dated Sep 10, 2025, received Sep 16, 2025, about the engine. It names 8 model years (2024–2025). 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 communicationSome of the vehicles listed in the Model statement above built with minor feature code AAZNQ or AAZNS (gross vehicle weight rating ÝGVWR¨ 9,900 lb. or 10,000 lb. pounds) may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P20EE stored in the powertrain control module (PCM). This may be due to the calibration in the PCM. This condition does not affect vehicle drivability or durability. To confirm a vehicle is built with a certain minor feature code, review the build information by double-clicking the vehicle identification number (VIN) in the upper left corner in the Professional Technician System (PTS).
Trouble codes it names: P20EE
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| TSB 25-2420 | Service bulletin | Sep 10, 2025 | 11023139 | PDF, 110 KB |
What the document itself lists
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 252420A | 2024-2025 F-250 GVWR 10,000 lb. And Below-6.7L: Retrieve DTCs And Reprogram The… | 0.6 hrs |
Read by machine from the document NHTSA serves (1 page), read Sep 30, 2026. A part number is shown only where it matches Ford’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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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: 2024 Ford F-550 SD; 2025 Ford F-550 SD.
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 6 model years this bulletin names have filed 127 complaints with NHTSA since 2015. 30 of them name Power Train, 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.
The contact owns a 2024 Ford F-350. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly downshifted. There was no warning light illuminated. The vehicle was taken to the dealer but was not diagnosed or repaired. The dealer informed the contact that a software update had been completed on the TCM.
2024 Ford F-350 Super Duty · Power Train · filed with NHTSA Jul 16, 2025 · ODI 11674055
Less than 4000 miles- first transmission failed while pulling a large trailer- ford replaced the transmission and the new transmission, only 200 miles later did the same thing when pulling a trailer, up hill. It throws the transmission into 10th gear and you loose all power, Check engine light comes on and it slams back into 4th gear.
2025 Ford F-450 Super Duty · Power Train · filed with NHTSA Sep 3, 2025 · ODI 11684755
The contact owned a 2024 Ford F-450 SD. The contact stated that while his fiancée was driving with cruise control set to 57 MPH, there was an abnormally strong smoky odor inside the cabin of the vehicle. No warning light was illuminated. The driver pulled over to the side of the road and there were flames coming from the engine bay.
2024 Ford F-450 Super Duty · Engine · filed with NHTSA Aug 18, 2026 · ODI 11757734
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 group38 other manufacturer communications filed against these Ford models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Ford list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26N03 | Other | Aug 26, 2026 | Customer Satisfaction Program 26N03 Certain 2017-2019 Model Year Super Duty Vehicles w/ 6.7L Diesel Engines Diesel Particulate Filter Replac… |
| 26E02 | Other | Aug 26, 2026 | NEW VEHICLE DELIVERY HOLD Emissions Recall 26E02 Certain 2016-2019 F-650 - 750 and 2017-2019 F-350 - 550 Vehicles Equipped With 6.7L Diesel… |
| 25M01 | Other | Jul 28, 2026 | Customer Satisfaction Program 25M01 Certain 2021 Model Year F-150 3.0L Diesel Engine and 2020-2022 Model Year Super Duty with 6.7L Diesel En… |
| 25N14 | Other | Jun 24, 2026 | Certain 2022 Model Year F-250 - F-600 with 6.7L Diesel Engines One-Time Replacement for Diesel Particulate Filter Assembly Failures, If Re… |
| 25E09 | Emissions | Jun 24, 2026 | NEW VEHICLE DEMONSTRATION / DELIVERY HOLD Emissions Recall 25E09 Certain 2022 Model Year F-250 - F-600 Vehicles with 6.7L Engines Powertrain… |
| TSB 26-2256 | Service bulletin | Jun 19, 2026 | This article supersedes TSB 25-2572 to update the Parts List to correct the part number LC3Z-6006-L to LC3Z-6781-A, remove the flex plate bo… |
| 22N05-S3 | Service bulletin | Jun 5, 2026 | Customer Satisfaction Program 22N05 - Supplement #3 Certain 2022 Model Year Super Duty with 6.7L Diesel Engine One-Time Replacement for Dies… |
| SSM 54690 | Service bulletin | Mar 26, 2026 | Some 2013-2016 Super Duty vehicles equipped with a 6.7L diesel engine and 2015-2019 Transit vehicles equipped with a 3.2L diesel engine may… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Ford, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Ford TSB 25-2420 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 TSB 25-2420 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 TSB 25-2420 cover?
The manufacturer filed it against 8 model years: 2025 Ford F-250 Super Duty, 2024 Ford F-250 Super Duty, 2025 Ford F-350 Super Duty, 2024 Ford F-350 Super Duty, 2025 Ford F-450 Super Duty, 2024 Ford F-450 Super Duty and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.