Ford bulletin SSM 52420
What it saysSome 2023-2024 F-Super Duty vehicles may exhibit an illuminated powertrain malfunction (wrench) indicator with diagnostic trouble codes (DTC) P2122, P2123, P2127, P2128, and/or P2138 stored in the powertrain control… NHTSA’s full summary ↓
Ford filed this with NHTSA as a service bulletin dated Apr 5, 2024, received Apr 25, 2024, about the engine. It names 14 model years (2023–2024). 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 2023-2024 F-Super Duty vehicles may exhibit an illuminated powertrain malfunction (wrench) indicator with diagnostic trouble codes (DTC) P2122, P2123, P2127, P2128, and/or P2138 stored in the powertrain control module (PCM). The vehicle may or may not exhibit a perceived lack of power intermittently. Perform a wiggle test of connector C1580 at the left rear of the engine compartment while the engine is at normal operating temperature. Perform a visual inspection of pins 18 through 29 as well as a terminal fit test using the appropriately sized flex probe. Repair as necessary. Refer to Wiring Diagram Cell 005. If no concerns are found, refer to Workshop Manual (WSM), Section 310-02 for normal diagnostics.
Trouble codes it names: P2122 P2123 P2127 P2128 P2138
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SSM 52420 | Service bulletin | Apr 5, 2024 | 10253556 | PDF, 70 KB |
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: 2023 Ford F-550 SD; 2024 Ford F-550 SD; 2023 Ford F-600 SD; 2024 Ford F-600 SD; 2024 Ford F-650 Incomplete Chassis; 2023 Ford F-650 SD; 2023 Ford F-750 SD; 2024 Ford F-750 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 179 complaints with NHTSA since 2015. 25 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.
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
The contact owns a 2024 Ford F-350 SD. The contact stated while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer, who determined that there was a misfire in cylinders #6 and #8. The dealer later determined that the misfire was in cylinders #6 and #7.
2024 Ford F-350 Super Duty · Engine · filed with NHTSA Mar 12, 2025
Vehicle was being driven by a driver service to be delivered to the home garage after production was completed at the manufacturer. During transit, the operator reported that the low fuel pressure warning light came on immediately followed by flames in the engine compartment
2023 Ford F-450 Super Duty · Engine · filed with NHTSA May 19, 2025
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 group36 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… |
| 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 54738 | Service bulletin | Apr 13, 2026 | Some 2023-2025 Escape 1.5L/F-Super Duty/Transit vehicles may exhibit a lack of cooling from the heating, ventilation, and air conditioning… |
| 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 SSM 52420 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 SSM 52420 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 SSM 52420 cover?
The manufacturer filed it against 14 model years: 2024 Ford F-250 Super Duty, 2023 Ford F-250 Super Duty, 2024 Ford F-350 Super Duty, 2023 Ford F-350 Super Duty, 2024 Ford F-450 Super Duty, 2023 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.