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Service bulletin SSM 53991

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11020088
Published by NHTSA2025-07-02
Manufacturer's numberSSM 53991
Manufacturer's date2025-07-02
NHTSA componentUNKNOWN OR OTHER; ENGINE

NHTSA's summary

Some 2025 Mustang GTD vehicles may set diagnostic trouble code (DTC) U0420:82 in the image processing module a (IPMA) during a diagnostic self-test. This may be due to the module's DTC sensitivity during vehicle key-on/start-up. Replacement or reprogramming of the IPMA module may not resolve this condition. If no other DTCs are present, no warning indicators are illuminated while the engine is running, and no noticeable symptoms are present, no additional diagnostics or service is recommended for this condition at this time. Inform customers engineering is currently working on a solution for this condition that is expected in Q4 2025. Monitor Professional Technician System (PTS) for additional information and schedule service appointments for customers once the repair becomes available. If this condition is encountered, use the "Submit Global Concern Report (GCR)" link at the upper right of the Vehicle ID tab to submit a report and reference this article number in the report.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Trouble codes named

U0420

Vehicles listed
FORD MUSTANG2025

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20260942026-03-03. Engine
26V1220002026-03-03. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)
20255492025-10-11. Engine

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
TSB 26-22102026-06-05. Service bulletin. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: * Engine misfire condition * Illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0301, P0302, P0303, and/or P0304 stored in the powertrain control module (PCM)
SSM 545932026-02-27. Service bulletin. Some 2024-2025 F-150, Expedition/Navigator, Escape/Corsair, Bronco, Explorer, Mustang, Maverick vehicles equipped with a 1.5/2.0/2.3/3.5L EcoBoost engine and built on 01-Oct-2024 and through 31-May-2025 may exhibit an extended crank condition, strong fuel smell in the engine oil, high engine oil level and/or may have various drivability diagnostic trouble codes (DTCs) stored in the powertrain control module (PCM) with an illuminated malfunction indicator lamp (MIL). This may be due to an internal fuel leak of the high-pressure fuel pump causing fuel to enter the crankcase and reduce fuel pressure in the direct injection fuel rail. Diagnose this condition using Pinpoint Test HP located in Workshop Manual (WSM), Section 303-04. If no DTCs are stored in the PCM, proceed from Step HP1 to Step HP5 and continue testing. Repair as necessary outside of this article. For claiming, if high-pressure fuel pump replacement is required, use causal part number 9D376 and labor operation code 9543A. If the root cause is identified as anything other than the fuel injection pump, claim the repair outside of this article.
25H032025-10-03. Other. Harvest Program 25H03 Certain 2024 - 2025 Model Year Bronco, Bronco Sport, Corsair, Escape, Explorer, Maverick, Mustang, and Ranger Vehicles with 1.5L, 2.0L, or 2.3L Engine Spark Plug Replacemen
25H032025-09-02. Other. Certain 2024 - 2025 Model Year Bronco, Bronco Sport, Corsair, Escape, Explorer, Maverick, Mustang, and Ranger Vehicles with 1.5L, 2.0L, or 2.3L Engine Spark Plug Replacement
25P202025-08-02. Other. Certain 2025 Model Year Bronco, Explorer, Mustang, and Ranger Vehicles Engine Coolant Temperature Sensor Replacement On all affected vehicles, the Engine Coolant Temperature sensor (ECT) may have a poor solder joint internally, causing a Diagnostic Trouble Code (DTC) to set against the sensor for an open circuit and the check engine light to illuminate
SSM 539742025-07-02. Service bulletin. Some 2024-2025 Mustang vehicles equipped with a 2.3L EcoBoost engine may require removal of the air conditioning compressor belt due to various concerns. Workshop Manual (WSM), Section 303-05 has been updated with improved removal and installation service procedure steps.
SSM 539732025-07-02. Service bulletin. Some 2021-2024 Edge/Nautilus, 2021-2025 Bronco/Bronco Sport/E-Series/Escape/Corsair/Expedition/Navigator/Explorer/Aviator/F-150/F-Super Duty/Mustang/Ranger, and 2022-2025 Maverick vehicles may require an A/C compressor clutch assembly replacement be performed for various concerns. Workshop Manual (WSM), Section 412-00 Removal and Installation has been updated to eliminate the need to remove and install the A/C compressor to change out the A/C Compressor clutch assembly.
SSM 539712025-07-02. Service bulletin. Some 2023-2025 Escape vehicles equipped with a 1.5L/2.0L EcoBoost engine, 2023-2025 Corsair vehicles equipped with a 2.0L EcoBoost engine, 2024-2025 Nautilus vehicles equipped with a 2.0L EcoBoost engine, 2024-2025 Mustang vehicles with a 2.3L EcoBoost engine, and 2025 Bronco/Explorer/Ranger vehicles equipped with a 2.3L EcoBoost engine may exhibit an engine misfire condition with diagnostic trouble codes (DTC) P0301, P0302, P0303 and/or P0304 set in the powertrain control module (PCM). This may be due to the spark plugs and/or ignition coils. To correct the condition, refer to Workshop Manual (WSM), Section 303-07 for normal diagnostics.
SSM 537642025-05-21. Service bulletin. Some 2020 Continental, 2020-2024 Edge/Nautilus, 2020-2025 Explorer/Aviator/Escape/Corsair/F-150/F-Super Duty/Ranger/Transit/E-Series, 2021-2025 Bronco, and 2022-2025 Maverick vehicles may require an engine cooling system flush to be performed for various concerns. Workshop Manual (WSM), Section 303-03 has been updated to eliminate the need to remove and install the radiator assembly to perform a radiator flush.