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Service bulletin TSB 25-2549

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 id11025529
Published by NHTSA2025-11-13
Manufacturer's numberTSB 25-2549
Manufacturer's date2025-11-06
NHTSA componentPOWER TRAIN; ELECTRICAL SYSTEM

NHTSA's summary

This article supersedes TSB 25-2119 to update the vehicles affected, parts list, and Service Procedure. Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0420 and/or P0430 stored in the powertrain control module (PCM). This may be due to the software in the PCM. This condition does not affect vehicle drivability or durability.

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

Electrical system, Transmission and driveline

Trouble codes named

P0420, P0430

Vehicles listed
FORD F-250 SD2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
FORD F-350 SD2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
FORD F-450 SD2021, 2022 (the catalog's model; the bulletin names a series or trim of it)
FORD F-550 SD2021, 2022 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
26V1040002026-02-20. EXTERIOR LIGHTING:TAIL LIGHTS; ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL
25V1320002025-02-28. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL
23V7580002023-11-09. WHEELS:LUGS/NUTS/BOLTS/STUDS; POWER TRAIN:AXLE HUBS
22V1930002022-03-25. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL
20220742022-02-17. Powertrain
22V0870002022-02-16. STRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS; POWER TRAIN:DRIVELINE:DRIVESHAFT
20214372021-07-16. Powertrain
21V5360002021-07-15. POWER TRAIN:AXLE ASSEMBLY
21V3900002021-05-25. POWER TRAIN:AXLE HUBS

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 26-2375 v22026-10-13. Service bulletin. NOTE: This bulletin has been updated, refer to the change log at the bottom for details. Issue: Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: • Poor shift quality • Illuminated powertrain malfunction (wrench) indicator with DTCs P2704 and P0771 stored in the PCM / TCM . This may be due to a calibration in the TCM and/or wear between the input shaft and the E clutch hub causing theinput shaft O-rings to become damaged resulting in an open E clutch circuit. Action: For vehicles that meet all of the criteria in the Issue and Model statements, follow the Service Procedure toreprogram the PCM / TCM and/or replace the E clutch hub and input shaft O-rings
SSM 552182026-10-06. Service bulletin. For 20202026 vehicles equipped with the 10R140 transmission, a new Transmission Clutch Circuit Leak Test has been introduced in the Ford Diagnosis and Repair System (FDRS). This test utilizes the pressure and vacuum transducer (PVT) when available. Workshop Manual (WSM) updates related to this diagnostic procedure are planned for release in Q4 2026. The new test improves the accuracy of detecting leaks within transmission fluid circuits and replaces the previous air check method. The previous air check procedure has been shown to produce a high rate of false positives, which may lead to unnecessary repairs when no actual leak is present. Accordingly, the air check procedure is not to be used for diagnosing internal transmission hydraulic leaks or as justification for transmission replacement.
TSB 26-2088 v22026-10-05. Service bulletin. This bulletin supersedes 24-2249. Reason for update: update the claim quantity of the torque converter nuts, part number and claim quantity of the front support assembly bolt washers, and part number change of the fluid pan from the Parts List. Reissued 01-Oct-2026 - Added LC3Z-7G091-B to the part list
TSB 26-23752026-08-19. Service bulletin. This article supersedes TSB 26-2050 to increase the labor operation allowance of labor operations A and B. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Poor shift quality Illuminated powertrain malfunction (wrench) indicator with diagnostic trouble codes (DTC) P2704 and P0771 stored in the PCM/TCM. This may be due to a calibration in the TCM and/or wear between the input shaft and the E clutch hub causing the input shaft O-rings to become damaged resulting in an open E clutch circuit. Additional model information: 6.7L Diesel Engine 2022-2024 F-550 or F-600 F-Super Duty vehicles built on or before 15-May-2024 with over 5,000 miles (8,000km)
SSM 550312026-07-28. Service bulletin. Some 2021-2026 Ford/Lincoln vehicles may exhibit various symptoms including but not limited to the auto start/stop system not operating as intended with a "Check Charging System" message in the instrument panel cluster (IPC) while the charging system is operating properly with no charging related diagnostic trouble codes (DTC) stored. This may be due to someone using an aftermarket programmer to change the body control module (BCM) configuration to disable the auto start/stop system or perform other unsupported programming modifications. To correct this condition on F-150 and Bronco vehicles, download and run the Ford Diagnosis and Repair System (FDRS) application titled "BCM-Charging System Configuration Correction". Running this application will determine if the BCM configuration was modified by the customer and if so, provide the option to return the configuration back to factory settings. For other vehicle models exhibiting concerns related to unsupported aftermarket BCM programming, submit a Technical Support Request (TSR) requesting support to revert the BCM configuration
TSB 26-22162026-05-14. Service bulletin. This bulletin supersedes 25-2549. Reason for update: To add 2020 model year chassis cab vehicles. Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0420 and/or P0430 stored in the powertrain control module (PCM). This may be due to the software in the PCM. This condition does not affect vehicle drivability or durability.
23E01 S12026-05-05. Emissions. Emission Recall 23E01 - Supplement #1 2021 Model Year F-150, 2022 Model Year Super Duty and 2023 Model Year F-650 / F-750 Truck Vehicles Equipped with Diesel Engines Powertrain Control Module Reprogramming
SSM 547202026-04-10. Service bulletin. Various 2020-2026 Ford and Lincoln vehicles equipped with blind spot information system (BLIS) may experience an inoperative blind spot monitoring with a "Blind Spot System Fault" message displayed in the instrument panel cluster (IPC). This may also be accompanied by diagnostic trouble codes (DTCs) B118C:11 and/or B118C:15 stored in the driver door module (DDM), and/or B118D:11 and/or B118D:15 stored in the passenger door module (PDM). This may be due to the wiring connector from the mirror to the BLIS module. If diagnostics lead to an internal mirror wiring harness fault, a new lower level BLIS light pigtail is now released for service. It is not necessary to replace the exterior mirror assembly. Use part number SC3Z-14A411-B to resolve the concern.
TSB 26-20882026-03-10. Service bulletin. This article supersedes TSB 24-2249 to update the claim quantity of the torque converter nuts, part number and claim quantity of the front support assembly bolt washers, and part number change of the fluid pan from the Parts List. Some of the vehicles listed in the Model statement above may exhibit a harsh reverse to drive engagements with no diagnostic trouble codes (DTC). This may be due to sticking valves in the main control valve body and/or damaged input shaft seals (F9), and the output shaft seals (F10). Additional model information: Built On Or Before 13-Dec-2021 10R140 Automatic Transmission
25N102026-03-05. Other. Certain 2017-2025 F-450 – F-600 Super Duty Chassis Cab Upfitted with an Aerial Bucket Frame Rail Crack