2021 Ford F-350 SD Technical Service Bulletins

240 technical service bulletins (TSBs) are on record for the 2021 Ford F-350 SD. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11038166Oct 6, 2026Other or unknown, Transmission and drivetrain. 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…
• 11037979Oct 1, 2026Transmission and drivetrain, Other or unknown. 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
• 11035635Jul 28, 2026Other or unknown, Engine. 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 Engine Nitrogen Oxide (NOx) Sensor Replacement, If Required After Dealer Evaluation Reference: Emissions Recalls 22E02, 22E04, 23E01, and 25E09
• 11034010Jun 19, 2026Engine, Other or unknown. 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 bolts AL3Z-6379-BA from the parts list as these bolts are in kit LC3Z-6781-A, update the claim quantity of the part number W709771-S440 to 9 pieces (F-650/F750-Engine Replacement), W706447-S437 and W715068-S437 to 4 pieces, W712861-S439 to 8 pieces(F-Super Duty Pickup And Chassis…
• 11032694May 6, 2026Transmission and drivetrain. 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…
• 11031263Apr 2, 2026Electrical system, Lane departure. 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…
• 11030282Mar 25, 2026Other or unknown, Back-over prevention (rear camera), Lane departure. Advance Notice – Customer Satisfaction Program 25N17 Certain 2015-2025 Model Year Multiple Vehicle Lines Rear View Camera Replacement If Required After Dealer Evaluation
• 11030797Mar 20, 2026Engine. Some 2021-2026 F-150 vehicles equipped with a 5.0L/5.2L engine, 2021-2025 F-Super Duty/F-53 Motorhome/F59 Commercial Stripped Chassis vehicles equipped with a 6.8L/7.3L engine and 2021-2025 E-Series/F-650/F-750 vehicles equipped with a 7.3L engine may exhibit a rattle/scraping noise upon startup that may remain after the engine is running. Workshop Manual (WSM),
• 11029923Mar 5, 2026Transmission and drivetrain. 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).
• 11029052Feb 24, 2026Other or unknown, Electrical system, Body and structure. Ford and Lincoln vehicles equipped with wired keyless entry keypad systems and accessory wireless keyless entry keypad systems may or may not come with a wallet card containing the master code. Unlike the integrated wired keypad, the accessory wireless keypad master code cannot be retrieved from the vehicle using a diagnostic scan tool or from the label printed on the body control module (BCM).
• 11029595Feb 17, 2026Electrical system. Some 2019-2024 Ford and Lincoln vehicles equipped with SYNC3 may experience various connectivity concerns with The Ford App Lincoln App including but not limited to: missing activation prompt pop-upon the vehicle's center display screen when attempting to activate vehicle through The Ford App Lincoln App, incorrect location global positioning system GPS reported through The Ford App Lincoln App, problems with…
• 11029081Feb 17, 2026Transmission and drivetrain. For 20172026 vehicles equipped with a 10R transmission, a revision to the Road Testing Vehicle procedure has been made in the WSM, located in Section 307-01 > Diagnosis and Testing. This updated procedure improves the diagnosis of customer reported transmission concerns and aids in locating the proper root cause.
• 11027144Dec 16, 2025Brakes. Some 2017-2026 F-Super Duty vehicles may exhibit a pull/drift condition during braking. This may be due to the brake pads needing to be broken in. Repeated, heavy brake applications may assist to resolve the pull/drift condition. The Workshop Manual, Section 206-00 Symptom Chart for vehicle pulls or drifts during braking has been updated to reflect this information.
• 11026928Dec 2, 2025Other or unknown. Special Field Action 25L02 Certain 2017-2024 Model Year California Emissions-Certified Vehicles Transmission Control Assembly Reimbursement
• 11025854Nov 26, 2025Engine, Transmission and drivetrain. This article supersedes TSB 25-2322 to update the Service Procedure, Labor Operations and Parts List. Some of the vehicles listed in the Model statement above may exhibit an upper engine ticking or tapping noise at idle. Customers may also report experiencing rough engine performance, engine misfire, or a malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0301-P0308 in the powertrain control…
• 11025526Nov 10, 2025Other or unknown, Transmission and drivetrain, Engine. Some 2021-2025 Expedition/Navigator/F-150/F-Super Duty/F-53 Motorhome/F59 Commercial Stripped Chassis/F-650/F-750/Transit vehicles equipped with a 2.7L/3.5L (non hybrid)/6.8L/7.3L engine and 2021-2026 E-Series may exhibit a rattle/scraping noise from the bellhousing area on start-up. Workshop Manual (WSM), Section 303-00 Engine System - General Information > Diagnosis and Testing and 303-06 > Starting System has…
• 11025529Nov 6, 2025Transmission and drivetrain, Electrical system. 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…
• 11024900Oct 29, 2025Transmission and drivetrain. Some 2021-2025 F-150 vehicles equipped with a 5.0L/5.2L engine, 2021-2025 F-Super Duty/F-53 Motorhome/F59 Commercial Stripped Chassis vehicles equipped with a 6.8L/7.3L engine and 2021-2026 E-Series/F-650/F-750 vehicles equipped with a 7.3L engine may exhibit a rattle/scraping noise upon startup that may remain after the engine is running. This may be due to the starter motor drive gear not retracting after…
• 11024532Oct 24, 2025Other or unknown, Body and structure. Some 2018-2025 F-150 and 2018-2026 F-Super Duty vehicles equipped with a tailgate step may exhibit a step assembly that binds/will not open or opens/pops up while driving. This could be due to an incorrect adjustment of the tailgate step assembly. Before replacing any components for this concern, follow the revised Tailgate Step Adjustment procedure in Workshop Manual (WSM), Section 501-04.
• 11024526Oct 21, 2025Electrical system, Lane departure. Some 2020-2025 various 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…
• 11024021Oct 4, 2025Engine. Some 2021-2025 Expedition/Navigator/F-150/F-Super Duty/F-53 Motorhome/F59 Commercial Stripped Chassis/F-650/F-750/Transit vehicles equipped with a 2.7L,3.5L EcoBoost (non-hybrid), 3.5L Cyclone, 6.8L or 7.3L engine, may exhibit a rattle/scraping noise from the bellhousing area on start-up. Workshop Manual (WSM), Section 303-00 Engine System - General Information > Diagnosis and Testing and 303-06 > Starting System…
• 11023851Sep 24, 2025Other or unknown, Engine. Certain 2017 and 2020-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine - Emission Control Information Label Update
• 11023203Sep 12, 2025Fuel system. Some 2019-2026 F-Super Duty vehicles equipped with a 6.7L engine may require various repairs and/or maintenance to the fuel system where quick release couplings are utilized, such as the secondary fuel filter. The Workshop Manual (WSM), Section 310-00 > General Procedures > Quick Release Coupling has been updated to include videos and instructions of proper disconnect/connect steps involving the Type 27 quick…
• 11022355Aug 23, 2025Engine, Other or unknown. Certain 2011-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine - Emission Control Information Label Update for Qualified Vehicles
• 11022379Aug 22, 2025Other or unknown, Engine. Certain 2017 and 2020-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine - Emission Control Information Label Update
• 11022380Aug 12, 2025Other or unknown, Engine. Certain 2020-2023 Model Year Multiple Vehicle Line Trucks Equipped with Diesel Engines - Particulate Matter (PM) Sensor Reimbursement
• 11021803Aug 7, 2025Electrical system, Other or unknown. Various 2019-2024 Ford and Lincoln vehicles equipped with SYNC 3 may experience a partially or fully black center display screen at start-up using Apple CarPlay or Android Auto. This does not affect rear camera operation. This may be due to interference from the phone being connected into the media hub using a universal serial bus (USB) cable during SYNC system boot up. To correct his condition, advise the customer…
• 11020894Jul 18, 2025Transmission and drivetrain, Electrical system. This article supersedes TSB 25-2200 to update the parts list to add the new camshaft and tappet service kit and add F-650/F-750. Some of the vehicles listed in the Model statement above may exhibit an upper engine ticking or tapping noise at idle. Customers may also report experiencing rough engine performance, engine misfire, or a malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0301-P0308 in…
• 11019659Jun 11, 2025Transmission and drivetrain, Electrical system. This article supersedes TSB 23-2076 to update the powertrain control module (PCM) software level addressing the condition. Some of the vehicles listed in the Model statement above may exhibit an illuminated malfunction indicator lamp (MIL) with cylinder injection pulse offset diagnostic trouble codes (DTC) P2B11, P2B13, P2B15, P2B17, P2B19, P2B1B, P2B1D, and/or P2B1F stored in the powertrain control module (PCM)…
• 11019495Jun 6, 2025Transmission and drivetrain. Some 2020-2025 F-Super Duty vehicles equipped with a 10R140 automatic transmission may exhibit a delayed engagement into drive and/or reverse on initial start-up. The condition may occur at times after sitting overnight or for a couple of days. This may be due to the transmission fluid draining back from the torque converter. This is a normal characteristic of the 10R140 transmission and has no effect on…
• 11018524May 19, 2025Engine, Transmission and drivetrain. Some of the vehicles listed in the Model statement above may exhibit an upper engine ticking or tapping noise at idle. Customers may also report experiencing rough engine performance, engine misfire, or a malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0301-P0308 in the powertrain control module (PCM). This may be due to camshaft and/or valve tappet having excess wear within the engine assembly.
• 11018521May 13, 2025Transmission and drivetrain, Engine. 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.
• 11019259May 10, 2025Other or unknown. Certain 2018-2024 model year various vehicles — update sync software
• 11017163Apr 17, 2025Other or unknown. Some 2020-2023 F-Super Duty vehicles equipped with a 10R140 transmission may exhibit harsh or delayed engagement/shift concerns. Refer to Workshop Manual (WSM), Section 307-01 > Diagnosis and Testing for normal diagnostics. The WSM has been updated with all information from previously published articles related to this concern.
• 11016083Mar 26, 2025Other or unknown. Some of the vehicles listed in the Model statement above may exhibit an 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.
• 11016244Mar 13, 2025Other or unknown. Certain 2020-2021 Model Year P558 Super Duty Vehicles Super Duty Trucks with Event Data Recorder (EDR) Disabled
• 11014427Feb 18, 2025Other or unknown. Some 2020-2022 F-Super Duty vehicles equipped with a 6.7L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) U3012 only stored in the powertrain control module (PCM).
• 11013558Jan 31, 2025Other or unknown. Some 2020-2025 F-Super Duty vehicles equipped with a 6.7L engine may exhibit an illuminated malfunction indicator lamp (MIL) with cylinder injection pulse offset diagnostic trouble codes (DTC) P2B11, P2B13, P2B15, P2B17, P2B19, P2B1B, P2B1D, and/or P2B1F stored in the powertrain control module (PCM) when operating at elevations greater than 2500 feet (762 meters)
• 11013142Jan 24, 2025Other or unknown. Some 2020-2022 F-Super Duty vehicles equipped with a 6.7L engine may exhibit an illuminated malfunction indicator lamp (MIL), lack of power, and/or excessive turbo noise during operation, with diagnostic trouble codes (DTC) P003A, P0045, P0046, P0047, P0048, P0234, P0237, P0238, P0299, P132A, P226C, P2263, P2564, P2565, P2598, P259E, and/or P259F stored in the powertrain control module.
• 11013133Jan 17, 2025Other or unknown. Some 2020-2022 F-Super Duty vehicles equipped with a 6.7L engine and rear wheel drive (RWD) may require replacement of the transmission assembly for various reasons.
• 11011941Dec 16, 2024Other or unknown. Some 2017-2025 F-Super Duty vehicles may exhibit a pull/drift condition during braking.
• 11011936Dec 12, 2024Other or unknown. Some 2020-2021 F-Super Duty vehicles which have received a seat control module-G (SCMG) and/or seat control module-H (SCMH) software update using the Ford Diagnosis and Repair System (FDRS) scan tool may set DTCs U024B and/or U024C in the auxiliary protocol interface module (APIM).
• 11012217Dec 4, 2024Other or unknown. Certain 2018 - 2024 Model Year Various Vehicles Update SYNC Software
• 11011019Nov 12, 2024Other or unknown. In affected vehicles, the Variable Displacement Oil Pump (VDOP) delivers oil to the engine at low pressure/capacity during idle conditions. Routine occurrences of prolonged idle time may result in excess wear to the engine camshaft lobes and valve tappet surfaces due to reduced lubrication. Over time, the engine may progressively run rough due to cylinder misfire. Additionally, customers may hear engine tapping…
• 11008948Oct 10, 2024Other or unknown. While performing a transmission repair on some 2012-2024 Ford and Lincoln vehicles, a transmission seal kit may be on backorder due to supply chain interruptions. While performing a transmission repair on some 2012-2024 Ford and Lincoln vehicles, a transmission seal kit may be on backorder due to supply chain interruptions.
• 11008373Sep 11, 2024Engine. In affected vehicles, the Variable Displacement Oil Pump (VDOP) delivers oil to the engine at low pressure/capacity during idle conditions. Reason for supplement: software now available/additonal technician information
• 11007943Sep 4, 2024Other or unknown. 018-2024 F-150/F-Super Duty - Tailgate Step Binds/Will Not Open Or Opens/Pops Up While Driving
• 11006862Aug 23, 2024Other or unknown. Some 2019-2024 Ford and Lincoln vehicles equipped with a telematics control unit module (TCU) may exhibit the Location toggle button in the Connectivity setting menu grayed out with an inability to switch it off.
• 11006767Aug 22, 2024Transmission and drivetrain. This article supersedes TSB 22-2087 to update the Part List. Some 2020-2022 F-Super Duty vehicles equipped with a 10R140 automatic transmission may exhibit harsh reverse to drive engagements without diagnostic trouble codes (DTCs). This may be due to sticking valves in the main control valve body or suspect input shaft seals (F9) and the output shaft seals (F10).
• 11005994Jul 31, 2024Fuel system. Some 2020-2022 F-Super Duty pickup vehicles equipped with a 6.7L engine, 175 inch wheelbase, and built on or before 23-Sep-2021 may exhibit a thump/whine/knock noise from the midship fuel tank at idle or during key on, engine off (KOEO) after performing TSB 21-2057. The noise may be more pronounced at fuel levels at or below 1/4 tank. This may be due to the fuel pump

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