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Service bulletins for the 2021 Ford F-550

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.

237 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
25M012026-08-04. Other. ENGINE; UNKNOWN OR OTHER. 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
TSB 26-22562026-06-22. Service bulletin. ENGINE; UNKNOWN OR OTHER. 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 Cab-Engine Replacement) / 8 pieces (F-53 Motorhome/F-59 Stripped Chassis Cab/F-650,F750 Engine Replacement) / W714286-S442 to 4 pieces (F-Super Duty Pickup And Chassis Cab-Camshaft and Tappet Repair / F-Super Duty Pickup And Chassis Cab-Engine Replacement), include LC3Z-6020-A for the Engine replacement lists, include 1 fuel injector seal kit to the Camshaft and Tappet repair lists, include 4 pieces of W520114-S440 to the E Series-Camshaft and Tappet Repair list, and update the engine oil part numbers XO-5W30-Q1SP and CXO-5W30-LSP6. 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 ro
TSB 25-25722025-12-01. Service bulletin. POWER TRAIN; ENGINE. 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 module (PCM). This may be due to camshaft and/or valve tappet having excess wear within the engine assembly.
SSM 543632025-11-13. Service bulletin. UNKNOWN OR OTHER; POWER TRAIN; 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 been updated to address this condition. Additionally, WSM, Section 303-01 > Removal and Installation > Engine to Transmission Spacer Plate has been added to address this condition. Refer to the revised WSM sections for normal diagnosis.
SSM 542692025-10-08. Service bulletin. 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 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 has been updated. Additionally, WSM, Section 303-01 > Removal and Installation > Engine to Transmission Spacer Plate has been added to address this condition. Refer to the revised WSM sections for normal diagnosis.
24L052025-10-03. Other. ENGINE; UNKNOWN OR OTHER. Certain 2011-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine - Emission Control Information Label Update for Qualified Vehicles
24L042025-10-03. Other. UNKNOWN OR OTHER; ENGINE. Certain 2017 and 2020-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine - Emission Control Information Label Update
24L032025-09-03. Other. ENGINE; UNKNOWN OR OTHER. Certain 2020-2023 Model Year Multiple Vehicle Line Trucks Equipped with Diesel Engines - Particulate Matter (PM) Sensor Reimbursement
24L042025-09-03. Other. UNKNOWN OR OTHER; ENGINE. Certain 2017 and 2020-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine - Emission Control Information Label Update
24L052025-09-03. Other. ENGINE; UNKNOWN OR OTHER. Certain 2011-2022 Model Year Super Duty Vehicles Equipped with 6.7L Engine - Emission Control Information Label Update for Qualified Vehicles
SSM 539732025-07-02. Service bulletin. POWER TRAIN; ENGINE. 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.
TSB 25-22002025-05-21. Service bulletin. ENGINE; POWER TRAIN. 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.
SSM 537642025-05-21. Service bulletin. POWER TRAIN; 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.
24B27 S32024-10-03. Service bulletin. ENGINE. 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
24B27 S12024-07-02. Service bulletin. ENGINE. Certain 2020-2024 Super Duty and 2021-2025 Model Year Econoline Equipped With a 6.8L or 7.3L Gasoline Engine Powertrain Control Module (PCM) Software Update 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 noises and the Check Engine Light (CEL) may illuminate
SSM 523352024-03-20. Service bulletin. ENGINE AND ENGINE COOLING. For 2015-2024 Ford and Lincoln vehicles equipped with turbocharged engines and customer concern of an engine oil leak, refer to Workshop Manual (WSM), Section 303-00 for oil leak inspection and testing methods. Ford has evaluated turbochargers replaced for oil leak symptoms and although oil may collect on the external surface of a turbocharger, it is extremely rare for a turbocharger assembly to be the root cause of the oil leak. Careful inspection of the turbocharger oil feed and drain tubes should be performed along with the recommended WSM procedures as needed. Warranty claims for turbocharger replacement going forward will be assessed.
SSM 520982023-12-01. Service bulletin. ENGINE AND ENGINE COOLING. Some 2020-2022 F-Super Duty vehicles equipped with a 6.7L engine may require a long block replacement of the engine for various reasons. The replacement long block may be equipped with an updated upper oil pan. If the oil filter adapter from the original engine does not mate with the new upper oil pan, service parts PC3Z-6881-A (oil filter adapter), W503277-S439 (package of 6 bolts, 4 bolts required), W718564-S450 (stud), W520101-S442 (nut), and PC3Z-14A206-A (starter cable retaining bracket) will be needed to complete the repair.
22L032023-09-06. Service bulletin. ENGINE AND ENGINE COOLING. Certain 2021-2022 Model Year Econoline, Super Duty Chassis Cab, F53 Motor Home, F59 Step Van, and F650/F750 Medium Duty Chassis Cab Vehicles Equipped with a Premium Rated 7.3L Engine - Engine Horsepower Credit
SSM 517192023-06-21. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. Some 2021-2023 F-Super Duty/E-Series vehicles equipped with a 6.2L, 6.8L or 7.3L gasoline engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0457 and/or P0455 stored in the powertrain control module (PCM). This may be due to a improper fuel filler cap installation and/or outside contamination on the fuel cap sealing surface. The fuel filler cap requires multiple turns to seal properly and should be clean of any debris on sealing surface. Advise the customer to turn the fuel filler cap clockwise until there is at least one audible click to seal properly. If the DTCs return after the fuel filler cap is cleared of debris and properly seated, refer to Workshop Manual (WSM), Section 303-13 > pinpoint test HX.
SSM 516912023-06-16. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; POWER TRAIN. 2011-2023 F-Super Duty and 2016-2024 F-650/F-750 vehicles equipped with a 6.7L engine may exhibit an elevated idle condition. During prolonged idle time, vehicles may experience this elevated idle to reduce unburned hydrocarbons from the SCR. The powertrain control module estimates hydrocarbon levels in the SCR and may increase idle speed to remove them. Idle speed will be increased to 1000 RPM for ambient temperatures near 26°C (80°F) and may increase to 1200 RPM at -40 °C (-40°F). Vehicles may exhibit exhaust smoke and diesel exhaust fluid smell during elevated idle condition. Exhaust smoke and smell condition will not affect reliability or durability of the engine. Power take-off (PTO) use and idle set point control will disable elevated speed. It is required that the operator monitor the vehicle and adhere to any Exhaust Filter warning messages.
SSM 513302023-03-03. Service bulletin. ENGINE AND ENGINE COOLING. Some 2020-2022 F-Super Duty vehicles equipped with a 7.3L engine may exhibit a ticking/clicking/tapping noise at idle that is loudest at the front of the engine where the front timing cover meets the oil pan. This may be due to a cracked oil pump drive gear. If the noise originates from the lower front of the engine, remove the accessory drive belt and retest. If the noise is still present, remove the oil pan and rotate the crankshaft 360 degrees to inspect for cracking. If cracked, replace the oil pump drive gear (LC3Z-6306-A).
SSM 512512023-01-05. Service bulletin. ENGINE AND ENGINE COOLING. Some 2011-2022 F-Super Duty vehicles equipped with a 6.7L diesel engine may exhibit a ticking noise at idle after an engine oil change. It is often referred to as Typewriter Noise because of its similarity to the sound of a mechanical typewriter. When engine temperatures reach 150 °F (65 °C) or higher, (from engine idle up to approximately 1700 RPM's), this noise can typically be heard at the front wheel well and is often isolated to the transmission bell housing or oil pan area. Typewriter Noise is not detrimental to engine function or durability and has no short or long term effects on the engine. Do not attempt repairs to eliminate this noise. This noise is characteristic of the 6.7L diesel engine and will typically cease or diminish significantly within the oil change maintenance interval.
SSM 511702022-11-29. Service bulletin. ENGINE AND ENGINE COOLING. Some 2020-2022 F-Super Duty vehicles equipped with a 6.7L engine may exhibit an A/C system blowing only warm air. This may be due to the powertrain control module inhibiting the engagement of the air conditioning compressor clutch with parameter identification (PID) AC_INHIBIT_11 status showing TRUE. If this PID shows TRUE but the ambient air temperature PID reads correctly, this may be due to a disconnected mass air flow sensor with the ignition on, especially after checking the condition of the engine air filter. To correct the condition, clear all diagnostic trouble codes and perform the HVAC or FCIM - Reset the Outside Air Temperature Sensor Learned Values application. If the condition remains, the vehicle needs to be driven for 2-5 minutes over 23 mph (37 km/h). If the condition still remains, refer to Workshop Manual, Section 412-00 for normal diagnostics.
SSM 511502022-10-31. Service bulletin. ENGINE AND ENGINE COOLING. 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, P132A, P2564, P2565, P2598, P259E, and/or P259F stored in the powertrain control module. If Workshop Manual (WSM) diagnostics lead to turbocharger variable vane actuator replacement, service part LC3Z-9G488-B has been released for service. Replacement of the turbocharger assembly is no longer required. When performing the VGT (Variable Geometry Turbo) Valve reset, make sure that engine coolant temperature (ECT) is at least 158° F (70° C).
SSM 510782022-09-20. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Some 2020-2022 F-Super Duty vehicles equipped with a 6.2L or 7.3L gas engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0339 stored in the powertrain control module (PCM) or the vehicle may exhibit a runs rough concern with no DTCs. This may be due the crankshaft position (CKP) sensor. If pinpoint test JD in the Powertrain Control/Emissions Diagnosis (PC/ED) Manual or Workshop Manual (WSM), Section 303-14 leads to CKP sensor replacement, use service part LC3Z-6C315-C. For claiming, use causal part 6C315 and labor operation 12650D57D in the Service Labor Time Standards (SLTS) Manual.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.