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Service bulletins for the 2021 Ford Bronco

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.

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

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By component

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Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
SSM 552282026-10-12. Service bulletin. ENGINE; UNKNOWN OR OTHER. Some 2020-2026 Aviator/Explorer/F-150/Bronco/Ranger vehicles equipped with a 2.7L or 3.0L (non-diesel) engine may need the front engine cover removed and reinstalled for various reasons. The Workshop Manual (WSM), Section 303-01 Engine > Removal and Installation > Engine Front Cover service procedure has been updated to include a new essential special service tool (ESST) guide pin alignment tool (303-1790) that is used to align the engine front cover to the engine block, preventing the O-ring seal on the engine oil galley feed tube from getting damaged during installation.
25B512026-06-05. Other. ENGINE. Certain 2021-2024 Model Year Bronco, 2021-2024 Model Year Bronco Sport, 2020-2022 Model Year Corsair and Escape, 2016-2024 Model Year Explorer, 2019-2020 Model Year Fusion, 2016-2018 Model Year Focus RS, 2022-2024 Model Year Maverick, 2016-2019 Model Year MKC and 2019-2024 Model Year Ranger Vehicles Equipped with a 2.0L or 2.3L Engine and Engine Block Heater System Block Heater Replacement
HVAC-22.AA.AC Bronco2026-05-15. Over-the-air update. POWER TRAIN; ENGINE; UNKNOWN OR OTHER. Quality improvements include: - Optimizes cabin ventilation strategy at high speeds
24N12 S22026-04-07. Other. ENGINE. Certain 2021 - 2022 Model Year Various Vehicles Engine Valve Inspection Test This submission includes : Technical Instructions Updated wording and description with additional photo.
SSM 542752025-10-14. Service bulletin. ENGINE. Some 2021-2023 Explorer vehicles equipped with a 3.0L EcoBoost engine, 2021-2023 Aviator vehicles equipped with a 3.0L EcoBoost or 3.0L plug-in hybrid electric vehicle (PHEV) engine, 2021-2023 Edge/Nautilus vehicles equipped with a 2.7L EcoBoost, 2021-2024 F-150 vehicles equipped with a 2.7L EcoBoost, and 2021-2024 Bronco and 2024 Ranger vehicles equipped with a 2.7L or 3.0L EcoBoost engine may exhibit a ticking/tapping or rattle type noise from the top front cover area of the engine. This noise may occur on initial start-up after a cold soak of 6 hours or more that may last for 2-5 seconds. This may be due to an internal component of the variable cam timing (VCT) unit. Workshop Manual (WSM), Section 303-00 > Diagnosis and Testing > Engine > Pinpoint Test F has been updated to include additional steps along with a video to identify the affected VCT unit that requires replacement.
24N12 -S12025-09-02. Other. UNKNOWN OR OTHER; ENGINE. NEW VEHICLE DEMONSTRATION / DELIVERY HOLD Safety Recall 24S55 – Supplement #1 Dated: August 15, 2025 Customer Satisfaction Program 24N12 Dated June 19, 2025 New! REASON FOR THIS SUPPLEMENT • Rental Vehicles: Added specification that long block replacement must be approved by SSSC for rental coverage to apply. • Labor Allowances: Added labor operation for photo submission on all vehicles and labor operation for borescope inspection. • SSSC Approval: Borescope photo submission required for long block approval. • Parts Handling Allowance: Added additional allowance claiming information for engine replacement. • Attachments: Technical Instructions have been added to the program. PROGRAM TERMS This program provides a no-cost, one-time repair (if needed) for an engine long block replacement for vehicles that completed the 24S55 inspection process. This program will be in effect for 10 years of service or 150,000 miles from the warranty start date of the vehicle, whichever occurs first. This is
SSM 540162025-07-08. Service bulletin. ENGINE. Some 2021-2025 Bronco and 2024-2025 Ranger vehicles equipped with a 2.7L/3.0L EcoBoost engine may require removal of the engine front cover due to various concerns. Workshop Manual, Section 303-01 has been updated with improved engine front cover removal and installation service procedure steps including a new body removal and install step.
24N122025-07-02. Other. ENGINE. Certain 2021 - 2022 Model Year Various Vehicles Engine Valve Inspection Test
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.
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.
SSM 527722024-08-16. Service bulletin. ENGINE. Some 2020-2024 F-150, 2021-2024 Bronco, and 2024 Ranger vehicles equipped with a 2.7L or 3.0L EcoBoost engine may exhibit a ticking/tapping or rattle type noise from the top front cover area of the engine on initial start-up after a cold soak of 6 hours or more that may last for 2-5 seconds. This may be due to a stuck internal component of the variable cam timing (VCT) unit.
SSM 524472024-05-03. Service bulletin. ENGINE AND ENGINE COOLING. Some 2020-2024 F-150 and 2021-2024 Bronco vehicles equipped with a 2.7L or 3.0L EcoBoost engine may exhibit a ticking/tapping or rattle type noise from the top front cover area of the engine on initial start-up after a cold soak of 6 hours or more that may last for 2-5 seconds. This may be due to a stuck internal component of the variable cam timing (VCT) unit. To correct the condition, replace all 4 of the VCT units following Workshop Manual (WSM), Section 303-01. For claiming, use causal part 6C525 and applicable labor operations in Section 6 of the Service Labor Time Standards (SLTS) Manual. If labor times are not available, claim M-time.
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 521782024-01-18. Service bulletin. ENGINE; UNKNOWN OR OTHER; STRUCTURE: UNDERRIDE. Some 2021-2024 Bronco vehicles may exhibit a rattle from the front windows with the windows placed in the partially down position and driving over rough roads and/or bumps. This condition is currently under investigation and repairs and/or component replacement is not expected to reduce the rattle. Inform customers that they can continue to drive the vehicle and that engineering is currently developing a solution which will be available in Q3 2024. Monitor OASIS and schedule a follow up appointment with the customer when the fix becomes available.
SSM 521662024-01-18. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; UNKNOWN OR OTHER. Some 2021-2024 Bronco vehicles equipped with SYNC 4 may experience a concern during SYNC module (APIM) programming where the vehicle's center display screen indicates: USB Error. This may be due to a lack of memory space available to perform the APIM software update. If it is a memory concern, the Ford Diagnosis and Repair System (FDRS) will provide an option to delete the voice application. Re-enter the module programming and when prompted, do not select first option - SYNC Module (APIM) Software Update, select the second option - Delete Voice Application(s) From Module. Once deleted, run the SYNC Module (APIM) Software Update as directed, this will update the software and automatically reload the voice app. If the voice delete option is not available, continue with normal diagnostics in the Workshop Manual, Section 418.
SSM 519612023-11-03. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Some 2021-2023 Bronco vehicles may exhibit an illuminated MIL with DTCs P0096 and/or P007B in the powertrain control module (PCM), which may be more prevalent in high ambient air temperatures. For vehicles that meet this criateria, inspect the front of the vehicle for the presence of an aftermarket bumper and/or accessories which may restrict air flow to the charge air cooler and surrounding sensors. Remove the aftermarket accessory and return the vehicle to stock and reevaluate. If the concern returns with the stock bumper/accessories removed, proceed to normal Workshop Manual diagnostics.
TSB 23-21962023-06-29. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This article supersedes TSB 23-2135 to update the Part List. Some 2021-2022 Bronco vehicles equipped with a 2.7L or 3.0L EcoBoost engine may exhibit various charging system error messages and/or illuminated charging system indicator displayed in the instrument panel cluster (IPC) with diagnostics trouble code (DTC) B11DB set within the body control module (BCM). This may be due to coolant contamination into the battery monitor sensor (BMS) from a leaking transmission fluid heater coolant control valve. To correct the condition, follow the Service Procedure to clean the BMS connector and replace the transmission fluid heater coolant control valve.
SSM 516652023-05-29. Service bulletin. ENGINE AND ENGINE COOLING. Some 2021-2023 Ford and Lincoln vehicles equipped with a 2.7L or 3.0L engine may exhibit an upper engine thump/knock noise coming from the left cylinder head. This condition is most noticeable at idle and may lessen at higher engine speed or while driving. This condition does not affect vehicle durability and will not get worse over time. Use a stethoscope or chassis ears and listen just behind the left cylinder head intake VCT solenoid on the cam cover to determine if the thump/knock noise is coming from the cylinder head/camshaft. The left cylinder head and the camshaft roller followers are available as service parts.
TSB 23-21352023-05-24. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM. Some 2021-2022 Bronco vehicles equipped with a 2.7L or 3.0L EcoBoost engine may exhibit various charging system error messages and/or illuminated charging system indicator displayed in the instrument panel cluster (IPC) with diagnostics trouble code (DTC) B11DB set within the body control module (BCM). This may be due to coolant contamination into the battery monitor sensor (BMS) from a leaking transmission fluid heater coolant control valve. To correct the condition, follow the Service Procedure to clean the BMS connector and replace the transmission fluid heater coolant control valve.
SSM 515422023-05-04. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. Some 2020-2023 F-150 and 2021-2023 Bronco vehicles equipped with a 2.7L or 3.0L EcoBoost engine may exhibit a ticking/tapping or rattle type noise from the top front cover area of the engine on initial start-up after a cold soak of 6 hours or more that may last for 2-5 seconds. This may be due to a stuck internal component of the variable cam timing (VCT) unit. To correct the condition, replace all 4 of the VCT units following Workshop Manual (WSM), Section 303-01. For claiming, use causal part 6C525 and applicable labor operations in Section 6 of the Service Labor Time Standards (SLTS) Manual. If labor times are not available, claim M-time.
SSM 514152023-04-04. Service bulletin. ENGINE AND ENGINE COOLING. Customers who neutral (4-wheel flat) tow a 2021-2022 Bronco equipped with a 2.7L engine or a 2022-2023 Bronco Raptor may report an inconsistent brake assist when a supplemental braking system has been installed. This may result from supplemental brake system set-up that does not account for the vehicles anti-lock brake (ABS) module entering sleep mode after a pre-determined period of time following vehicle shut-down. This functionality was necessary to prevent a battery drain from occurring. Enhanced software has been developed to keep the ABS module in a consistent sleep state when the vehicle enters neutral tow mode. For vehicles that meet this criterion, reprogram the ABS module using the latest software level of the Ford Diagnosis and Repair System (FDRS) scan tool. For claiming, use casual part 2C219.
23B012023-03-06. Service bulletin. ENGINE AND ENGINE COOLING. Certain 2021-2022 Model Year Various Vehicle Lines Long Block Replacement
SSM 512272023-01-05. Service bulletin. SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES; ENGINE AND ENGINE COOLING. Some 2021-2023 Bronco vehicles equipped with a 2.7L or 3.0L EcoBoost engine may exhibit noises coming from the brake pedal while applying and/or releasing the brake pedal or while the vehicle is off without brake pedal application. A single click and/or clunk may be heard during brake pedal application and again on brake pedal release and is considered normal. Clicking may also be heard while the vehicle is off, and without the brake pedal being applied. The clicking heard with the vehicle off is due to the EBB going through the normal shut-down process. The amount of noise will vary between EBB modules and replacement of the EBB module is not expected to reduce the noises.
SSM 510142022-08-15. Service bulletin. ENGINE AND ENGINE COOLING. The electronic parts catalog for the 2021-2022 Bronco equipped with a 2.7L GTDI engine had the incorrect engine oil dipstick assigned. This problem only existed for a few months and has since been corrected. The incorrect dipstick that showed in the catalog was SPN: MB3Z-6750-B/F (EPN: MB3E-6750-BB/BC). The 'MB3Z' dipstick (EPN: 'MB3E') is ONLY designed for use on the 2022 Bronco Raptor which is equipped with a 3.0L GTDI engine. The correct engine oil dipstick for the 2021-2022 Bronco 2.7L GTDI engine is SPN: FT4Z-6750-B/C (EPN: FT4E-6750-BF/BG).
SSM 506702022-04-13. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; POWER TRAIN. Some 2021-2022 Ranger/Bronco vehicles equipped with a 2.3L EcoBoost engine built on or after 14-Dec-2021 and 2022 Explorer vehicles equipped with a 2.3L EcoBoost engine and built on or after 14-Dec-2021, may exhibit a lack of power with an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P25B4 stored in the powertrain control module (PCM). To correct the condition, clear the DTC and road test the vehicle under load until the vehicle reaches operating temperature. If the DTC repeats, the turbocharger will need to be replaced. For claiming use causal part 6K682 and applicable labor times found in Section 09 of the Service Labor Time Standards (SLTS) Manual. If the DTC does not repeat, release the vehicle to the customer.

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