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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.

By type

By component

By trouble code

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
SSM 519392023-10-06. Service bulletin. POWER TRAIN. Some 2017-2023 Ford and Lincoln vehicles equipped with a 10R60/10R80/10R80 MHT/10R100 transmission may exhibit a whine noise at idle and/or while driving. This may be identified as coming from the bellhousing and the front of the transmission fluid pan. The whine noise may become louder when the transmission is at operating temperature and may increase with engine revolutions per minute (RPM) in the park (P) position. A small amount of whine noise is considered to be characteristic of the 10R60/10R80/10R80 MHT/10R100 transmissions due to the offset gear drivetrain in the front support and has no effect on durability. Use the Report a Vehicle Concern link at the bottom of OASIS to submit a report if there is a customer concern of whine noise describing operating conditions and noise severity.
TSB 23-22192023-09-26. Service bulletin. POWER TRAIN. Some 2021-2023 Bronco vehicles may exhibit no 3rd gear engagement and/or a grinding noise going into 3rd and/or 4th gear. This may be due to the transmission shifting system and clutch interaction such as a lack of full clutch disengagement during shifts and/or placing weight upon the gear shift lever while driving. To correct this condition, follow the Service Procedure to replace the 3rd and/or 4th gears and/or synchronizers as needed.
TSB 23-22502023-08-30. Service bulletin. POWER TRAIN. This article supersedes TSB 22-2428 and 23-2176 to update the Issue, Action and Service Procedure. Some 2017-2023 F-150, 2018-2023 Expedition/Navigator/Mustang, 2019-2023 Ranger, 2020-2023 Explorer/Aviator/Transit and 2021-2023 Bronco vehicles equipped with a 10R60/10R80/10R80MHT transmission may exhibit a harsh/delayed engagement and/or harsh/delayed shift, an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0751, P0752, P0756, P0757, P0761, P0762, P0766, P0767, P0771, P0772, P2700, P2701, P2702, P2703, P2704, P2705, P2707, P2708, P0729, P0731, P0732, P0733, P0734, P0735, P0736, P076F, P07D9, P07F6 and/or P07F7 stored in the powertrain control module (PCM) or transmission control module (TCM). This may be due to the software in the powertrain control module (PCM) or transmission control module (TCM), the transmission solenoid ID strategy, sticking valves in the main control valve body and/or axial movement of the CDF clutch cylinder (7H351) sleeve. To correct the condition, follow the Service Procedure to identify and correct the condition.
SSM 516872023-06-16. Service bulletin. UNKNOWN OR OTHER; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; POWER TRAIN. TSB 22-2428 is missing some labor operations. For any missing labor operations, claim available new model labor operations or m-time. Refer to this article on the repair order. When replacing the CDF cylinder, the current TSB does not require a complete transmission overhaul or cooler and converter flushing. Ford is currently reviewing the TSB. Monitor OASIS for updates.
TSB 23-20192023-06-13. Service bulletin. POWER TRAIN; POWER TRAIN:MANUAL TRANSMISSION:INTERNAL:GEARS. Some 2021-2023 Bronco vehicles equipped with a MT88 manual transmission may experience a rotational scraping noise while the transmission is in neutral, 1st or 2nd gear with the clutch pedal released and may be more noticeable in ambient temps below 10°C (50°F) and after a cold soak. This noise may diminish as the transmission warms up. This may be due to the 5th and 6th gear synchronizer rings. To correct the condition, follow the Service Procedure to replace the 5th and 6th gear synchronizer rings.
SSM 516772023-06-08. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM:SOFTWARE. Some 2021-2023 Bronco vehicles may exhibit an inaccurate AAT reading with DTC P0072 stored in the powertrain control module (PCM). The Workshop Manual (WSM), Section 413-01 > pinpoint test (PPT) BC has been updated to address this concern. The AAT WSM updates include: improved diagnosis and testing, AAT sensor reset, and the AAT sensor interaction with climate control system and gateway module A (GWM).
TSB 22-24282023-05-30. Service bulletin. POWER TRAIN. Some 2017-2023 F-150, 2018-2023 Expedition/Navigator/Mustang, 2019-2023 Ranger, 2020-2023 Explorer/Aviator/Transit and 2021-2023 Bronco vehicles equipped with a 10R60 transmission and built on or before 23-Dec-2022 or with a 18R80/10R80MHT transmission and built on or before 15-Aug-2022 may exhibit a harsh/delayed engagement and/or harsh/delayed shift. It is possible the vehicle may also have an illuminated malfunction indicator lamp (MIL) or diagnostic trouble codes (DTC) P0751, P0752, P0756, P0757, P0761, P0762, P0766, P0767, P0771, P0772, P2700, P2701, P2702, P2703, P2704, P2705, P2707, P2708, P0729, P0731, P0732, P0733, P0734, P0735, P0736, P076F, P07D9, P07F6 and/or P07F7 stored in the powertrain control module (PCM) or transmission control module (TCM). This may be due to the software in the PCM or TCM, the transmission solenoid ID strategy, sticking valves in the main control valve body and/or axial movement of the CDF clutch cylinder (7H351) sleeve.
TSB 23-21542023-05-23. Service bulletin. BACK OVER PREVENTION:SOFTWARE; POWER TRAIN. 2021-2022 F-150 vehicles with 2.7L, 3.3L, 3.5L EcoBoost or 5.0L engines, 2020-2022 Transit vehicles with 3.5L Duratec/3.5L EcoBoost engines, 2021-2023 Bronco with the 2.3L or 2.7L engine having charging system diagnostics performed in the Workshop Manual (WSM) may experience the generator voltage desired (GENVDSD) parameter identification (PID) missing from the powertrain control module (PCM) PID list in the Ford Diagnosis And Repair System (FDRS) scan tool. This may be due to a software parameter in the PCM. To correct the condition, follow the Service Procedure to reprogram the PCM.
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 515312023-05-04. Service bulletin. POWER TRAIN. Some 2020-2023 Explorer/Aviator/Transit, 2021-2023 F-150/Bronco, 2022-2023 Expedition/Navigator/Mustang and 2023 F-250/F-350 Super Duty vehicles may exhibit harsh/delayed engagement and/or harsh/delayed shift concerns. These may be addressed with the powertrain control module (PCM)/transmission control module (TCM) Transmission Accelerated Main Control Break In Routine and/or a main control overhaul. Refer to Workshop Manual (WSM), Section 307-01, DTC Chart if DTCs are present and/or Diagnosis By Symptom to identify the clutch(s) to be cycled. Cycling the shift solenoids and clutch control valves to remove contamination must be performed along with an adaptive drive cycle before attempting repair. For claiming, use causal part 7A100 and applicable labor operations in Section 7 of the Service Labor Time Standards (SLTS) Manual.
SSM 514192023-04-04. Service bulletin. POWER TRAIN. Some 2017-2023 Ford and Lincoln vehicles equipped with a 10R60/10R80/10R80 MHT/10R100 transmission may exhibit a whine noise at idle and/or while driving. This may be identified as coming from the bellhousing and the front of the transmission fluid pan. The whine noise may become louder when the transmission is at operating temperature and may increase with engine revolutions per minute (RPM) in the park (P) position. A small amount of whine noise is considered to be characteristic of the 10R60/10R80/10R80 MHT/10R100 transmissions due to the offset gear drivetrain in the front support and has no effect on durability.
TSB 22-23712023-01-05. Service bulletin. POWER TRAIN. Some 2021-2022 Bronco vehicles equipped with a MT88 manual transmission may experience a rotational scraping noise in ambient temps below 10C (50F) and after a cold soak with the transmission in neutral, 1st and/or 2nd gear and clutch engaged. The noise may go away as the transmission warms up. This may be due to the 5th and 6th gear synchronizer rings. To correct the condition, follow the Service Procedure to replace the 5th and 6th gear synchronizer rings.
TSB 22-24472022-12-02. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE); UNKNOWN OR OTHER. Some 2021-2022 Bronco vehicles may exhibit an illuminated powertrain malfunction (wrench) indicator and diagnostic trouble codes (DTCs) C05D9:19 and/or C05D9:99 stored in the all-wheel drive (AWD) module and inoperative AWD system. These DTCs maybe setting due to a low battery state of charge. To correct the condition, follow the Service Procedure to verify the battery condition and reprogram the AWD module.
22B272022-11-01. Service bulletin. POWER TRAIN. Certain 2021 Model Year Bronco Vehicles Front Driveshaft Replacement. In the affected vehicles, the front driveshaft constant-velocity (CV) joint boot material is not robust for this application and may fail under normal vehicle usage. A failed CV joint boot may result in a loss of grease and the accumulation of debris in the CV joint, leading to noise and/or vibration while driving.
TSB 22-21362022-05-02. Service bulletin. POWER TRAIN. Some 2021-2022 Bronco vehicles may exhibit an illuminated powertrain malfunction (wrench) indicator and diagnostic trouble codes (DTCs) C05F9 and/or C05D9 stored in the all-wheel drive (AWD) module and inoperative AWD system. These DTCs maybe setting due to a low battery state of charge. To correct the condition, follow the Service Procedure to verify the battery condition and restore the AWD module logic.
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.
SSM 505292022-02-23. Service bulletin. POWER TRAIN. Some 2021-2022 Bronco/F-150/Explorer/Aviator/Police Interceptor Utility and 2022 Transit vehicles may exhibit harsh/delayed engagement and/or harsh/delayed shift concerns. These may be addressed with the powertrain control module (PCM)/transmission control module (TCM) Transmission Accelerated Main Control Break In Routine and/or a main control overhaul. Refer to Workshop Manual (WSM), Section 307-01, DTC Chart if DTCs are present and/or Diagnosis By Symptom to identify the clutch(s) to be cycled. Cycling the shift solenoids and clutch control valves to remove contamination must be performed along with an adaptive drive cycle before attempting repair. For claiming, use causal part 7A100 and applicable labor operations in Section 7 of the Service Labor Time Standards (SLTS) Manual.
SSM 503292021-12-26. Service bulletin. POWER TRAIN. Some 2021 Bronco/F-150/Explorer/Aviator/Police Interceptor Utility vehicles, non-hybrid, may exhibit harsh/delayed engagement and/or harsh/delayed shift concerns. These may be addressed with the powertrain control module (PCM)/transmission control module (TCM) Transmission Accelerated Main Control Break In Routine. Refer to Workshop Manual (WSM), Section 307-01, DTC Chart and/or Diagnosis By Symptom to identify the clutch(s) to be cycled. Cycling the shift solenoids and clutch control valves to remove contamination must be performed along with an adaptive drive cycle before attempting repair. This routine's usage has been expanded for various symptoms across the life of the vehicle. For claiming, use causal part 7A100 and applicable labor operations in Section 7 of the Service Labor Time Standards (SLTS) Manual.
TSB 21-23662021-11-02. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE. Some 2021 Bronco vehicles equipped with a 2.7L EcoBoost engine and built on or before 01-Sep-2021 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P2096 and/or P2098 stored in the powertrain control module (PCM). This may be due to various software parameters within the PCM and/or a catalyst monitor sensor. To correct the condition, follow the Service Procedure to reprogram the PCM.
TSB 21-23542021-11-02. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Some 2021 Bronco vehicles built on or before 23-Aug-2021 may experience a charging system fault message displayed in the instrument panel cluster (IPC) and diagnostic trouble codes (DTC) U012D, U0284 and/or U0285 stored in the powertrain control module (PCM). This may be due to water intrusion in the active grille shutter connector. To correct this condition, follow the Service Procedure to inspect for water intrusion in the active grille shutter harness connector and repair as needed.
SSM 502102021-10-29. Service bulletin. POWER TRAIN:DRIVELINE:DRIVESHAFT; ENGINE; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Some 2021 Bronco vehicles built on or before 14-Sep-2021 may experience a loss of power when driving with various illuminated warning indicators displayed in the instrument panel cluster (IPC). This may be due to an improper seating of the wiring harness push pins to the driveshaft loop which can cause an interference condition between the rear driveshaft and the 14405 harness near the C2370/C350 connector. If suspected, inspect the harness and connector for damage and repair as necessary. Once inspected and/or repaired fully, seat the harness push pins to the driveshaft loop.
SSM 502032021-10-29. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. Some 2019-2021 Ranger vehicles built on or before 09-Aug-2021 and 2021 Bronco vehicles may experience a loss of power when driving in freezing temperatures with an illuminated malfunction indication lamp (MIL) and/or powertrain malfunction indicator (wrench) lamp with diagnostic trouble codes (DTC) P2111, P2112, and/or P2119. This may be due to water or ice buildup in the intake manifold behind the throttle body. If suspected, remove the throttle body and inspect for the presence of water or ice in the base of the intake manifold. If water or ice is found, replace the intake manifold with part number KB3Z-9424-B and crankcase vent oil separator hose, part number LB5Z-6A664-D. Refer to Workshop Manual (WSM) Sections 303-01 and 303-08. For claiming, use causal part number 9424 and applicable labor times from Section 09 of the Service Labor Times Standard (SLTS) Manual.
SSM 501842021-10-29. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CLUTCHES/BANDS:ACTUATORS/SOLENOIDS. Some 2021 Bronco/F-150/Explorer/Aviator/Police Interceptor Utility vehicles, excluding hybrid, may exhibit harsh or delayed engagement/shift concerns. Most concerns may be addressed with the PCM/TCM Transmission Accelerated Main Control Break In Routine. Refer to Workshop Manual (WSM), Section 307-01, DTC Chart and/or Diagnosis By Symptom to identify the clutch(s) to be cycled. This routine cycles the shift solenoids and clutch control valves to remove contamination that may be sticking the valves and must be performed along with an adaptive drive cycle before attempting internal service. Although this routine was developed for low mileage vehicles, its usage is being expanded for various symptoms across the life of the vehicle.For claiming, use causal part 7A100 and applicable labor operations in Section 7 of the Service Labor Time Standards (SLTS) Manual.
SSM 499282021-08-02. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:MANUAL TRANSMISSION:INTERNAL:DOGS/SYNCHROS. Some 2021 Mustang Mach-E, F-150, Edge/Nautilus or Bronco vehicles equipped with SYNC 4 may have a customer symptom of the SYNC voice commands being activated without pushing the steering wheel switch. This may be due to the feature called Wake Word within SYNC 4. This feature allows the driver to activate the SYNC 4 system without pushing the steering wheel switch. Under the touchscreen Settings > Voice Settings the preferred Wake Word can be changed. The feature can also be disabled if the customer does not want the SYNC voice commands being activated without touching the steering wheel switch. This feature is not a defect. Do not submit a claim for this condition.

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