# Service bulletin 21B10\-S2

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.

- Type: Service bulletin
- NHTSA id: 10199480
- Published by NHTSA: 2021\-08\-02
- Manufacturer's number: 21B10\-S2
- Manufacturer's date: 2021\-07\-15
- NHTSA component: EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING

## NHTSA's summary

In some of the affected vehicles, an undesirable noise may develop from the cam phasers in the 3.5L GTDI engine. This noise might occur as a rattle when starting the engine after the vehicle was turned off for an extended period of time, or as a knocking noise when the engine is idling after it is warmed up. A cam phaser that has developed an undesirable noise does not affect the vehicle safety, performance, or emissions.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199480-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10199480-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Equipment and accessories

## Vehicles listed

- 2018 to 2020 FORD EXPEDITION
- 2017 to 2020 FORD F\-150
- 2018 to 2020 LINCOLN NAVIGATOR

## Recalls for the same vehicles and component

- [25V628000](/recalls/nhtsa/25V628000.md), 2025-09-19: ENGINE
- [24V852000](/recalls/nhtsa/24V852000.md), 2024-11-08: EQUIPMENT:OTHER:LABELS
- [23V420000](/recalls/nhtsa/23V420000.md), 2023-06-09: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
- [19V278000](/recalls/nhtsa/19V278000.md), 2019-04-08: ENGINE; EQUIPMENT:ELECTRICAL
- [18V894000](/recalls/nhtsa/18V894000.md), 2018-12-18: ENGINE
- [2017515](/recalls/tc/2017515.md), 2017-10-24: Engine
- [17V672000](/recalls/nhtsa/17V672000.md), 2017-10-23: ENGINE
- [2017276](/recalls/tc/2017276.md), 2017-05-23: Accessories

## Other bulletins for the same vehicles and component

- [SSM 55228](/bulletins/11038440.md), 2026-10-12, 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.
- [SSM 54262](/bulletins/11024017.md), 2025-10-07, Service bulletin: ENGINE. Some 2019\-2020 Edge/Nautilus vehicles equipped with a 2.7L EcoBoost, 2020 Aviator vehicles equipped with a 3.0L EcoBoost or 3.0L plug\-in hybrid electric vehicle \(PHEV\) engine, 2020 Explorer vehicles equipped with a 3.0L EcoBoost, and 2020 F\-150 vehicles equipped with a 2.7L 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. If diagnostics lead to the VCTs as the source of the noise, refer to the 2024 F\-150 Workshop Manual \(WSM\), Section 303\-00 \> Diagnosis and Testing \> Engine \> Pinpoint Test F. Pinpoint test F has been updated to include additional steps along with a video on how to identify the single affected VCT unit that requires replacement.
- [SSM 53764](/bulletins/11018521.md), 2025-05-21, 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 52772](/bulletins/11006443.md), 2024-08-16, 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.
- [TSB 24\-2115](/bulletins/10254166.md), 2024-05-04, Service bulletin: ENGINE AND ENGINE COOLING. This article supersedes TSB 22\-2260 to update the vehicle applications. Some 2018\-2020 F\-150 vehicles equipped with a 2.7L EcoBoost may exhibit an illuminated malfunction indicator lamp \(MIL\) with diagnostic trouble codes \(DTCs\) P0420 and/or P0430 stored in the powertrain control module \(PCM\). This may be due to calibration and controls sensitivity.
- [SSM 52476](/bulletins/10254138.md), 2024-05-03, Service bulletin: EQUIPMENT. All accessory stick\-on keyless entry keypads come with a wallet card containing the master code. If the accessory keypad was factory installed, this card will be placed in the glove box and should be handed to the vehicles owner during initial delivery. Unlike the integrated \(wired\) factory keypad, the accessory keypad master code cannot be retrieved from the vehicle using a diagnostic scan tool. If the wallet card for an accessory keypad is lost, follow these steps to recover the code. Dealer Key Code access is granted through the Dealer Program Enrollment System \(DPES\); dealership management can authorize users. The authorized user must go to FMCDealer.com \> Parts and Service \> Parts Product Line Information \> Keys/Entry Devices \> Aftermarket Keyless Entry Keypad Code Access. Follow the instructions on the screen to obtain the master code for the accessory keypad.
- [SSM 52447](/bulletins/10254122.md), 2024-05-03, 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.
- [22M03 S1](/bulletins/10253963.md), 2024-05-02, Service bulletin: EQUIPMENT. Certain 2017\-2020 Model Year Continental and Super Duty, 2018\-2020 Navigator, 2020 Aviator, and 2020 Explorer Vehicles Replace Front and/or Side Cameras if Foggy
- [TSB 24\-2098](/bulletins/10252672.md), 2024-04-04, Service bulletin: ENGINE AND ENGINE COOLING. This article supersedes TSB 23\-2330 to update the Parts List. Some 2015\-2017 F\-150 vehicles equipped with a 2.7L EcoBoost engine may exhibit an oil leak from the oil pan RTV seal. This may be due to various concerns with the oil pan. To correct the condition, follow the Service Procedure to replace the oil pan with the later style oil pan.
- [SSM 52335](/bulletins/10251952.md), 2024-03-20, 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.

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