# Service bulletin SSM 49837

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: 10194653
- Published by NHTSA: 2021\-06\-01
- Manufacturer's number: SSM 49837
- Manufacturer's date: 2021\-05\-28
- NHTSA component: EQUIPMENT ADAPTIVE/MOBILITY; STRUCTURE; EQUIPMENT

## NHTSA's summary

Some 2021 Mustang Mach 1 vehicles equipped with the handling package and built on or before 25\-Mar\-2021 may have been shipped to dealers without a front splitter. The front splitter is a loose shipped item that should be installed during the pre\-delivery inspection \(PDI\) process. For more information, access the following dealership communication located on FMCDealer.com by copying and pasting the following link into a web browser https://www.fmcdealer.dealerconnection.com/content/fmcdealer/en/us/edc/2021/qafmm1p5321.html. The communication can also be found by navigating to the dealer communications page on FMCDealer.com. On the 'Dealer Communication' page, select 'May 2021' in the Month/Year category. Scroll down to 'May 3, 2021' and click on the link 'Q\&A: 2021 Ford Mustang Mach 1 Part'.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194653-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194653-9999.pdf)

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

## Components

Body and frame, Equipment and accessories

## Vehicles listed

- 2021 FORD MUSTANG

## Other bulletins for the same vehicles and component

- [SSM 54601](/bulletins/11029052.md), 2026-02-27, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY; UNKNOWN OR OTHER. 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 \(BCM\). The Factory Keyless Entry Code application within the diagnostic scan tool will not provide an applicable master code for the accessory wireless keypad. If the wallet card for an accessory keypad is not available, the "Wireless RF Keypad Diagnosis Guide" can be referenced and provides direction on how to retrieve the master code. This guide is located under the Workshop Manual tab \> Accessories \> Installation \> Wireless RF Keypad Diagnosis Guide \> PPT C \> Step C2.\<br /\>\<br /\> Note: The only available keypad for some vehicles from the assembly plant is the accessory wireless keyless entry keypad. The integrated wired keypad cannot be installed on vehicles not equipped from the factory with a wired keyless entry k
- [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.
- [21N10 S1](/bulletins/10246072.md), 2023-12-05, Service bulletin: LATCHES/LOCKS/LINKAGES; STRUCTURE:BODY:DOOR. Certain 2015 – 2021 Model Year Mustang Convertible Vehicles \- Door Opens to Secondary Latch Position
- [TSB 23\-2334](/bulletins/10244797.md), 2023-11-03, Service bulletin: EQUIPMENT; STRUCTURE:BODY:DOOR. This article supersedes TSB 21\-2220 to update the model years affected and part list. Some 2018\-2024 Mustang coupe vehicles may exhibit a sagging headliner or gap where the headliner meets the upper door weatherstrip. This may be due to an outward bent door frame moulding not allowing the weatherstrip to overlap the headliner properly. To correct this condition, follow the Service Procedure to replace the door frame moulding.
- [TSB 23\-2307](/bulletins/10244707.md), 2023-11-02, Service bulletin: UNKNOWN OR OTHER; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM\(GLOBAL POSITIONING SYSTEM\); ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE. Some 2019\-2020 Edge/F\-150/Fusion/Continental/MKZ/Nautilus, 2019\-2021 Mustang/Ranger/Transit Connect, 2020\-2021 EcoSport/Escape/Expedition/Explorer/F\-Super Duty/Aviator/Corsair/Navigator, 2021 Bronco Sport and 2020\-2022 Explorer/Aviator vehicles with SYNC 3 may experience various SYNC performance related concerns. This may be due to the SYNC Software. To correct the condition, follow the Service Procedure to update the SYNC module \(APIM\) software.
- [SAN\-Vol1 I1](/bulletins/10240743.md), 2023-08-16, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. The Service Awareness Newsletter is an informal communication that contains information that may not be presently available in a TSB, SSM, GSB, or other electronic communication. This article includes information on warranty, technical service tips and other service information.
- [SB23\-01](/bulletins/10240305.md), 2023-08-03, Service bulletin: SUSPENSION; STEERING; EQUIPMENT. Spl Parts, Inc. communications index accompanying MCP uploads 23mc40464 \& 23mc40471
- [SB 23\-01](/bulletins/10240266.md), 2023-08-02, Service bulletin: EQUIPMENT; SUSPENSION; STEERING. SPL Parts, Inc. manufacturers and distributes aftermarket lower control arms for dedicated competition vehicles and "track day" cars some of which may be used on both track and highway. SB 23\-01 adresses proper installation torque of cap bolt fasteners attaching SPL's aftermarket lower control arms, recurring inspection and confirmation of torque setting and removal and replacement of damaged or under torqued fasteners to reduce risk of premature failure and accident. SB\-23\-01 was mailed, emailed and posted on SPL website to known resellers, race teams and users of the affected parts and is being submitted here as required by part 579.5. Vehicle Applications include: BMW series 1,2,3,\& 4, 2008\-2023; Chevrolet Camaro 26\-2023, Cadillac ATS, CTS 2016\-2019; Ford Mustang 2015\-2023; Toyota Supra 2020\-2023.
- [SSM 51687](/bulletins/10237786.md), 2023-06-16, 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.
- [SSM 51536](/bulletins/10235153.md), 2023-05-04, Service bulletin: STRUCTURE. For 2000\-2024 Ford and Lincoln vehicles, swapping a module from a vehicle for diagnosis purposes is likely to cause errors and is not recommended. It is also not recommended to order a replacement module using a vehicle identification number \(VIN\) from a different vehicle. Most modules on these affected vehicles are VIN/vehicle specific and hardware variations between modules do exist. Swapping a module from a vehicle or ordering a module using a different vehicle/VIN can cause ineffective repairs and additional vehicle down time. Make sure all appropriate Workshop Manual \(WSM\) procedures are followed when diagnosing the condition prior to all module replacements and only order modules using the correct VIN.

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