# Service bulletin SSM 49770

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: 10194387
- Published by NHTSA: 2021\-06\-01
- Manufacturer's number: SSM 49770
- Manufacturer's date: 2021\-05\-03
- NHTSA component: POWER TRAIN; EQUIPMENT

## NHTSA's summary

Some 2019\-2021 Edge/Nautilus vehicles equipped with all wheel drive \(AWD\) may exhibit a noise from the rear of the vehicle while approaching the vehicle or prior to starting engine, which is associated with rear drive unit \(RDU\) actuator learning process. Update the driveline control module \(DLCM\) calibration to minimize the noise. If no other concerns or symptoms are present, further diagnosis or repairs are not recommended. For claiming, use causal part 4000 and applicable labor operations in Section 10 of the Service Labor Time Standards \(SLTS\) Manual.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194387-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194387-9999.pdf)

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

## Components

Equipment and accessories, Transmission and driveline

## Vehicles listed

- 2019 to 2021 FORD EDGE
- 2007 LINCOLN MKX
- 2019 to 2020 LINCOLN MKX
- 2019 to 2021 LINCOLN NAUTILUS

## Recalls for the same vehicles and component

- [2021011](/recalls/tc/2021011.md), 2021-01-18: Powertrain
- [21V011000](/recalls/nhtsa/21V011000.md), 2021-01-15: POWER TRAIN:DRIVELINE:DRIVESHAFT
- [20V550000](/recalls/nhtsa/20V550000.md), 2020-09-10: POWER TRAIN:AUTOMATIC TRANSMISSION

## Other bulletins for the same vehicles and component

- [TSB 26\-2341 v2](/bulletins/11037661.md), 2026-10-01, Service bulletin: UNKNOWN OR OTHER; POWER TRAIN. This bulletin supersedes 26\-2171. Reasons for update: update the Parts list to add a note to clarify the application of the part numbers W520102\-S442 and 4S4Z\-3N324\-AA "FWD Only". Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Shudder condition, most noticeable at speeds below 60 mph \(100 km/h\) No relevant diagnostic trouble codes \(DTC\) present Traceable shudder event with IDS/FDRS reading \*\(Figure 1\)\* This condition may be perceived/felt as an engine misfire. This may be due to a concern with the output planetary assembly.
- [TSB 26\-2341](/bulletins/11035231.md), 2026-07-27, Service bulletin: UNKNOWN OR OTHER; POWER TRAIN. This bulletin supersedes 26\-2171. Reasons for update: update the Parts list to add a note to clarify the application of the part numbers W520102\-S442 and 4S4Z\-3N324\-AA "FWD Only". Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Shudder condition, most noticeable at speeds below 60 mph \(100 km/h\) No relevant diagnostic trouble codes \(DTC\) present Traceable shudder event with IDS/FDRS reading \*\(Figure 1\)\* This condition may be perceived/felt as an engine misfire. This may be due to a concern with the output planetary assembly.
- [TSB 26\-2328](/bulletins/11035099.md), 2026-07-20, Service bulletin: POWER TRAIN; UNKNOWN OR OTHER. This bulletin supersedes 26\-2194. Reason for update: update the Parts list to correct a part description " Loctite 638", update the claim quantity for the drain/fill plug, update the claim quantity of the wheel hub bolts \(Corsair\) and limited the parts list for Edge/Nautilus to only the rear drive unit fluid. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Shudder chatter condition, most noticeable at low speeds turning No relevant diagnostic trouble codes \(DTCs\) present This may be due to internal rear drive unit \(RDU\) fluid contamination.
- [TSB 26\-2194](/bulletins/11031619.md), 2026-04-28, Service bulletin: POWER TRAIN. This bulletin supersedes 25\-2627. Reason for update: To add a Step to reprogram the all\-wheel drive \(AWD\) module for Bronco Sport vehicles. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Shudder chatter condition, most noticeable at low speeds turning No relevant diagnostic trouble codes \(DTCs\) present This may be due to internal rear drive unit \(RDU\) fluid contamination.
- [TSB 25\-2627](/bulletins/11028804.md), 2026-02-12, Service bulletin: POWER TRAIN. This article supersedes TSB 25\-2552 to update the Parts List Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Shudder chatter condition, most noticeable at low speeds turning No diagnostic trouble codes DTCs present This may be due to rear drive unit internal \(RDU\) fluid contamination.
- [SSM 54366](/bulletins/11025611.md), 2025-11-19, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM. Some 2015\-2021 Ford and Lincoln vehicles may exhibit an illuminated MIL with diagnostic trouble codes \(DTCs\) P0011, P0012, P0014, P0015, P0016, P0017, P0018, P0019, P0021, P0022, P0024 and/or P0025. Pinpoint test HK in the Powertrain Control and Emissions Diagnosis \(PC/ED\) or in Section 303\-14 of the Workshop Manual \(WSM\) has been updated to address this concern.
- [TSB 25\-2552](/bulletins/11025530.md), 2025-11-13, Service bulletin: POWER TRAIN. This article supersedes TSB 25\-2351 to update the Service Procedure Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Shudder chatter condition, most noticeable at low speeds turning No diagnostic trouble codes DTCs present This may be due to rear drive unit internal \(RDU\) fluid contamination.
- [TSB 25\-2351](/bulletins/11020999.md), 2025-07-30, Service bulletin: POWER TRAIN. This article supersedes TSB 24\-2386 to update the Service Procedure and Part List. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: Shudder chatter condition, most noticeable at low speeds turning No diagnostic trouble codes DTCs present Note: Three \(3\) new Essential Special Service Tools \(ESSTs\) are required to service the internal clutch pack on vehicles equipped with a single active torque rear drive unit \(RDU\) only. These ESSTs are expected to ship to all dealers \(US, Canada, Puerto Rico and Mexico\) in September 2025. ESST packages were shipped to 100 selected dealers in the US and Canada in May 2025, based on RDU part sales activity. The RDU Internal Clutch Kit and Adhesive Sealant are currently under restricted ordering to ensure ample supply of parts are available to dealers with the ESSTs. All parts are expected to be available for open order by Q4 2025, when the ESSTs are planned to arrive at all dealers. Note: For dealers with the ESSTs and a vehicle in the service department that requires a repair using the new RDU Internal Clutch
- [SSM 53973](/bulletins/11020044.md), 2025-07-02, 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 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.

JSON: [/v1/bulletins/10194387](/v1/bulletins/10194387)

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