WenmarOpen by Wenmar Pro

Service bulletin TSB 23-2144

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10237578
Published by NHTSA2023-06-07
Manufacturer's numberTSB 23-2144
Manufacturer's date2023-06-05
NHTSA componentPOWER TRAIN

NHTSA's summary

Some 2023 Bronco/Explorer/Aviator vehicles equipped with a 10R60 automatic transmission built on 8-Dec-2022 and through 22-Dec-2022 may exhibit a whine noise during coast down from 25 mph (40 km/h). Vehicles built on 6-Feb-2023 and through 1-Mar-2023 may exhibit a whine noise during acceleration in 1st gear. These conditions may be caused by the machining of the No. 4 shell and sun gear. To correct the conditions, follow the Service Procedure to replace No. 4 shell and sun gear.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Transmission and driveline

Vehicles listed
FORD BRONCO2023
FORD EXPLORER2023
LINCOLN AVIATOR2023

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20261882026-04-15. Powertrain
26V2360002026-04-14. POWER TRAIN:AUTOMATIC TRANSMISSION
23V5460002023-08-03. POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:PARK PAWL
20230572023-02-13. Powertrain
23V0700002023-02-10. POWER TRAIN:AUTOMATIC TRANSMISSION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
TSB 26-24082026-09-30. Service bulletin. This bulletin supersedes 26-2309. Reason For Update: update the Model section to remove Aviator 10R80, update the Parts list to add 3.3L to W520514-S440, and add L1MZ-7Z490-G valve body separator plate for Aviator. Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: * Harsh 3-4, 4-5 upshifts * Harsh 5-3, 4-3 downshifts * Harsh reverse engagements These symptoms may be worse when cold. This may be due to the F clutch friction plates brinelling into the clutch and planetary container cylinder (7B177).
TSB 26-23952026-09-01. Service bulletin. This article supersedes 26-2287. Reason for update: update the labor operation numbers to add MT to operations C, F, G, H, J, K, L and M, and correct the part number LIMZ-4A015-B to L1MZ-4A015-B. Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: Harsh engagement Delayed engagement Harsh shift Delayed shift Illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC)s 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 axial movement of the CDF clutch cylinder sleeve causing hydraulic circuit leaks. NOTE: If internal transmission service is required to address a concern detected with the CDF clutch cylinder following this article, technicians should carefully inspect and replace other transmission components and flush transmission fluid cooler only as ne
SSM 550732026-08-11. Service bulletin. Some 2021-2026 Bronco vehicles may require the removal and installation of the transfer case for various reasons. Installation requires Loctite® 243 adhesive applied to the mounting bolt threads in the transmission. Make sure that the mating faces are clean and dry. Tightening the mounting bolts also requires an updated two-stage tightening sequence. Workshop Manual (WSM), Sections 307-07C/D and 308-07C/D Installation > Transfer Case have been updated to reflect this change.
SSM550592026-08-03. Service bulletin. Some 2021-2023 F-150 vehicles equipped with a 3.5L PowerBoost engine, 2020-2026 Explorer vehicles equipped with a 3.3L hybrid engine, and 2020-2023 Lincoln Aviator vehicles equipped with a 3.0L EcoBoost hybrid engine may exhibit an illuminated powertrain malfunction (wrench) indicator with diagnostic trouble code (DTC) P0A1E stored in the powertrain control module (PCM). The vehicle may be unable to enter electric-only drive modes as expected during normal drive cycles. This may be due to the belt integrated starter generator (BISG). For vehicles with this condition, follow the necessary Pinpoint Test in Workshop Manual (WSM), Section 303-06 for DTC P0A1E and repair the vehicle as directed. Note that previous replacement of the BISG does not negate the need for subsequent BISG replacements if directed to do so by the appropriate Pinpoint Test diagnostics. Engineering is investigating this BISG quality concern. Monitor PTS for updates regarding this investigation.
TSB 26-23092026-07-01. Service bulletin. This bulletin supersedes 26-2241. Reason For Update: update the parts list to correct the claim quantity of the part number JB3Z-4B496-B from 3 to 6. Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: * Harsh 3-4, 4-5 upshifts * Harsh 5-3, 4-3 downshifts * Harsh reverse engagements These symptoms may be worse when cold. This may be due to the F clutch friction plates brinelling into the clutch and planetary container cylinder (7B177).
TSB 26-22912026-06-22. Service bulletin. This bulletin supersedes 26-2006. Reason for update: update the Parts list to correct the ambient air temperature service part number. Some vehicles listed in the model statement above may require the replacement of the ambient air temperature sensor for various concerns. DTCs P0071, P0072, and/or P0073 may be present in the powertrain control module (PCM).
TSB 26-22872026-06-22. Service bulletin. This article supersedes 25-2302. Reason for update: update the labor time allowance for F-150 vehicles, update the Parts list to replace the part number W716979-S439 with W721084-S439, and add a note for LV fluids XT-10-QLVC and CXT-10-LV6 "Transfer Case Fluid". Some of the vehicles listed in the Model statement above may exhibit at least one of the following conditions: Harsh engagement Delayed engagement Harsh shift Delayed shift Illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC)s 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 axial movement of the CDF clutch cylinder sleeve causing hydraulic circuit leaks. NOTE: If internal transmission service is required to address a concern detected with the CDF clutch cylinder following this article, technicians should carefully inspect and replace other tra
SSM 549022026-06-09. Service bulletin. For 20202026 vehicles equipped with the 10R60 transmission, a new Transmission Clutch Circuit Leak Test has been introduced in the Ford Diagnosis and Repair System (FDRS). This test utilizes the pressure and vacuum transducer (PVT) when available. Workshop Manual (WSM) updates related to this diagnostic procedure are planned for release in Q4 2026. The new test improves the accuracy of detecting leaks within transmission fluid circuits and replaces the previous air check method. The previous air check procedure has been shown to produce a high rate of false positives, which may lead to unnecessary repairs when no actual leak is present. Accordingly, the air check procedure is not to be used for diagnosing internal transmission hydraulic leaks or as justification for transmission replacement.
SSM 548272026-05-19. Service bulletin. Some 2020-2026 Explorer/Police Interceptor Utility/Aviator vehicles may require replacement of the front drive halfshaft inner/outer CV joint boot for various reasons. If Workshop Manual (WSM), Section 205-04 > Diagnosis and Testing leads to CV joint boot replacement, L1MZ-3A331-G (Explorer/Police Interceptor Utility front inner/outer CV joint boot kit), L1MZ-3A331-H (Aviator front inner/outer CV joint boot kit), L1MZ-3A331-F (Explorer/Police Interceptor Utility front inner CV joint boot kit) and L1MZ-3A331-E (Aviator front inner CV joint boot kit) have been released for service. Refer to WSM, Section 205-04 for Removal and Installation procedures.
SSM 548182026-05-18. Service bulletin. Some 2021-2024 Bronco vehicles equipped with a manual transmission may experience a rotational scraping noise while the transmission is in neutral, 1st and/or 2nd gear with the clutch pedal released. The noise may be more noticeable in ambient temps below 10°C (50°F) and after a cold soak. This noise may also diminish as the transmission warms up. This may be due to the 5th and 6th gear synchronizer rings. The 5th and 6th gear synchronizer rings are now only available in the 6th/5th gear synchronizer assembly (service part number MU7Z-7124-Q). To correct the condition, replace the 6th/5th gear synchronizer. Remove the transmission from the vehicle. Refer to Workshop Manual (WSM), Section 308-03 > Removal. Disassemble the transmission. Refer to WSM, Section 308-03 > Disassembly. Disassemble the input shaft to gain access to the 6th/5th gear synchronizer. Refer to WSM, Section 308-03 > Disassembly and Assembly of Subassemblies > Input Shaft. Replace the 6th/5th gear synchronizer and assemble the input shaft. Assemble the transmission. Refer to WSM, Section 308-03 > Assembly. Install the transmission.