# Service bulletin SSM 49388

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: 10184631
- Published by NHTSA: 2021\-01\-05
- Manufacturer's number: SSM 49388
- Manufacturer's date: 2020\-12\-09
- NHTSA component: EQUIPMENT; ENGINE AND ENGINE COOLING:ENGINE:DIESEL; POWER TRAIN; ELECTRICAL SYSTEM

## NHTSA's summary

2021 F\-150/Explorer/Aviator/Police Interceptor Utility vehicles without a diesel engine and/or without a 10R80 MHT transmission have a new PCM\-Transmission Accelerated Main Control Break In routine added to the Diagnosis and Testing Section of the WSM. This new routine uses the Ford diagnostic scan tool to cycle the shift solenoids and clutch control valves to free them from contamination that may be sticking the valves. Refer to WSM, Section 307\-01.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184631-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184631-9999.pdf)

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

## Components

Electrical system, Engine, Equipment and accessories, Transmission and driveline

## Vehicles listed

- 2021 FORD EXPLORER
- 2021 FORD EXPLORER POLICE INTERCEPT
- 2021 FORD F\-150
- 2021 LINCOLN AVIATOR

## Recalls for the same vehicles and component

- [2026311](/recalls/tc/2026311.md), 2026-06-24: Powertrain
- [26V402000](/recalls/nhtsa/26V402000.md), 2026-06-24: POWER TRAIN:AUTOMATIC TRANSMISSION
- [26V104000](/recalls/nhtsa/26V104000.md), 2026-02-20: EXTERIOR LIGHTING:TAIL LIGHTS; ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL
- [2026005](/recalls/tc/2026005.md), 2026-01-09: Electrical
- [2025554](/recalls/tc/2025554.md), 2025-10-10: Electrical
- [25V685000](/recalls/nhtsa/25V685000.md), 2025-10-10: EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER
- [25V349000](/recalls/nhtsa/25V349000.md), 2025-05-23: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY
- [2025137](/recalls/tc/2025137.md), 2025-03-14: Powertrain
- [2025135](/recalls/tc/2025135.md), 2025-03-14: Powertrain
- [25V169000](/recalls/nhtsa/25V169000.md), 2025-03-14: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)

## 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 55217](/bulletins/11038165.md), 2026-10-06, Service bulletin: ENGINE; UNKNOWN OR OTHER. Some 2020\-2024 Explorer/Aviator vehicles equipped with 3.0L EcoBoost/hybrid engine may exhibit blue or black exhaust smoke on startup for the first 5 minutes after an overnight cold soak with no illuminated malfunction indicator lamp \(MIL\) or powertrain diagnostic trouble codes \(DTCs\) present. This may be due to engine oil breaching the dynamic oil seals separating the bearing core from the turbine housing in the left side turbocharger assembly. There is a new, updated left side turbocharger oil supply tube equipped with an internal check valve to prevent the engine oil from entering turbine housing after the engine is off. Replace the existing left side turbocharger oil supply tube with the updated service part that includes the check valve \(service part\# L1MZ\-9T516\-B\) or latest level part. Refer to the Workshop Manual \(WSM\), Section 303\-04 Fuel Charging and Controls \- Turbocharger \> Removal and Installation \> Turbocharger Oil Supply Tube LH. For claiming, use causal part 9T516 and labor operation code 9440AL.
- [TSB 26\-2325](/bulletins/11037978.md), 2026-10-05, Service bulletin: EXTERIOR LIGHTING; ELECTRICAL SYSTEM; UNKNOWN OR OTHER. Some of the vehicles listed in the Model statement above may exhibit a front courtesy lamp that is inoperative. This may be due to a concern with the front courtesy lamp light module.
- [SYNC\-26.2.8.5 F\-150](/bulletins/11037310.md), 2026-09-14, Over\-the\-air update: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. 26C37 Recall remedy Prevents a potential rearview camera image obstruction caused by a menu displaying on top of it
- [TSB 26\-2391](/bulletins/11037297.md), 2026-09-12, Service bulletin: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. This bulletin updates 26\-2206. Reason for update: update the Service Procedure to revise Steps 19\-21, adding Step 22, and adding Figure 15\-16 to clarify connector C316 location. Some of the vehicles listed in the Model statement above may exhibit diagnostic trouble codes \(DTCs\) C1001:31, U3000:89, and/or U3000:49 stored in the image processing module A \(IPMA\) and at least one of the following conditions: "Front Camera Fault Service Required" message Pre\-collision assist inoperative Adaptive cruise control inoperative Front windshield camera alignment routine fails to complete This may be due to the coaxial cable between the IPMA camera and the IPMA.
- [ITRM\-26.DC F\-150](/bulletins/11037291.md), 2026-09-11, Over\-the\-air update: SERVICE BRAKES; ELECTRICAL SYSTEM; UNKNOWN OR OTHER. 26C10 Recall remedy \-Addresses instances where the trailer lights and trailer brakes may not function
- [TSB 26\-2395](/bulletins/11036595.md), 2026-09-01, Service bulletin: POWER TRAIN; UNKNOWN OR OTHER; ELECTRICAL SYSTEM. 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 55069](/bulletins/11036103.md), 2026-08-11, Service bulletin: VISIBILITY/WIPER; ELECTRICAL SYSTEM; STRUCTURE:BODY. Some 2020\-2025 Explorer vehicles equipped with a power roof opening panel may exhibit a sunshield with localized bunching or binding/inoperative. This may be due to a broken or missing sunshield fabric retainer/clip. A revised sunshield clip \(LJ6Z\-5452118\-B\) is now available to address this condition. It is not necessary to replace the entire sunshield assembly if the clip\(s\) are broken or missing. Refer to Workshop Manual \(WSM\), Section 501\-17 Roof Opening Panel \> General Procedures \> Inspection and Replacement of the Roof Opening Panel Shield Clip.
- [25M01](/bulletins/11035635.md), 2026-08-04, Other: ENGINE; UNKNOWN OR OTHER. Customer Satisfaction Program 25M01 Certain 2021 Model Year F\-150 3.0L Diesel Engine and 2020\-2022 Model Year Super Duty with 6.7L Diesel Engine Nitrogen Oxide \(NOx\) Sensor Replacement, If Required After Dealer Evaluation Reference: Emissions Recalls 22E02, 22E04, 23E01, and 25E09
- [PT\-26.25.5 F\-150](/bulletins/11035626.md), 2026-08-04, Over\-the\-air update: ELECTRICAL SYSTEM; UNKNOWN OR OTHER; FUEL/PROPULSION SYSTEM. 25S75 Recall remedy \-Powertrain Control Module update to introduce logic to prevent low pressure fuel pump binding and maintain fuel flow to the engine.

JSON: [/v1/bulletins/10184631](/v1/bulletins/10184631)

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