Service bulletin SSM 49099
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 | 10181869 |
| Published by NHTSA | 2020-11-04 |
| Manufacturer's number | SSM 49099 |
| Manufacturer's date | 2020-10-16 |
| NHTSA component | POWER TRAIN; POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE) |
NHTSA's summary
2019-2020 F-150 vehicles equipped with four-wheel drive (4WD) have a revised transfer case control module (TCCM) strategy that will affect integrated wheel end (IWE) operation after initial start-up. The TCCM will not energize the solenoid to supply vacuum to the IWEs after the initial key cycle and a driven gear is selected. The IWEs will remain engaged for 0.8 km (0.5 mi) when the temperature is above 0 deg C (32 deg F) and 3 km (2 mi) when below 0 deg C (32 deg F). The strategy changes were implemented to improve vacuum supply management and axle warm up in cold temperatures. The engine must run for a minimum of 5 minutes to build sufficient vacuum before performing any vacuum related testing. Refer to the Workshop Manual (WSM) Section, 307-08A > Four-Wheel Drive Systems > System Operation and Component Description for additional information.
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, Transfer case
| FORD F-150 | 2019, 2020 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.