{"nhtsa_id":10181869,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-11-04","date":"2020-10-16","document_id":"SSM 49099","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10181869-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10181869-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10181869","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"transfer-case","name":"Transfer case","parent":"powertrain"}],"codes":[],"topics":[],"vehicles":[{"make":"FORD","model":"F-150","year_from":2019,"year_to":2020,"match":"exact","vehicle_ids":["2019_ford_f-150","2020_ford_f-150"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}