{"nhtsa_id":10215977,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-07-18","date":"2013-05-10","document_id":"21-004-13","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM; POWER TRAIN","mfr_system":null,"summary":"Flash: Drivetrain Control Module (DCTM) - Transfer Case Operational Enhancements This bulletin involves flashing the Drivetrain Control Module (DCTM) Owners may indicate that they have experienced one or more of the following symptoms:Moaning or groaning noise while coasting and/or during a very light acceleration around 5 to 8 mph (8 to 13 kph).The SERV 4WD message appears and the vehicle shifts from 4WD to 2WD.Binding of the front driveline while turning on steep grades at speeds around 3 to 5 mph (5 to 8 kph).Surge/Shudder at speeds greater than 50 mph (80 kph).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10215977-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10215977-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10215977","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"DODGE","model":"DURANGO","year_from":2011,"year_to":2011,"match":"exact","vehicle_ids":["2011_dodge_durango"]},{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2011,"year_to":2011,"match":"exact","vehicle_ids":["2011_jeep_grand-cherokee"]}],"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":[]}