{"nhtsa_id":10166575,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-10-28","date":"2019-08-01","document_id":"08-041-19 REV. A","mfr_campaign":null,"replaces":null,"component":"SUSPENSION","mfr_system":null,"summary":"Flash: Air Suspension Control Module (ASCM) Updates This bulletin involves reprogramming the ASCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:C220C-48 - Active Suspension Module Internal-Supervision Software Failure. C211B-92 - Ignition Run/Start Input-Performance Or Incorrect Operation. C156C-7A - Ride Height System Air Leak-Fluid Leak Or Seal Failure. In addition the customer may describe:Excessive operation or noise from air suspension system when vehicle is stationary. \"Air Suspension Disabled\" message when attempting Bed Lowering Mode (BLM). Excessive compressor valve cycling following a cold start(Diesel engine only). Erroneous \"Bed Low Achieved\" message through the Instrument Panel Cluster (IPC), when requesting lowering, even though the truck didn't physically lower. Ride height changes/valve actuations without operator request on rough roads.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10166575-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10166575-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10166575","components":[{"id":"suspension","name":"Suspension","parent":null}],"codes":["C156C","C211B","C220C"],"topics":[],"vehicles":[{"make":"RAM","model":"2500","year_from":2019,"year_to":2019,"match":"exact","vehicle_ids":["2019_ram_2500"]},{"make":"RAM","model":"3500","year_from":2019,"year_to":2019,"match":"exact","vehicle_ids":["2019_ram_3500"]}],"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":[]}