{"nhtsa_id":10128966,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-02-21","date":"2013-02-28","document_id":"25-002-13","mfr_campaign":null,"replaces":null,"component":"FUEL SYSTEM, DIESEL","mfr_system":null,"summary":"MIL Illumination Due To P1C56 - NOx Sensor Intermittent - Bank 1 Sensor 2 This bulletin involves verifying excessive Diesel Exhaust Fluid (DEF) deposits in the decomposition tube collected and if present, replacing the Catalytic Converter Shield with a ?clam shell? shield with a metal exterior.This repair is to be performed in addition to diagnostics available in DEALERCONNECT > Service > Repair Information > TechCONNECT > 28 - DTC-Based Diagnostics > MODULE, Powertrain Control (PCM), DD/DP - Chassis Cab > Diagnosis and Testing > P1C56 - NOx SENSOR INTERMITTENT - BANK 1 SENSOR 2 Customer may experience MIL illumination. Further investigation by the technician may find P1C56 - NOx Sensor Intermittent - Bank 1 Sensor 2 is set active or stored.This condition may be caused by insufficient heat retention in the exhaust at or near the DEF doser.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10128966-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10128966-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10128966","components":[{"id":"fuel-system","name":"Fuel system","parent":null}],"codes":["P1C56"],"topics":[],"vehicles":[{"make":"DODGE","model":"RAM 3500","year_from":2011,"year_to":2011,"match":"base","vehicle_ids":["2011_dodge_ram"]},{"make":"DODGE","model":"RAM 4500","year_from":2011,"year_to":2011,"match":"base","vehicle_ids":["2011_dodge_ram"]}],"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":[]}