{"nhtsa_id":10136964,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-05-21","date":"2014-02-19","document_id":"21-006-14","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Flash: ELSD Module Enhancements This bulletin involves selectively erasing and reprogramming the Electronic Limited Slip Differential (ELSD) with new software. If any of the following DTC?s are either Active or Stored in the ELSD module?s memory, the ELSD motor will need to be replaced as well. C1490-00-REAR DIFFERENTIAL ACTUATOR INITIALIZATION FAILURE C148F-1D-REAR DIFFERENTIAL MEASURED MOTOR - CIRCUIT OUT OF RANGE C1489-96-REAR DIFFERENTIAL MOTOR BRAKE - COMPONENT INTERNAL FAILURE The customer may indicate that their 4X4 lamp may be flashing (indicating a malfunction of the 4X4 system).In addition, one or more of the following Diagnostic Trouble Codes (DTC) are Active or Stored in the ELSD control module?s memory. C1490-00-REAR DIFFERENTIAL ACTUATOR INITIALIZATION FAILURE C148F-1D-REAR DIFFERENTIAL MEASURED MOTOR - CIRCUIT OUT OF RANGE C1489-96-REAR DIFFERENTIAL MOTOR BRAKE - COMPONENT INTERNAL FAILURE","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2014/MC-10136964-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2014/MC-10136964-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10136964","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"engine","name":"Engine","parent":null}],"codes":["C1489","C148F","C1490"],"topics":[],"vehicles":[{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2014,"year_to":2014,"match":"exact","vehicle_ids":["2014_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":[]}