This is a used genuine Cummins 4921776 Electronic Control Module on the CM850 control platform, used across ISB6.7, ISC, ISL, QSB6.7, QSC8.3, and QSL9 engines. The ECM manages fuel injection timing and quantity, engine protection, emissions control, and J1939 communication with engine sensors. This unit is sold strictly as-is with unknown working condition for parts, bench testing, or diagnostic use only — no warranty included. Programming Note Cummins ECMs require programming via Cummins Insite using the engine serial number, VIN, and CPL/arrangement number before the engine will run correctly. This unit ships unprogrammed and must be programmed by a qualified Cummins dealer or technician with current Insite access. Always verify your CPL and ESN match this module before purchasing. Signs of a Failing ECM Engine entering derate or limp mode with no clear sensor fault Intermittent or unexplained check-engine lights and fault codes Hard starting or no-start with normal fuel pressure and injector function Erratic throttle response or sudden loss of power under load Multiple unrelated fault codes appearing simultaneously Loss of communication between ECM and diagnostic tools over J1939 Specifications Manufacturer Cummins Part Number 4921776 Part Type Electronic Control Module (ECM) Engine Platform Cummins CM850 Weight 4.65 lb Condition Used / as-is — unknown working condition Warranty None — sold for parts or testing only Core Charge None Cross References This module is equivalent to or supersedes the following part numbers: Cummins: 4921776, 4921776RX (reman), 4921776NX (new), 700056AT Applications The 4921776 ECM fits CM850 platform engines used across on-highway and vocational applications: Cummins ISB / ISB6.7 (CM850, 2002-2008) Cummins QSB6.7 (CM850 / CM2850) Cummins ISC / QSC8.3 (CM850) Cummins ISL / ISL9 / QSL9 (CM850) These engines are found in medium-duty and Class 6-8 trucks, school buses, motor coaches, and vocational equipment from Freightliner, Kenworth, Peterbilt, International, Volvo, Thomas Built, and Blue Bird, among others. Related parts: Cummins 4921517 Oil Pressure Sensor for ISB, ISX, ISM Sold as-is for parts, bench testing, or diagnostic use only. No returns. Always verify engine serial number, CPL, and control system version before purchasing. Cummins Insite programming is required before installation.
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