Caterpillar C15, ECMs, (TESTED W/ WARRANTY) Caterpillar C15 MXS ECM For Sale, 120-PIN, Personality Module Part # 2647707-00, MXS-Serial, MXS/NXS Compatible, Pulled off CAT C15, Engine Serial # MXS28046, ECM Serial # 06956489JX, Stock # 6754