Focus on Autoparts & Modification Solutions. ECM ECU Diesel Engine Computer Module 3408501 For Cummins ISM11 M11 QSM11 QSX15. ?? What do we sell? ECM ECU Diesel Engine Computer Module For Cummins ISM11 M11 QSM11 QSX15. For CUMMINS ISM11 M11 QSX15 QSM11. 1x Engine Computer ECM ECU. If you have any questions about the product or compatibility, we’d be delighted to hear from you. Thank you for your understanding and support. Please provide a complete physical address when ordering. We do not accept PO BOX or APO/FPO addresses, as couriers do not transport packages to these locations. We believe you’ll be pleasantly surprised. We shall address your concerns promptly and provide a satisfactory resolution. We work from Monday – Saturday 8:30AM – 7:30PM, but we will reply once we get your message. We will be very honored to provide you with quality service. We will try our best to resolve any kind of issue.