Shop new and used Caterpillar C7 Engine Control Modules (ECM) on MyLittleSalesman.com . Compare active listings with prices from $150 to $2,000. Sellers include CA Truck Parts, JJ Rebuilders, Boots and Hank's Truck Parts, and more. Filter by condition, price, or year to find the Caterpillar C7 Engine Control Module (ECM) that fits your job.