CM870/CM871

Damaged or corroded ECM connectors on Cummins ISX engines running CM870 or CM871 electronics lead to intermittent fault codes, unreliable sensor data, and unexpected derates. The 50-pin ECM connector is especially prone to heat-related pin degradation over time.

Kustom Truck Parts offers CM870/CM871 Cummins engine harness repair kits that address the failed connector without requiring a full harness replacement. Each Cummins connector repair kit ships with genuine OEM plugs, pre-crimped 18" GXL copper wires, J1939 CAN bus cable, twisted pair datalink, and cavity plugs for unused positions. Kits cover the ECM OEM engine-to-cab harness connector so you can target the exact point of failure.

These kits fit Freightliner, Western Star, Kenworth, and Peterbilt applications in both OEM repair and conversion scenarios. Browse below to match your connector, or contact our team with your engine serial number.