Cummins Engine Harness Repair Kits

Worn, corroded, or heat-damaged ECM connectors are one of the most common electrical issues on Cummins-powered heavy-duty trucks. These failures cause intermittent sensor faults, J1939 communication errors, gauge problems, and expensive downtime. Replacing the entire engine harness is costly and time-consuming.

Kustom Truck Parts offers targeted Cummins engine harness repair kits that fix the problem at the connector level. Each kit uses genuine OEM plugs and high-quality components so you only replace what’s damaged, saving thousands compared to a full harness.

We stock repair kits for every major Cummins ECM generation:

Celect Plus – 21 Pin Round OEM Option Connector
CM570 – 50 Pin ECM & 31 Pin Round Option Connector
CM870 / CM871 – 50 Pin ECM & 4 Pin ECM Power Connector
CM2250 – 60 Pin ECM OEM Connector
CM2350 / CM2450 – 96 Pin ECM OEM Connector

Each Cummins engine harness repair kit includes:

Genuine OEM connectors with gold-plated terminals
Pre-crimped 18" GXL copper wires (color-coded)
J1939 CANbus cable and J1587 twisted-pair datalink wires
Cavity plugs and all necessary seals

These kits are ideal for Freightliner, Western Star, Peterbilt, Kenworth, and other popular chassis — perfect for both routine maintenance and engine conversion projects.

Browse our full selection of Cummins engine harness repair kits below and choose the kit that matches your ECM generation and connector type. Not sure which connector you need? Send us your engine serial number or a photo of the damaged connector.