3990517RX | Genuine Cummins® ECM Electronic Control Module

Description and Purpose:

OEM ECM Electronic Control Module. Part Number: 3990517RX. Brand: Cummins. Condition: New. This engine control unit is engineered for managing fuel injection, timing, and system diagnostics across Cummins-powered industrial equipment. Specifically compatible with ISB 5.9L, ISB 6.7L, QSB and ISC 8.3 engines, it fits select Hyundai forklifts, wheel loaders, and crawler excavators. Designed for high-load environments, this ECM ensures efficient communication between engine systems for consistent operation in construction and material handling applications. Cross reference: 3990517, 3990517NX

Why Replacement is Important:

A malfunctioning ECM can cause erratic engine behavior, failed startups, or inaccurate diagnostics. Replacing it restores control over key engine systems and prevents costly downtime.

Impact on Vehicle Performance:

Reinstates fuel efficiency, smooth engine response, and accurate control over powertrain components—crucial for machines operating under continuous heavy-duty cycles.

Manufacturer Information:

Cummins® is known globally for advanced diesel engine systems and electronic modules built to meet strict OEM requirements for industrial and commercial equipment.

Tags & Category: ECM module, electronic control module, Cummins ECM, engine computer, engine control unit, fuel injection control, Hyundai forklift ECM, wheel loader ECU, excavator electronic module, ISB 5.9L, ISB 6.7L, QSB 3.9, QSB 4.5, QSB 5.9, QSB 6.7, ISC 8.3, G8.3 CM550, CM850, CM2250, industrial equipment ECM, heavy machinery ECU, construction vehicle control module

Warranty:

Parts Finder Q offers a 365-days warranty for all types of parts in any condition. The -warranty applies exclusively to purchases made directly through our website (partsfinderq.com). Please note that purchases made through third-party platforms like eBay or Amazon are not covered by this warranty.