2 0 Cummins ISB 5.9L Engine Control Module (ECM) for a Cummins ISB5.9 $450 USD Good used, cleaned, tested and inspected Cummins ISB5.9 ECM. Part number: 3990517 30 day guarantee for swap or refund if not programmable. ECM's need to be programmed to your application Quantity2ConditionUsedFits To Make(s)CUMMINSFits To Model(s)ISB5.9Part Number3990517Stock NumberRyd 3990517 MLS Number13644587CategoryEngine Control Modules (ECM) Last Updated11/7/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info