4.8. 5.3 & 6.0 LITER. A module in a vehicle used to monitor and control many components of the vehicle's engine management system. New. Part listed is for remanufactured unit. Part numbers are for remanufactured assemblies, Contact local dealer for possible core charge and exchange information. Software Level 8.10 X. ECC. Engine Control Computer. Engine Control Module (ECM). Engine Control Unit (ECU). General Purpose Embedded Control Unit. PCM. Powertrain Control Module.