2WD. 4.6 Liter. 5.4 LITER. federal. A module in a vehicle used to monitor and control many components of the vehicle's engine management system. Calif. Catch Code-NBE8. Catch Code-TBH9. Exc.Calif. ECC. Engine Control Computer. Engine Control Module (ECM). Engine Control Unit (ECU). General Purpose Embedded Control Unit. PCM. Powertrain Control Module.