5.4 LITER. Catch Code-ZTU0. code XKB0. code ZTU0. ECM. A module in a vehicle used to monitor and control many components of the vehicle's engine management system. Catch Code-XKB0. Catch Code-ZTU0. ECC. Engine Control Computer. Engine Control Module (ECM). Engine Control Unit (ECU). General Purpose Embedded Control Unit. MODULE - ENGINE CONTROL - EEC. Powertrain Control Module.