3.5 LITER. code WXX0. A module in a vehicle used to monitor and control many components of the vehicle's engine management system. Catch Code-WXX0. Catch Code-WXX1. ECC. Engine Control Computer. Engine Control Module (ECM). Engine Control Unit (ECU). General Purpose Embedded Control Unit. MODULE - ENGINE CONTROL - EEC. PCM. Powertrain Control Module.