An electronic control module includes an EMI baffle in the form of openings formed in laterally spaced portions of the cold plate supporting the electronic circuits. Preferably, upper and lower plates of the cold plate define a limited access baffle chamber with openings that require rerouted travel of any leakage radiation emanated by terminals or conductors carried by couplers inserted into the cold plate openings or passing through the openings. Preferably, each coupler is inserted through openings having an inlet axis in the cold plate and the module packaging covers are secured to the cold plate between an inlet and an outlet opening in the cold plate. Accordingly, simple gaskets may be used to seal the covers against the cold plates and the couplers against the cold plate. Moreover, the cold plate coolant passage has inlets and outlets that remain exposed exteriorly of the covers to avoid exposure of the internal circuitry to leakage.