Electronic control unit

An electronic control unit comprising:

• a housing including a body and a cover, the body formed from a thermally conductive material and defining a cavity therein;
• a first printed circuit board assembly and a second printed circuit board assembly, the first and second printed circuit board assemblies disposed within the cavity of the body;
• and
• a passive thermal control system comprising:
• a first thermal interface material positioned between the first printed circuit board assembly and the second printed circuit board assembly;
• a second thermal interface material positioned between a heat-generating part of the second printed circuit board assembly and a first portion of an interior surface of the body;
• and
• a third thermal interface material positioned between, and in contact with each of, the first printed circuit board assembly and a second different portion of the body,
• the first thermal interface material, the second thermal interface material, and the heat-generating part being axially aligned with one another and each having a footprint that is substantially the same.