So How do you make sure you’ll removing, and replacing, the right part? Well, in the example above, you can see that the BCM, pictured on the left, is both smaller and has different connector ports than the ECM, pictured at right. You may even be thinking to yourself, what’s the big deal, a control module is a control module! Not true, and not safe! Both modules have very distinct jobs, and misidentifying them can be harmful to your car’s electronic systems.
Upon first inspection, the BCM DOES look a lot like the ECM, which can lead to problems when it comes time to replace one or the other. The two most frequently replaced electrical components on a modern car are the ECM and another component that looks very similar, the Body Control Module, or BCM.
That can be costly and even potentially damage your car’s electronic systems, if you try to plug the wrong replacement part into a connector port! The fact is that, unless we have a detailed schematic of our car’s engine bay in front of us, a lot of the components may look very similar! In modern cars, so much of the actual working engine parts of covered in cowlings and plastic coatings, to help keep the interior of the engine bay looking tidy, that even the most seasoned DIY mechanic may have a problem identifying critical engine components. Today we want to take a look at one of the potential areas of concern for the do-it-yourself mechanic when it comes to replacing electric components on the car. If you’ve read any of our other posts, then you should be comfortable with the basic concept of an ECM. Engine Control Modules (ECMs) should be very familiar to you at this point.
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