Expert Pro Tip
Expert Pro Tip
Before condemning your BCM, always perform a full battery and charging system test. The GMT360 platform (Envoy, Trailblazer, etc.) is notoriously sensitive to low voltage. A weak battery or failing alternator can cause symptoms that mimic a bad BCM. Also, check the main ground connections under the hood and on the frame for corrosion. A simple cleaning can sometimes solve a world of electrical headaches and save you from replacing a part that isn’t actually bad.