With Halloween just having passed, we couldn’t resist spotlighting this recent case study from our old friend Michael from Utah. This one is a great tutorial on using your system knowledge and vehicle-specific knowledge to quickly and accurately diagnose an electrical system issue that was wreaking havoc on a 2009 Chevy Equinox.
Michael laid out the issue as follows: “[After the shop performed what they believed was the key repair]… the vehicle would run correctly for about 10 minutes then the Instrument Cluster would light up like a Christmas tree. When this happened, there would be no CAN communication across the Bus. When querying modules with the scan tool, every one of them reported no comms. Something was bringing down the Bus.”
He goes on to show how he solved the issue, pointing out how he used his knowledge of this specific CAN Bus design to avoid pitfalls and confirm his diagnosis. He also relied on his experience that told him to zero in on the EBCM, which was echoed in the comments section as a common culprit.
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