No spark no dlc communication

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! You've been through quite the parts catalog with your Tahoe, and it sounds like you're dealing with a real head-scratcher. If there's no spark and no communication with the DLC (Data Link Connector), it might be an electrical issue affecting both the ignition and the onboard diagnostics. Double-check all the fuses and relays related to the ECM (Engine Control Module) and ignition system. A faulty ground or a short in the wiring harness could be the culprit, especially if it died while driving. It's like trying to watch TV with a frayed power cord—nothing's getting through. Also, ensure the ECM is getting power and ground, as a lack of communication could indicate it's not booting up properly. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.