Is Your SUV Exhibiting These Telltale Signs?
Real-World Repair Story
A customer brought in a 2002 Chevy Trailblazer that was driving him crazy. It would run perfectly for days, then suddenly refuse to start. He’d already replaced the battery and starter to no avail. When I got it in the bay, it started fine, of course. After hooking up my diagnostic scanner and monitoring live data, I noticed a momentary voltage drop within the PCM’s internal processor during a wiggle test of the main harness. These early GMT360 platform PCMs were known for developing microscopic cracks in the circuit board or failing capacitors after years of heat cycles. We installed a VIN-programmed 2002 Envoy PCM, performed the security relearn, and the intermittent no-start issue was gone for good. It’s a classic case where swapping parts randomly costs more than proper diagnosis.