Replaced the thermostat this past week well doing so I noticed the serpentine belt had some significant damage so I changed it & also the tensioner pulley. Got everything back together & started it right up with no issues or noise. Had to go help family which is approx 60 miles both ways, done multiple other stops with no issues what so ever untill I finished my last stop, got in the car to come home & it will only crank. I've checked my fuel pressure which is fine, replace the crank sensor, checked every fuse & relays all the other sensors & wiring all good i was almost positive it was a bad fuel injection pressure regulator because I was able to spray some starting fluid in the small hose & she started up like normal but didn't stay running so i replaced the regulator but still no start its definitely getting fuel.oh & the reduce engine power light has been on sense this started which has never been on sense I've owned this envoy. I'm lost Help please
RepairPal Certified shops can diagnose and repair your 2004 GMC Envoy XL. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I’m sorry to hear you're having trouble with your vehicle.
It sounds like your Envoy may have an issue with the electronic throttle control system. The "Reduced Engine Power" light is a clue that there might be a problem with the throttle body, wiring, or throttle position sensor (TPS). If there’s a malfunction in these parts, the engine may crank but won’t stay running. I’d suggest inspecting the throttle body for carbon buildup or loose connections. Also, make sure the throttle body wiring is secure. If that looks good, checking for any trouble codes with an advanced scan tool could help identify specific issues with the throttle or other sensors affecting the start.
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