Dead Fuel Door: Failed Lock Actuator vs. Release Cable Fix

Had the exact same issue on my 2005 Chevy Trailblazer last winter. The electrical fault turned out to be a failed release mechanism actuator, not just the cable. The main symptoms matched yours, no response from the release button or key fob, plus other electrical gremlins. The repair needed a complete actuator replacement since the internal motor had burned out. It wasn't just the linkage, the whole unit was toast. While not a critical safety issue, it's definitely something that needs fixing since you can't fuel up properly. Quick tip: Until you get it fixed, there's usually an emergency manual release cable behind the trunk panel. You might need to pull back some carpet to access it. Based on the symptoms, I'd bet you're dealing with the same actuator failure. It's a known weak point on these models, especially as they age. When the motor dies, it often causes those error codes you mentioned.

Thanks for that detailed explanation, sounds exactly like what I'm dealing with! It's such a relief to hear someone had the same issue fixed successfully. Before I book it in for repairs, I'm curious how much the actuator replacement set you back? Also wondering if you've had any other electrical issues pop up since getting it sorted? The error codes have me a bit worried there might be more going on with the electrical system.

Just got back from having mine fixed last month actually. You'll be glad to hear the fuel flap release is working perfectly now. The issue was exactly what I suspected, the electric actuator was completely burned out, just like I mentioned before. The total repair came to 210 for the new release mechanism and labor. Completely worth it for having a properly functioning fuel filler door again. No more awkward gas station moments! Best part is, all those electrical fault codes cleared up right after the repair. Haven't had a single electrical issue since they replaced the actuator unit. The mechanic mentioned these units often trigger unusual error codes when they fail, but fixing the core problem usually sorts everything out. Makes sense in hindsight, the faulty release mechanism was causing the system to throw those codes because it couldn't complete its operation cycle. Once that was fixed, the whole electrical system went back to normal.

Thanks everyone for the help! Finally got this sorted out last week. Took it to a shop and just like you all suggested, it was the actuator that was fried. The mechanic confirmed the electrical fault was triggering those weird codes. Repair cost was pretty close to what others mentioned, paid 225 for parts and labor. The best part? All those error codes disappeared as soon as they put in the new release mechanism. Such a relief not having to mess with that manual cable release anymore when filling up! The fuel door pops open perfectly now with both the interior release button and key fob. Really glad I checked here first, saved me from getting the runaround at different shops about what needed fixing. Good to know these electrical issues were just symptoms of the bad actuator and not something more serious.