Sierra17

My issue did come back again after replacing the battery. It ended up being the entire headlight module! Such a disappointment, there was no way to replace just the turn signal portion. It is fully integrated into the module. I knew it wasn't the control module as I had swapped that from the other side. I finally replaced the entire module. It was the most expensive turn signal repair cost I've ever had.

Thanks for the suggestion! I had the battery tested today and it was BAD! I put a new battery in and so far the turn signal has been working, but it will take a few days to know for sure. Crazy that may have been it! I can't believe it was just affecting the signal on one corner.

I have a 2017 SIerra SLT that is out of factory warranty. It has the factory LED headlight/turn signal modules. The drivers side front turn randomly will not work. Sometimes it won't flash on lock/unlock from the remote, other times after I start the truck it won't flash. The rear drivers side and mirror led's do flash, just not the front. If I shut the truck off and start it up again that will normally fix it for a while. I swapped the headlight control module between sides and that didn't help. I haven't been able to reproduce the issue enough to test swapping the entire headlight modules between sides. Any thoughts on what it might be or other things I could try?