Hello, I am hoping someone else has had this issue. I have a 2015 Chevy Camaro 2SS.
My car has been in and out of the dealership and other mechanic shops for the same issue for over a year and tired of spending a lot of money on this issue and no one has fixed it.
When my car is cold, it starts with zero hesitation. But when its hot and go to start it, it struggles Almost doesn't want to start, but it does. Yes, I've changed out the battery, alternator, starter and crank shaft sensor. No change.
After this struggled start, the check engine light is on, most of the time flashing, engine running ruff, like a misfire and all my tracktion control lights are all luminated. After a day or two, the problem goes away until the next time I start my car while it's hot.
Shops also changed out my computer, crank shaft, spark plugs, coil packs and lifters.
I have codes:
P015B
P0204
P0300
P0336
P0202
P0300
Also Seivice StabiliTrak is showing on my display.

 

This happens when it is wet, dry or anytime outside?

2 of the codes are specific to cylinders 2 & 4 can you try to move those injectors and see if the code follows the injectors? If so those injectors may be the issues.

Fuel pressure test while it is acting up? Fuel pumps can drop ProFormance as it get hot. The computer map assumes the fuel pressure is within spec. This can cause the computer to overreact and cause all kinds of issues.

Do you have access to a scanner? We need to know if the engine starts running bad when the engine goes into close loop. If you do not have a scanner you could try to unplugging the MAF sensor and see if the engine runs better after it starts running bad.

What you described would be text book bad ground. Gets worse hot, effecting different systems. If I was at the dealer and was having trouble figuring this out before I called GM tech support I would use jumper wires from the battery to the engine, from the battery to the firewall and from the battery to the computer ground. I did that because I knew it was the first thing tech support would say to do it. That does not mean that is what it is just I assumed that really hard to figure out the issue is the ground is not 100%. Without a high grade scanner it will be tuff to track down. The only other thing you could try is moving the harness around while it was running bad to see if you have a bad connector or wire.

I have not heard of this exact issue. Be careful with someone saying "this happened to me and it is this". Unless there is like 10 other people right behind him saying me too then there are dozens of things that could cause what is happening. GM puts out bulletin for known problems and it take either a measurable problem or 100's of people with the exact same problem. When I worked at a very larger dealership we knew most of the issues before a bulletin was even made. If we knew at a single dealership there must have been 1000's of issues across the country. If you have a GM log in I think you view all bulletin related to your car.

 

I did forget to mention that I did replace the injectors. There may be a few other things I forgot.
I think I will start with the fuel pump next. I didn't think of that. Easy to replace. If the pump doesn't help, I will move on to the next recommendation. Thank you for all your insight and recommendations on all of this.

 

What you are doing I like to call a parts grenade. That is when you throw parts at a problem without checking it. You can just borrow a fuel pressure gage from almost and chain parts store. If the car is acting up you can check it in the parking lot. The reason parts grenades are bad is there are defective parts and people make mistakes installing them. In some cases connectors can break internally or a whole list of other things can go wrong. Every time you change a part the chances you will create another issue goes up. Multiple issues can make tracking down an issue exponentially harder to find even for a good tech. For me the worst thing was getting in a car with a drivability issue, popping the hood and seeing a bunch of new parts. I used to love a challenge but that used to make me want to punch out for the day and go home. Finding what something that has naturally gone wrong and finding something that had help from a human was a whole other level. That was as bad as getting a car off the truck that never work right. See most trouble trees are designed with the assumption that the system has one issue and that issue was cause by a failure not a miss installed part.

As a GM tech I had known good parts I used for testing. This allowed me to figure out if I had a wiring issue or a sensor issue pretty quickly. When I first started as a tech I fell into that that "if the part is new it must be good" trap. I had a car come to me once that had an injector error. All the injectors were replaced so that was not it. I crawled all over that system. After 8 hours I replace the injectors again. It was fixed. So I took out a bad injector and one of the new injectors was bad.