I have started getting an error code P1604 Startability Malfunction on my 2013 Tundra. I cannot find a good explanation of this code. My battery was rundown from working on my lights and I thought this must be the issue. I charged the batter and cleared the code. I started the truck this morning with no trouble but the code is back. Something I read said not to worry about it but I am kind of OCD and can’t do that. Anybody have any suggestions or ideas?