P050B

[zmwatson18]

So about a month ago my truck had a CEL go on, I stop by AutoZone and they scan it and say it's P050B Cold Start/Rough Idle, I put in some new gas, planned on making an appointment the next day and that morning the light went away and it's been driving fine, until I go to work a few days ago. It was fine driving to work and the whole time leading up to this point, then I go in for my 8 hour shift from 0000-0800 and it's been cold out that night (around 35-45F) and that morning I get in and the light goes on. I scan it the next day and it's the same code.... Yesterday I put in some Lucas injector cleaner and some 89 Octane from Shell as I usually use 87, still from shell, but I'm hoping a slightly higher Octane and the cleaner help some.

 

I made an appointment with the dealer, but their earliest appointment isn't until December (seriously WTF), so fingers crossed. The last few codes it's had have solved themselves basically. 

 

Is it just picky on gas and doesn't like the cold?

[TJay74]

There are 2 causes for that code, you either got one of the engines that had some failed head gaskets or the more than likely culprit which is a bad injector(s). The tech has a test they can do to determine which injector it is that is popping the code. Typical repair is to replace that 1 injector only.