Codyboy

I have the following codes and wondering what you guys think, I thought maybe 2146 or 2149 would mean a bad injector possibly but not both. As well 2509 could be related but dont know. I thought maybe a bad alternator could be it but seems to be charging fine just a little noisy. I have read a few posts but not sure where to start and if they could share a common problem.
P0633 SKIM Key Not Programmed in PCM
P2146 Fuel Injector Group 1 Supply Voltage Circuit
P2149 Fuel Injector Group 2 Supply Voltage Circuit
P2509 ECM/PCM Power Input Signal Intermittent

Thanks

bob4x4

Are you using a box that ties into the injector harnass ?

rip 112

Bad injector, probably #3 or #4. My friend just had his #4 injector replaced and he had those exact codes. My ? is the truck running rough?

Codyboy

nope the truck runs pretty good. No noticeable smoke. I did notice that sometimes it likes to idle around 1000 rpms and then it will idle around 800 little later

How can i check the injectors?
Not sure what you mean by a box that ties them together

05CTDN8

Are yo using an MP-8, TST, EDGE, ........

Codyboy

opps read that wrong. I never used a chip on it. I have only had the truck for a week so cant say what the other owner did but it looks like there wasnt one on it. But there are a couple wires i dont know what they are for and they are not original and are integrated with the harness on the drivers side

Codyboy

seems like i am getting crappy mileage. Anyone know how to check to see if the injectors are bad? Never done it so a write up would be awesome