Okay well unfortunately I have a glowing yellow check engine light and about 4 DTC's. I looked them up, one is for over boost, one is for high rail pressure, makes sense because I have chips and they probably threw the code. Anyway the other two I'm a little confused about, I don't know exactly what they are trying to tell me so I'm looking for help. The first is P2508 ECM/PCM Power Input Signal Hi. The second is P2121 Throttle/Pedal Pos Sens/Switch D Circ Range/Perf. Any clarification would be greatly appreciated. Thanks.

 

The first thing you need to do is remove all the "chips", clear the codes and see what comes back. After that you can work the problems without the outside influences of the other performance enhancers.

 

Yeah that was the plan of attack I just want to know what exactly do those DTCs mean in plain English?