Truck Won't Start
 

ok guys i just got done installing my PPE race valve and my DSP 5 switch and now the truck will crank for a few seconds but then stops and won't start i have checked all my connections and i am getting a P0335 code coming up and i can clear it and it will come right back. i really need to get my truck fixed i need it everyday. oh and i have also did a complete reflash on the truck to make it back to stock thinking that it could be that and that didn't work. any kind of ideas

P0335 Crankshaft Position (ckp) Sensor Circuit (GM)

i'd look into that. make sure it is clean and plugged in and all.....

i'm sure some Duramax guys will chime in in a bit.....

P0335 Crankshaft Position Sensor A Circuit Malfunction

Hope this helps.

Josh

You beat me Ben.

ya i already got that one i have a book with all the codes in it but i am not sure if that is what is really going on with it but now sure, but thanks for the help

Uninstall the tune and return to stock. Reinstall the tune and make sure that you dont have ANY current draw whatsoever. i.e. dome light turns on, a/c running, stereo on, etc. You may also have your DSP5 switched installed wrong or not grounding properly.

i switched the wires on my DSP 5 switch like guy told me but when i log my truck i am still not seeing a different voltage when i switch it

Thats probably the problem. Sounds like its either not grounded correctly or one of the wires to the ECM is not in the right pin. Have you let Guy know that you switched it and there's no change in voltage? Keep in mind that these modern trucks use lots of voltage references that require grounding in the proper place. I feel pretty positive that may be you're issue.

well i just sent him a email so hopefully he gets back to me quickly

Did you go through the DSP tutorial from EFI Live?