Allen120

Ok thank you

Does the mpg part still work or do I need to get that turned on

I got the switch that came with the harness the code was for coolant temp sensor and cleared it but no change for fast idle warm up ok I bought it from Moparman

I have no way to read the codes And yes I was switching the modes with the switch he provided

now have the harness in and I got a check engine light and a little drop in rpms into 6 cylc mode and then in 3 it almos like u bump the key in the truck and as soon as it's switched into the 3cylc and cut the fuel for a half a second and runs normal

Does the Moparman harness need 12 volts since I have not seen any videos with people hooking up 12volts