Gr8g
Junior Member
Hello, new to this forum and Ram family. I recently purchased a 2018 Ram 2500 with a 6.4L and 105k Km. Since purchasing it has been in shop. Shortly after the purchase the check engine light came on. I took it right back to dealership and they looked it over. They had the truck for a week trying to resolve the issue. I was told the truck was fixed. I was told that fuel pressure was to low 10psi. So, they ended up replacing the fuel pump and pressure went up to 50psi which I was told was normal. The fault codes were cleared and the truck was driven by mechanic and salesman for awhile. It was declared fixed. I went to pickup the truck and when I turned it on the CEL came back on. I took the truck home for the night. While at home I put my code reader on it and got a P0171 P0174 and P0128. Can the P0128 be related in any way to the lean codes? The P0128 is a thermostat sanity check I believe so don't see how they can be related.