Hey guys. I'm new to this forum. I bought my 2012 ram 1500 st , 5.7 L hemi with 122,000 kms on it. Today I was driving on the highway and looked and realized my truck was in 4th gear. I realized something was wrong and went home and parked it. I researched all day today and now know that it's in limp mode. The code I got when I turned the key three times was the P07590 code. So it probably is the transmission shift solenoid? I don't know where to start. I'm very short on money right now so I need the cheapest fix. I'm willing to try and change the solenoid if need be. I'm pretty confident I could change it myself with some instruction. I'm good at following YouTube videos to do things lol. How many people have gotten this problem and fixed it? I've read that it could be around 700$ to fix in a shop or more. I've seen rebuilt solenoids on eBay for around 120$. It may not even be the solenoid though so I really don't want to waste money. Should I get it scanned at a garage first? Please help! I've just got my license back after 3 years and planning to start a roofing company next month and now I've lost the use of my truck..