Nickmigues12
Junior Member
Hi all, have some issues on my truck and wanting to see if anyone has seen anything like this. So, a few months back I had a P26AB code kick on-pretty normal, especially because I had an aftermarket coolant valve on the truck. I ignored it for awhile while taking care of other stuff, and then the valve suddenly had some kind of short where it threw the truck into limp mode and wouldn't hardly run, until I unplugged the coolant valve altogether. I replaced the valve with a Mopar one, but the P26AB never went away. I wondered if I had somehow gotten a bad mopar valve, but now I'm starting to suspect that I may have a electrical issue instead. I noticed one day when messing with the coolant valve that I also had a P062A, which is a fuel pump control performance code- did some research and sounded like the code is basically triggered by fuel pump issues which I had no problem with as the truck has 200k on it now, so I threw a fuel pump at it, and that code is gone but now on top of the valve code i'm getting a P018D- fuel rail pressure sensor circuit high, which makes me wonder if I even had a fuel pump issue but oh well 200k i'll replace it lol. Anyways, curiously enough these codes are stored rather than active almost every time I look at them, so the issues seem super intermittent. Last week while driving the truck also randomly went into limp mode, which I was able to resolve by simply restarting the truck and it hasn't happened again, but when that happened I also had a stored camshaft position sensor code- don't remember what the exact code was and forgot to write it down and have since cleared it. So, long story short I think I have an electrical issue because the issues seem intermittent, and I noticed on wiring diagrams that the valve, the rail pressure sensor, both camshaft position sensors, along with the MAP sensor all share the same 5V reference wire, and the same sensor ground. But, electrical is not my strong suit so im doing some mental gymnastics- is it the 5V wire? is it the ground? Is one of those sensors going bad and starting to slowly cause issues? I have no idea, or where to even begin on how to find that.. when checking powers/grounds at the parts they all appear to be good, but with such an intermittent issue I don't know if i've ever tested with the problem even present. Did the good old fashioned wiggle tests all over the harness to no avail. Basically I've hit a brick wall and not sure what to look for at this point, hoping that somehow maybe someone out there has had the same or similar experience lol... thanks!
