sorry for digging up an old thread but my buddy has been having this code for quite some time so I'm trying to help him with it. He has an 06 vin 2 and has been getting this code on the stock tune only while towing when it's hot out. I've yet to log it and see exactly what happens with his pressure when it sets the code. We replaced the fuel line by the tranny and tomorrow I'm going to bottle test his fprv. I want to see what his desired and actual pressures are and something I wanted to log and test is to turn limp mode off and let it set the code and see if the pressure dips and recovers immediately or if the pressure stays below desired. I'm just wondering how safe it would be to disable limp mode or turn this code off?
This code is so widespread and so often not fixed that it makes me wonder if people aren't entirely on the wrong track. I've read where cp3's, injectors, fprv's, and lines have been replaced along with adding lift pumps and they still get this code. Makes me wonder if this isn't an ecm issue or something. I read a thread where someone logged it and their desired pressure was 33k. My understanding is that the CP3 can only make 26K correct?