Andy H

So, do I need to replace the PCM?

Hello everyone! I recently had a check engine light come on after filling up my truck with gas. It is a 2008 Silverado with a 5.3l LY5 J code with 190,000 miles. The codes I am getting are P069e and P0606, (which have to do with the Fuel Pump Control Module). My truck is running perfectly fine though, no problems at all. I started using my Blue Driver obd2 scanner to log data to help troubleshoot, because the codes would instantly come back as soon as I clear them. I was monitoring my fuel pressure and noticed it was running around 88 to 92 psi range according to my Blue Driver. I kept driving the truck since it was running great and would occasionally monitor the fuel pressure for any changes. I noticed that once my fuel tank got down towards 1/2 a tank, The fuel pressure dropped to around 42 psi. At this point, I was able to clear the codes and the check engine light would stay off. As I continued to drive the truck, the fuel pressure stayed around 42 and the check engine light stayed off. When the fuel level got down to around 1/8 of a tank, I stopped and filled up the fuel tank. As soon as I started the truck up while at the gas station, the check engine light came back on, and the fuel pressure went back up to around 92 psi. Truck still runs good though. Any ideas what would be causing this to happen? Thanks! Andy

Before: 2008 silverado Z71 5.3 with 3.73 gears and G80 locker 6" fabtech lift with moto metal 962 wheels 35/12.50/20 terra grapplers After: