Morning all! I'm having a pretty consistent issue now with going in and out of limp mode on acceleration (generally hard acceleration onto highway). The first two times weeks ago caused the car to go in to limp mode for a short time, but resolved itself. The only code that showed up the first two times were pending P0001. Now yesterday, the car was going in and out of limp mode the entire time I was trying to get up to speed on the highway. It would resolve itself as long as I went easy on the gas, but at any time the rest of the trip I accelerated any harder, same limp-mode issues. Got home and scanned and it shows P0001 but also P306F, both as pending.

I've seen a few mentions in other threads of it potentially being the HPFP, but I had that replaced about 20k miles ago (at 60k miles) under the extended warranty. Is there anything else that P306F would give hints to as an issue? I'd love to check out potential issues before I bring it on down to my mechanic. Thanks for any help!

 

I had a P0001 pop up recently when starting the car with the HPFP disconnected. This was consistent with the code description in the service manual, "open circuit on fuel pump" or something along those lines.