Need some help. 2014 Buick Verano, receiving codes P00C6 and P228C.

[TheSoggyDollar]

2014 Buick Verano 2.4L
100,000 miles, almost on the dot

I’m having a difficult time resolving this one. I’ve likely done several unnecessary things too but figured I’d just work through some checklist items. Here’s the scoop:

Currently the car will have a difficult time starting up unless I give it some gas. Once started, I generally need to feather the pedal a bit to prevent it from stalling. After about 20 seconds or so, RPM’s plummet, and I have to give it a few good pumps to keep it afloat. Once i do that, its almost like all the issues are gone. I can comfortably let the car idle without any feathering, and it doesn’t stall in park anymore. Downside is, the car goes into, “reduced engine mode” and the car won’t go over about 40mph.

So here’s what I have replaced recently:
- Camshaft Position Sensor
- VT solenoids (both)
- High Pressure Fuel Pump
- Fuel Pressure Sensor (on fuel rail)
- TPS (pedal)

Additionally:
- Cleaned & drilled out the small orifice on the inside of the intake.
- Cleaned all electrical connections

With regards to electrical connectors, everything seems okay. It looks like the two connectors to the VT solenoids are busted to an extent - that extent just being that they don’t snap in place, but otherwise they appear fine.

Looking for anything that could explain the codes. This one seems to be a doozy.

 

[MelsRegal]

Have you done a fuel pressure test?

 

[TheSoggyDollar]

Have you done a fuel pressure test?

Actually yes. Used a test kit from Harbor Freight, and it was showing 60psi (obviously quite high) which confused me based on the codes, but yea about 60psi consistently.

 

[TheSoggyDollar]

I just replaced all 4 fuel injectors. I wasn’t confident that it would resolve the issue, and it didn’t. Nevertheless, there’s one more thing that can be ruled out.

 

[G-492109]

I just replaced all 4 fuel injectors. I wasn’t confident that it would resolve the issue, and it didn’t. Nevertheless, there’s one more thing that can be ruled out.

Did you ever figure out what the problem was

 

[TheSoggyDollar]

I actually did as of about a week ago. It turned out that there was an issue with how the valve cover was bolted down... honestly, I had a mechanic take a look and what he diagnosed was pretty beyond my span of knowledge so I might butcher his explanation. What I gathered was that one of the bolts holding down the valve cover (near the high pressure fuel pump housing), was too long and interfering with the pump itself in some way.

 

[G-971710]

I actually did as of about a week ago. It turned out that there was an issue with how the valve cover was bolted down... honestly, I had a mechanic take a look and what he diagnosed was pretty beyond my span of knowledge so I might butcher his explanation. What I gathered was that one of the bolts holding down the valve cover (near the high pressure fuel pump housing), was too long and interfering with the pump itself in some way.

Thank you! I had the same problem

 

[retep]

Have the same problem, how do car now?