2012 SLT - High Pressure Fuel Pump? - GMC Acadia Forum: AcadiaForum.net
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post #1 of 12 (permalink) Old 03-01-2019, 03:26 PM Thread Starter
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2012 SLT - High Pressure Fuel Pump?

For the last 18-months, the engine will shudder when going up a slight incline or under light load. Push on the gas, I have tons of power. Gear changes are always smooth. It's when I'm on cruise control or holding the engine steady between about 1400 and 1800 RPMs. The rpms also tend to surge a bit up and down about 50-100 rpms in a regluar frequency when under this condition. Every couple months when this happens, I'll get a P030X random misfire code and the car goes into limp mode. There is usually a fuel odor and even some light smoke from under the hood. The code has been thrown for three of the six cylinders and seems to be random as to which one (1, 2, 4). After sitting for five minutes, the car runs fine. I've replaced the coils twice, the crankshaft and camshaft sensors, and all the plugs. I even sent it to the dealer a couple months ago for a week and they couldn't reproduce the problem and all their diagnostics came back OK. Did the same thing with the same results at a Firestone repair shop a couple months prior to that.

Last night, it happened again. This time, it had two new codes. I pulled the codes, cleared them, and the car's back to normal (normal being the slight shudder and surge explained above):
  • P00C6: Fuel Rail Pressure Too Low - Engine Cranking (Intermittent)
  • P228C: Fuel Pressure Regulator 1 Exceeded Control Limits - Pressure Too Low (Confirmed)
The parts store and I went through the diagnostics on those errors and determined next step should be to replace the high pressure fuel pump. It shows up in a couple days. Should I also try replacing the fuel pressure sensor while I'm at it? Any other suggestions? There doesn't seem to be a lot of info on doing this repair on these specific vehicles. Do I need to bleed the fuel system post repair or anything? If this doesn't solve this problem, do you have any suggestions on what to try next?

Pump arrives in a couple days and I'll post back whether it fixed the problem or not. Thanks.


Vehicle: 2012 Acadia SLT w/ 85,000 miles. All regular maintenance done consistently. I run a bottle of the techron stuff through once a month. Full synthetic oil changes.

Last edited by bennifer; 03-01-2019 at 03:33 PM. Reason: Grammar. Added bit about dealer and shop diagnostics.
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post #2 of 12 (permalink) Old 03-01-2019, 04:07 PM Thread Starter
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I found this gem of an article and I'm feeling good about this as a fix: (www).techshopmag.com/pulling-codes-p00c6-direct-and-to-the-point/ (Still a newbie so no links for me)

Any recommendations when doing this repair?
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post #3 of 12 (permalink) Old 03-01-2019, 04:53 PM
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Interesting article. Seems you're on the right track. Haven't heard of the need to bleed any gas fuel system when a fuel pump is replaced - diesel, yes ... gas, no. (sorry for the bad "poetry" ) Will be looking forward to reading the results.

2007 Acadia SLT-2, 'HiYo' Silver outside, Ebony/Titanium inside, no NAV, no HUD, no errors
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post #4 of 12 (permalink) Old 03-02-2019, 11:56 AM Thread Starter
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Anybody know how to release the fuel pressure before I start disconnecting things? I read somewhere that's something I should do. I haven't been able to source a local copy of a Chilton or Haynes manual and Amazon can't get one here until mid-week.

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post #5 of 12 (permalink) Old 03-02-2019, 12:20 PM
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Originally Posted by bennifer View Post
Anybody know how to release the fuel pressure before I start disconnecting things? I read somewhere that's something I should do. I haven't been able to source a local copy of a Chilton or Haynes manual and Amazon can't get one here until mid-week.
You'll find a service manual download link in this thread: https://www.acadiaforum.net/8-gmc-ac...rs-manual.html Won't be the same year or model, but info should be similar.

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Last edited by speleos; 03-02-2019 at 12:22 PM.
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post #6 of 12 (permalink) Old 03-02-2019, 05:17 PM
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Quote:
Originally Posted by bennifer View Post
Anybody know how to release the fuel pressure before I start disconnecting things? I read somewhere that's something I should do. I haven't been able to source a local copy of a Chilton or Haynes manual and Amazon can't get one here until mid-week.
On other vehicles I just pulled the fuel pump fuse and started the vehicle. Eventually the pressure drops to the point where the engine dies.

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post #7 of 12 (permalink) Old 03-04-2019, 01:21 PM Thread Starter
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Solved

That was an easy fix and it drives like new. The difference is surprising. There were certainly other subtle symptoms I had become used to and had accepted as normal over the past 18-24 months. Now that they're gone, it's obvious.

Repair: Once I pulled the fuse and ran the car until it died (thanks @cfm56doc), it took about an hour to finish the job due to the bottom bolt being highly inaccessible. The manual I was using went through pulling the intake manifold but none of that was necessary on this vehicle. Only challenge was bottoming out the roller lifter so I could install the new pump. Couldn't figure out how to hand crank the engine so I just quickly turned the key on and off until I had clearance to install the pump.

* $450: Spectra Premium FI1507 Direct Injection High Pressure Fuel Pump
* $55: ACDelco 12591197 GM Original Equipment High Pressure Intermediate Fuel Feed Pipe
* $10: Sta-Lube 3331 X-TREME Pressure Engine Assembly LUBE-10 OZ. Tube, 10. Fluid_Ounces

I hope this helps somebody.
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post #8 of 12 (permalink) Old 03-04-2019, 03:10 PM
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Thanks for the update, @bennifer. I'm sure this will be helpful to others who are experiencing similar problems with the 3.6L GDI engine in their car.

2007 Acadia SLT-2, 'HiYo' Silver outside, Ebony/Titanium inside, no NAV, no HUD, no errors
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post #9 of 12 (permalink) Old 03-07-2019, 06:42 PM
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Thanks for the write up

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post #10 of 12 (permalink) Old 03-08-2019, 08:03 AM
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Thanks. It is truly helpful. I just wonder what has caused these parts failed so fast. These parts should be last over 10 years.
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