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I have codes P0171 and P0174. I have 160k miles on the
Hi. I have codes P0171 and P0174. I have 160k miles on the truck, 159k with the K&N CAI, and I cleaned the filter roughly 10k miles ago, without issue. I have replaced the MAF sensor and still get cod… read more
Daniel Chaidez
Daniel Chaidez
Technician
Diploma
1,986 satisfied customers
Have a 2015 Suburban aprox 105K miles that is repeatedly(for
Have a 2015 Suburban aprox 105K miles that is repeatedly(for last 10K mile intermittently) registering codes p0172 and p0175. Have cleaned MAF and replaced air filter. Have run fuel additives and 3-4 … read more
Richard Greer
Richard Greer
Online Automotive Repair Consultant
Vocational, Technical or Trade School
1,243 satisfied customers
I have 2015 gmc yukon with the 6.2 i have codes p0172 p0175
i have 2015 gmc yukon with the 6.2 i have codes p0172 p0175 p0446 p0449 i have replace evap vent soloniod there was fuel in the evap canister… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
19,904 satisfied customers
GMC 2014 Sierra I have code po171 and 174 fuel trims lean
GMC 2014 Sierra I have code po171 and 174 fuel trims lean bank 1 and 2 and when u stopped after my test drive po324 occurred knock sensor module performance. Any info would be helpful ...it's a 5.3 4x… read more
Ron
Ron
Automotive Tech
Vocational, Technical or Trade Scho
39,677 satisfied customers
2015 Yukon Denali CEL P0172 & P0175 Changed MAF sensor. At
2015 Yukon Denali CEL P0172 & P0175Changed MAF sensor.At idle Cold start LTFT are -5 After 15-20 minutes LTFT are -30 and STFT are -15. Running super rich. Sometimes so rich the car “diesels” (runs on… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
766 satisfied customers
GMC. I have a 2011 GMC Yukon LT with a 5.3 liter flex fuel.
I have a 2011 GMC Yukon LT with a 5.3 liter flex fuel. Was having trouble starting it when cold. My mechanic diagnosed it and it had 80 lbs of fuel pressure after shutting it off. He diagnosed the fuel pressure relief valve on the fuel pump as bad causing the fuel injectors to drip causing a flooding situation causing it not to start. He replaced the fuel pump with and AC delco unit from our local GM dealer. He is not sure this solved the problem. He states it still has 80 lbs of fuel pressure when shut off warm but states it goes to "normal" levels within a half an hour. He is letting me try it for a couple of weeks before paying him. Is this normal or is there something else wrong. It has started so far but I just got it back. … read more
Todd Audette
Todd Audette
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Vocational, Technical or Trade School
363 satisfied customers
I HAVE A 2003 GMS SIERRA ITHA P0300 CODE OF MISFIRWE. THEY
I HAVE A 2003 GMS SIERRA ITHA P0300 CODE OF MISFIRWE. THEY HAVE DONE MANY CHECKS AND STILL CAN'T FIND PROBLEM. THEY WERE INSTALLING NEW O2 SENORS AND THE UPDATING SEEMS TO HAVE FRIED MY ECM. COULD THE… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
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2004 GMC Sierra 1500 SLE with 5.3 liter (non-flex) has been
2004 GMC Sierra 1500 SLE with 5.3 liter (non-flex) has been giving a P0175 (rich bank 2) code. Previously had code for knock sensor as well and replaced them and harness, however still have bank 2 cod… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
766 satisfied customers
1998 GMC Sierra 1500 4x4 5.7L automatic. L0171 lean bank And
1998 GMC Sierra 1500 4x4 5.7L automatic. L0171 lean bank And L0174 lean bank codes as well as L0404 EGR Failure. No apparent vacuum leaks. Intake Manifold gasket replaced in the past. 160,000 miles of… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
19,904 satisfied customers
I have a 97 gmc jimmy I replaced the cat on and now I have a
Hi I have a 97 gmc jimmy I replaced the cat on and now I have a random misfire code. I have replaced the plugs, wires, cap, rotor, and air filter any ideas?… read more
Jerry
Jerry
Service consultant
Vocational, Technical or Trade Scho
13,108 satisfied customers
GMC Sierra: I have a 2002 GMC Sierra. It had a 4.3L V6 and
I have a 2002 GMC Sierra. It had a 4.3L V6 and I installed an 04 5.3 in it. I am currently having remarketablly... only 2 issues LOL. The first one is check engine code(s). I believe they are related … read more
Ron
Ron
Automotive Tech
Vocational, Technical or Trade Scho
39,677 satisfied customers
GMC Sierra 4X4: Ive got an 07 sierra 1500 5.3 with a trouble
I've got an 07 sierra 1500 5.3 with a trouble code c0561, when coasting the traction control light comes on and stabilitrac off shows up on the display. when this happens the transmission shifts hard … read more
Michael Moore
Michael Moore
Team leader, bumper to bumper tech.
Associate Degree
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GMC YUKON: I have a 99 GMC Yukon with a 5.7 vortec engine.
I have a 99 GMC Yukon with a 5.7 vortec engine. Put in New fuel pump (which required new wiring of female end from truck to pump) and a k&n air filter and know po175 code and check engine light comes … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Sierra Denali: Intermittant Low/Rough Idle - 2004 GMC Sierra
Intermittant Low/Rough Idle - 2004 GMC Sierra Denali w/Quadrasteer, 6.0L, 163k. Truck [seams to] run normal 99% of the time. On occasion/intermittant, at idle, engine idle speed drops from 6-700 to ab… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
24,545 satisfied customers
GMC Sierra 1500 Classic SLT: i installed a k&n cold air intake
i installed a k&n cold air intake on my 09 gmc 5.3 now i get codes saying i'm to lean. is there to fool the MAF sensor or is there another one i can install.… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Sierra 1500 Classic SLT: I have a 2005 gmc sierra and I
I have a 2005 gmc sierra and I cant control the temp on the drivers side. It constantly blows hot ass air while the passenger side is cold. This doesnt happen all the time but more than desired. Can t… read more
proautotech
proautotech
Shop Foreman
1,144 satisfied customers
GMC Jimmy 4x4 (Mid Size): I have a 1998 GMC Jimmy, 4.3Liter
I have a 1998 GMC Jimmy, 4.3Liter engine,.I am getting two codes, P0172 and P0175. I performed a leak down test and the fuel pressure holds at 60psi. The air filter is clean. I removed the plenum and … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,912 satisfied customers
GMC: 2006 1500 sierra throwing codes co245 and po172 and 175
2006 1500 sierra throwing codes co245 and po172 and 175 and fuel economy is terrible do i need to change the wheel speed sensor?… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
24,545 satisfied customers
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,912 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,589 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

766 satisfied customers

16 years of experience

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

248 satisfied customers

GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

Mike S.

Mike S.

ASE Certified Technician

241 satisfied customers

GMC N.A.I.S.E. Certified Auto-Mechanic

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