Question about 2004 GMC Yukon

2 Answers

2004 denali check engine light stays on

2004 yukon denali check engine light stays on, my mech told me a few codes were reset by dealer, so they could sell it. I got 4 codes p01001b, p0171b, p0174b and u1301. Just bought this lastweek drove it 3 times

Posted by on

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • GMC Master
  • 3,854 Answers

A code P0100 may mean that one or more of the following has happened:
The MAF may be disconnected, or a wiring connection may be bad, or the MAF may be faulty

Then start with the cheapest, easiest repair procedures:
Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
Unplug and reconnect the MAF wire harness
Check the voltage of the MAF sensor
Clean the MAF with MAF cleaner
Replace the MAF sensor if cleaning does not help.

Your car has either a P0171, P0174 lean fault code or both stored in the computer, these codes are based on Oxygen Sensor (O-2) readings. A lean code or codes indicate that there's too much oxygen in the exhaust. Remember parts stores have employees that have good intentions but they may not have the experience necessary to interpret what the trouble codes really mean. These codes are based on oxygen measurements in the exhaust. A common mistake with lean codes is to replace the oxygen sensors. This could be a very expensive mistake that will not fix the problem. Especially if both codes are present, because the chance of both O-2 sensors failing at the same time is very unlikely.

Most likely the cause is a vacuum leak. A vacuum leak can be caused from a vacuum hose, intake gasket or maybe even a leak in the air intake hose from the MAF (Mass Air Flow Sensor). Listen for a hissing sound that may lead you to the source of the problem.

Aftermarket air filters that use oil on the element can sometimes damage the MAF. Over oiling the air filter may allow some excess to get on the MAF sensor wire or element. This can alter the reading, fooling the ECU into seeing more or less air flow therefore changing the air/fuel mixture incorrectly. I once worked on a car that would not start that had a problem with a MAF. When looking at the wire in the MAF, there was a burned piece of trash that made it's way past the air filter. After cleaning the sensor the car ran perfectly. The ash that was on the MAF sensor wire was altering the reading by enriching the mixture so much that the car could not run. After talking with the customer, he said the air filter was just changed. This was obviously when some trash got into the air intake hose that settled on the hot wire of the MAF.

According to my code scanner book, P1300 is GM-specific for "Ignition Coil #1 Primary Feedback Circuit".
So I'm guessing that the P1301 is also related to coil/misfire issues and replace that coil and see if it helps.

Before you get started with all the problems, they are all related with the MAF sensor, Clean the MAF first and check the wire harness and all the fuse. There is a fuse for the O2 and MAF sensor, so check that. Good luck and keep me posted.

Posted on Nov 17, 2009

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,201 Answers

There is no p01001, it's either p0100, or p0101.
Anyway, it's the mass air flow sensor that's bad. The p0171 and p0174 is a lean condition on bank 1 and bank 2, which are the oxygen sensors. Change the mass air flow sensor and that should take care of the p0171 and 74 codes.
The mass air flow sensor can cause the 02 sensors to read lean.
The u1301, is a class 2 circuit short to battery. That, you have to test wires to find with a voltmeter/continuity tester.
I would try and find that short before changing the flow sensor, you don't need the new one shorting out, they are not that cheap.

Posted on Nov 17, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

REDUCED ENGINE POWER ON 2004 YUKON DENALI


throttle position sensor is prob. bad. unfortunately this mean replacing the throttle body

Dec 14, 2013 | 2006 GMC Yukon Xl Denali

1 Answer

Stability system disabled light on no power


The stability system is software programmed into the ABS - antilock brake control module also the PCM - engine computer . service engine light DTC'S - diagnostic trouble codes stored . Your best bet , take it to a qualified repair shop or the dealer . You don't have the diagnostic equipment or knowledge to tackle this type of problem .

Jul 24, 2017 | 2003 GMC Yukon Denali

2 Answers

We have a 2003 yukon denali xl. we have a signal saying battery not charging. we replaced battery and alternator. still won't charge. truck goes completely dead. no lights, radio anything. what el


I'll try to help, everytime something gets replaced on these yukons, that circuit needs to be RESET ! Is there a reset button, on your steering wheel, to reset a variety of functions ? , check owners manual, or call your dealer for better advise

Feb 15, 2013 | 2007 GMC Yukon XL Denali

1 Answer

I have a 2004 Yukon denali and while driving, I got check gas cap alarm. 2 miles later check engine light is on. Checked gas cap, cleaned gasket and tightened. Drove for 2 days. Reset fault and drove 160...


Hello, have you tried to unhook the negative side of the battery for about 10 minutes and then go from there . It should reset the computer completely .

Sep 14, 2011 | 2003 GMC Yukon Denali

2 Answers

I have 2004 Yukon and have a strong gas smell but no apparent leaks. No check engine lights are on and no codes when tested. Been told it may be EVAP filte...engine comparment was recently...


I just had my fuel sending unit replaced for this same reason. The top of the unit where the lines connect rust and begins to loose gas preasure. However the gas pump and sending unit cannot be purchased seperatly it will run you about $300.00
My problem persisted long enough for the Check Engine Light to come on though Now i have to learn how to reset it..

Jul 28, 2011 | 2004 GMC Yukon

1 Answer

How to reset the engine light on a 2007 yukon denali gmc


The check engine light is reset with the scanner. You can also try disconnecting the battery for about 1/2 hour and then connecting it again. If there is a fault code the light will come on again.

Jan 14, 2011 | 2007 GMC Yukon Denali

1 Answer

HOW DO I RESET THE CHANGE OIL LIGHT ONCE THE OIL


look in the manual......turn the ignition to the on position not starting it of course and then pump the gas petal 5 times then the light will blink a few times turn off then back on...problem solved

Jan 30, 2010 | 2002 GMC Yukon Denali

1 Answer

2004 YUKON XL DENALI, new throttle messed up delayed shift points


I recently had a low engine power on my 2003 Denali. The check engine light came on and I couldn't go above 40 mph. I took it in the next morning but by this time the check engine light had gone off. The mechanic had just recently seen the same problem in another Denali in which they changed the battery and had no problems since. I also decided to have them change out my battery and I have not had the problem since either. I would stay away from the dealership if I were you, and always get a second opinion. Most smaller shops wont charge for a diagnostic where the dealership will charge at least 80 just to tell you what might be wrong and that will only work if you have a warning light on at the time.

Jan 22, 2010 | GMC Yukon Denali Cars & Trucks

2 Answers

04' GMC YUKON DENALI CHECK ENGINE LIGHT ON & RUNS FINE????


Go to an Advance or Auto Zone and ask them to read your fault codes. This is a service they will do for free in hopes of selling you a replacement part. You likely have a faulty sensor that is causing the light to come on. Good Luck! I hope this is very helpful!

Nov 20, 2009 | 2001 GMC Yukon Denali

2 Answers

2004 Yukon Denali XL Radio Unlock Code


Dealer can give you the code,call them with your vin number.

Nov 13, 2009 | 2004 GMC Yukon

Not finding what you are looking for?
2004 GMC Yukon Logo

1,824 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...