GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

My 02 heater and EVAP monitors will not run complete for…

My 02 heater and...

My 02 heater and EVAP monitors will not run complete for inspection would a air bag light on the dash stop this from completing?

Mechanic's Assistant: Have you noticed a rough idle? Has there been any leaking?

No leaks, idles great no check engine light

Mechanic's Assistant: What is the model of your '02 GM?

2005 GMC Yukon Denali, 6.0 engine

Mechanic's Assistant: Are you fixing your Yukon Denali yourself? What have you tried so far?

Yes doing myself, ghanged gas cap, changed the Purge valve solenoid vent, filled the fuel tank, followed the drive cycle a few times as close as I can

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

My air bag light is on because one of my impact sensors is bad.

Show More
Show Less
Ask Your Own GMC Question
Answered in 27 minutes by:
12/14/2017
Eric
Eric, Automotive Repair Shop Manager
Category: GMC
Satisfied Customers: 34,648
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified

HI,

Ok, are there any current or pending codes in the ECM?

Ask Your Own GMC Question
Customer reply replied 6 months ago
no codes at all

HI,

Ok, first, the airbag light does not prevent the monitors from setting to readiness.

I have found the most success doing the GM drive cycle with the vehicle on a lift. You can put it up on blocks or jackstands. This allows you to perform the drive cycle exactly as stated with no deviations. Just make sure it has 3/4 of a tank and sets for at least 8 hrs before doing the drive cycle

General Motors Driving Cycle

A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

If for any reason, you can't rate my answer OKAY, GOOD, or EXCELLENT/3 STARS OR HIGHER today. Please reply and let me know why, so I can help more/better. All follow up responses are FREE, after completing the required rating

Please remember to rate service using the separate rating page. Thank you

Ask Your Own GMC Question
Customer reply replied 6 months ago
This all started when I had a check engine light on for the evap system. I cleared the light and it did not return but I also deleted all the info in my computer so I changed the fuel cap, the Purge valve solenoid vent, filled the fuel tank. I have run the drivers cycle a few times but always on the road. I need these to completely run so I can get my vehicle inspected, my inspection ran out Dec 1st.. I will try this drive cycle on jack stands and will let you know how it turn's out . Hopefully this works I will let you know as soon as possible. Thank you.

HI,

Sounds good and I am here every day

Eric
Eric, Automotive Repair Shop Manager
Category: GMC
Satisfied Customers: 34,648
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified
Eric and 87 other GMC Specialists are ready to help you
Ask your own question now
AMEDEE
AMEDEE, AUTOMOTIVE TECHNICIAN
Category: GMC
Satisfied Customers: 9,105
Verified
Phone call session started
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a gmc mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Eric Your Own Question
Eric
Eric
Eric, Automotive Repair Shop Manager
Category: GMC
Satisfied Customers: 34,648
34,648 Satisfied Customers
Experience: 20+ yrs. experience as repair shop manager and technician.

Eric is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,796 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,588 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

626 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

279 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

270 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

228 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

< Previous | Next >

Related GMC Questions
Ac driver side heat on the passenger. No leaks coolant fine
ac driver side heat on the passenger JA: Have you checked the coolant level? Has there been any leaking from the hoses? Customer: no leaks coolant fine new switch installed JA: What is the model/year … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
I have a 92 sierra replaced alternator and battery it sat
i have a 92 sierra replaced alternator and battery it sat for a couple days dead battery..i took battery back charged it say thing happen … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,332 satisfied customers
Service trailer brakes and abs light on, replaced trailer
Service trailer brakes and abs light on , replaced trailer brake mod under the bed of my 2007 gmc 2500 duramax . Still say service trailer brakes. Checked fuses they are good . Replaced both front hud… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,796 satisfied customers
Brake lights come on when parked killing the battery. I
Brake lights come on when parked killing the battery. I changed the switch above the brake pedal but it still is happening. You think it is the ignition switch? … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
It says stabletrack system off service brake system it's a
It says stabletrack system off service brake system it's a 2009 GMC Acadia … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Replaced starter, battery, alternate still won't start. New
Replaced starter, battery, alternate still won't start. … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
1,245 satisfied customers
I just changed my coolant thermostat and the sensor in a
I just changed my coolant thermostat and the sensor in a 2006 gmc canyon and replaced the coolant I lost. Now the temperature reads hot and I get a dash warning ac of engine hot. But the air coming ou… read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
09acadia brakelightandstabilirac. 09acadia brake and
09acadia brakelightandstabilirac JA: What is the model/year of your GMC? Customer: 09acadia brake and stabilitrack lighton // JA: Have you checked the brake fluid? How's the level and when was it last… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
DIC stopped working. 2004 yukon. Diconnect battery and
I have located bot fuse panels but only one had a DIC… read more
JFN1
JFN1
ASE Certified Technician
Vocational, Technical or Trade Scho
270 satisfied customers
Every light on the dash is on and won't turn off. Brake
every light on the dash is on and won't turn off. Brake Booster, Battery, Check Trans, Trans oil temp.. … read more
JFN1
JFN1
ASE Certified Technician
Vocational, Technical or Trade Scho
270 satisfied customers
Often stalls when braking. No the check engine light is not
No the check engine light is not on. Truck stalls when braking but starts right back up. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Battery will not charge. new battery and new alternator. The
battery will not charge. new battery and new alternator … read more
Cesar Jimenez
Cesar Jimenez
Owner/CEO
Vocational, Technical or Trade School
171 satisfied customers
I have a brand new battery in but my battery level sits at
I have a brand new battery in but my battery level sits at about 11 on the cluster and won't turn on, if I boost it the truck starts and runs normal but if I turn the truck off the truck immediately w… read more
Mechanic01
Mechanic01
2,813 satisfied customers
My e-brake light won't turn of and I believe the e-brake
My e-brake light won't turn of and I believe the e-brake won't release. The ABS light won't go off either. This just started yesterday.… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
362 satisfied customers
New battery drains overnight. No but the battery is new. The
No but the battery is new. The same thing happened before the battery was replaced. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Coolant leaking around right bank second from front
Coolant leaking around right bank second from front injector, we pulled the injector and we see coolant at the bottom of the hole, please advise? … read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
Idle engine. 285000 VVM envoy 2003 XL. Also battery not
This just happened todayhvnt had a chance to do anything as yet… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
626 satisfied customers
Battery saver light came on. Battery test with the engine
Battery saver light came on. Battery test with the engine off at 12.7 VDC, With the engine running at an idle 15.7 VDC. Trying to locate the issue … read more
Mechanic01
Mechanic01
2,813 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x