GMC

GMC troubleshooting questions? Ask a mechanic for answers

Ask an Expert,
Get an Answer ASAP!

Truck: 1997 GMC k1500 Z71. Do not think there is any other…

Customer Question
Truck: 1997...

Truck: 1997 GMC k1500 Z71

Mechanic's Assistant: What is the model of your '97 GMC?

Do not think there is any other model name. Just GMC K1500 Z71. Problem: 4wd has not worked since started. Just did diagnostics check by grounding pin 13 on data link connector. Result: Blinged once, they stayed off. This says that there are not recorded DTC errors.

Mechanic's Assistant: Have you checked the battery, particularly the terminal connections? Are they corroded?

Wiring and connector cleaning. Disconnect battery. Disconnected connectors and wires to front differential 4wd actuator and actuator sensor. Cleaned all connections with electronics cleaning spray. Tested wires and harness....all good connection.

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

Yes, doing diagnostics myself. Replaced front differential 4wd actuator. Cleaned all electronics and connections. Almost new battery, 12.7 vdc idle With all front differential wired disconnected, did pin 13 diagnostic code reading again: Result: DTC error code #1. This is correct. I disconnected power to before disconnecting connectors. Did ignition on/0ff 6 times to clear DTC code #1. Read DTC codes again....Good. Lights flash once then off. No error codes...and all wires for front differential are not connected!!!

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

Previous owner had told me he had replaced ECM in truck. Wondering is he could have installed a 2wd ECM

Submitted: 7 months ago.Category: GMC
Show More
Show Less
Ask Your Own GMC Question
Answered in 4 minutes by:
12/6/2017
GMC Mechanic: Gary, ASE Certified Technician replied 7 months ago
Gary
Gary, ASE Certified Technician
Category: GMC
Satisfied Customers: 18,021
Experience: GCM master tech over 25 years
Verified

Welcome! My name is ***** ***** I will do my best to assist you with this problem.Ask me about added features such as phone contact anytime if you wish !

Ask Your Own GMC Question
GMC Mechanic: Gary, ASE Certified Technician replied 7 months ago

floor shifter or electronic transfercase ?

is the front actuator an aluminum colored or big black plastic one ?

Ask Your Own GMC Question
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 Gm Tech (Cam) Your Own Question
Gm Tech (Cam)
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1,813
1,813 Satisfied Customers
Experience: GM Grand Master Technician 2007. 14 year experience.

Gm Tech (Cam) 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

1,813 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

18,021 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
My GMC acadia has a strange problem, the engine starts fine
Hi, my GMC acadia has a strange problem , the engine starts fine but after a few minutes the engine just dies. Also sometimes while I am driving at 2000 2500 rpm the engine just stalls . it seems like… read more
Nate
Nate
Automotive Technician
Automotive Trade School Degree
319 satisfied customers
Have a 1991 gmc k1500 getting code 22 and 43. replaced
have a 1991 gmc k1500 getting code 22 and 43. replaced throttle position sensor electronic spark control and knock sensor. … read more
Ricardo Hohl
Ricardo Hohl
Auto Motive Instructor
Automotive tech
4,320 satisfied customers
I have 2009 GMC Yukon denali with 6.2L, with air bag service
HI, i have 2009 GMC Yukon denali with 6.2L, with air bag service light on, scanned with codes B0081 and B0084. how do i diagnose these codes?… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,450 satisfied customers
I just converted my 06 gmc hd 2500 to 4wd and I'm not using
I just converted my 06 gmc hd 2500 to 4wd and I'm not using the factory transfer case and electronics and wanted to figure out how to get the actuator to work … read more
Gary
Gary
ASE Certified Technician
18,021 satisfied customers
My gMc top kick c4500 front drive shaft locks in during
My gMc top kick c4500 front drive shaft locks in during 4wheel drive but the front tires womt engage n turn… read more
Peter Zavarelli
Peter Zavarelli
Automotive Diagnostic Specialist
General auto certifications
415 satisfied customers
2005 GMC Topkick duramax LLY allison I have engine codes
2005 GMC Topkick duramax LLY allison I have engine codes p0340 and p0341. I also have tranny code p0708… read more
sprinkles08
sprinkles08
Technician
High School or GED
17,759 satisfied customers
I have a gmc acadia SLT 2, 2009 and got stuck in a very
Hi, I have a gmc acadia SLT 2, 2009 and got stuck in a very difficult situation. After engine warms up to its optimum temperature, car would jerk and door gets locked unlocked followed by engine shut … read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,813 satisfied customers
I have a 2004 GMC Sierra 2500 4WD, when I push the 4WD
I have a 2004 GMC Sierra 2500 4WD, when I push the 4WD button the light just flashes and doesn't do anything. I have a message on the instrument panel that says SERVICE 4WD SYSTEM, I've checked all th… read more
Gary
Gary
ASE Certified Technician
18,021 satisfied customers
2006 gmc 4x4 duramax. When i push the 4wd lo or button
2006 gmc 4x4 duramax. When i push the 4wd lo or hi button it blinks and does not engage front diff. Does engage transfer case and rear diff The service 4wd message is also present. I tthink it's the a… read more
Peter Zavarelli
Peter Zavarelli
Automotive Diagnostic Specialist
General auto certifications
415 satisfied customers
Hal; Here's the info:2007 Yukon XL Denali159,000 milesProblem
Hi Hal; Here's the info: 2007 Yukon XL Denali 159,000 miles Problem: "Service Stabilitrack", "Service Traction Control", Engine light, "Service Tire Inflation System", "Park Assist ON/Off" - These lig… read more
Hal
Hal
owner/service tech
Vocational, Technical or Trade Scho
924 satisfied customers
GMC jimmy: Have 2000 GMC jimmy I have replaced actuator, small
Have 2000 GMC jimmy I have replaced actuator, small sending unit on the transfer case and now the dash control switch it is still nutty what gives?… read more
Jerry
Jerry
Service consultant
Vocational, Technical or Trade Scho
13,107 satisfied customers
GMC K3500 Sierra 4x4: I have a 97 GMC K3500 with a 454. The
I have a 97 GMC K3500 with a 454. The 4WD is intermittent. I replaced the front actuator and the problem persists. I cannot find a condition that exists that would cause the 4WD to be intermittent. Wh… read more
Gary
Gary
ASE Certified Technician
18,021 satisfied customers
GMC Envoy: I have a 2002 Envoy XL SLT with 244,000 on it.
I have a 2002 Envoy XL SLT with 244,000 on it. When I put the truck into AWD, 4H or 4L the selector seems to work fine and I get no warning or CEL. The 4wd works at idle or very slight gas (1 to 3 mph… read more
Peter Zavarelli
Peter Zavarelli
Automotive Diagnostic Specialist
General auto certifications
415 satisfied customers
GMC K1500 Sierra 4x4: i have a 1998 GMC Sierra Pick up, the
i have a 1998 GMC Sierra Pick up, the 4wd will not engage, the 4 hi lite blinks a few times then goes back to 2hi. I have power going to the actuator on front axle, power going to i believe the encode… read more
shawnrbaldwin
shawnrbaldwin
Owner/mechanic
5 satisfied customers
gmc sierra 2500: Hello, I have a 2002 GMC Sierra 2500 4WD
Hello, I have a 2002 GMC Sierra 2500 4WD in the shop today. The four wheel drive isn't operating. It is not push button, is has the shifter in the floor. All fuses in the truck are good I payed specia… read more
Gary
Gary
ASE Certified Technician
18,021 satisfied customers
GMC Tahoe: I have GMC Tahoe 2007 with 5.3 v8 , had DTC P0121
I have GMC Tahoe 2007 with 5.3 v8 , had DTC P0121 for TPS performance , I made clean out of throttle body and made resetting idle by tech2 after that finish this problem and appear new problem that is… read more
Dan
Dan
High School or GED
2,257 satisfied customers
GMC Suburban K1500 4x4: 1996 GMC K1500 Suburban, 5.7L (216000
1996 GMC K1500 Suburban, 5.7L (216000 mi): This vehicle has electronic 4wd. I noticed the light on the 2wd switch (normally on) was not on. Pushed 2wd button, no response. Pushed 4wd hi button, no res… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,813 satisfied customers
GM gmc sierra 1500: i have a 2000 gmc sierra z71 the 4x4 is
i have a 2000 gmc sierra z71 the 4x4 is not engauging the transfer case is engauging the 4x4 actuater is new and all the fuses are good what can it be?… read more
Peter Zavarelli
Peter Zavarelli
Automotive Diagnostic Specialist
General auto certifications
415 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