Last post on Dec 10, 2013 at 1:28 PM
You are in the Chevrolet Suburban & Tahoe
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Chevrolet Tahoe, Electrical, SUV
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#281 of 459 Re: 2008 Chevy Tahoe Electrical Problems [ck2012]
Apr 16, 2012 (10:15 am)
If you haven't already, please send an email to socialmediagm.com (include your name/Edmunds username, phone and address, the last 8 of your VIN and current mileage, and the name of your involved dealership, as well as a description of the issue and any visits you have made to the dealer for it) and we will explore any options that may be available; however, I cannot guarantee any results up front.
All the best,
GM Customer Service
#282 of 459 2008 Chevrolet Silverado Electrical problems
Apr 20, 2012 (1:40 pm)
I'm active duty Navy and just purchased a 2008 silverado ltz(last nine of VIN: 481124518) . It currently has 71000 miles on it. I was driving down the interstate when the interior gauges, radio, door locks and temperature indicator all flashed off and cut right back on. Anytime I would use the turn signal the radio would cut off and the 'Park Assist Off' would flash on. It continued to do this the whole way home (approximately 30 minutes). I parked the truck and shut it off. Let it sit for about 30 minutes and then went to crank it up. Initially it acted like the battery was dead. I tried a second time and the truck cranked right up. I haven't taken it to a mechanic yet. Help please???!!!!
#283 of 459 Re: 2008 Chevrolet Silverado Electrical problems [bran164]
Apr 21, 2012 (9:38 pm)
Bran164 – Sorry to hear of your car’s electrical problem. But even more sorry is the extremely long line of GM car/truck electrical issues (from just this forum alone) that remain unsolved and correspondingly the enormous amount of consumer time and money wasted at the GM related dealerships and other repair facilities in pursuit of fixing these problems. Your vehicle, unfortunately, is most likely experiencing a failure of the GMLAN system. While the problem is not unfixable, GMLAN is very complex and so inadequately supported by GM that probably 95% the dealerships’ service departments have neither the expertise nor capacity to diagnose and properly fix these problems, in my opinion. You only need to read a number of the posts in this forum and you will begin to understand the frustration of consumers who have spent thousands of dollars as well as weeks and even months with their GM vehicles out of commission, all because dealer service departments have misdiagnosed the electrical problems and as a result, incorrectly replaced expensive electrical components that didn’t need to be replaced and ultimately didn’t fix the problem. I hope your vehicle’s electrical problem gets fixed soon and if it is please let the rest of us know what the problem was and how it was fixed. Click on the link to get a glimpse of just some of what can be causing your vehicle’s problem.
http://www.autoserviceprofessional.com/article/92084/finding-gmlan-wiring-proble- ms (cut and paste into your browser if the link doesn't work)
#285 of 459 Return message to t Tex
Apr 22, 2012 (5:19 am)
Thank you for your response. Have you had a similar problem with your Chevrolet? With your recommendations for possible remedies, am I able take those to a dealer or mechanic and ask them to trace those?
#286 of 459 Re: Return message to t Tex [bran164]
Apr 22, 2012 (10:56 am)
Have an '09 Tahoe with same problems except no starting issues - door locks cycling, ipc malfunctions, chimes going off, park assist messages, limp mode, ac/climate control malfunction. Chevy dealer was useless. Took it to specialty auto electric shop they had it for 2 months and fixed. It ran fine for 6000 miles now its doing the same thing. If you can get a dealer to take the time to check those things listed on that link you would be lucky. You need to find a tech who will systematically go thru each component in the gmlan system to check for problems. That's the problem - no easy way to pinpoint the problem like with an engine or emissions control issue that will show up on as a diagnostic trouble code with a simple scan at the dealer or repair shop. It's going to take a class action lawsuit to get GM to own up to these problems and create a diagnostic protocol that can pinpoint these problems.
#287 of 459 Re: 2008 Chevy Tahoe Electrical Problems [ck2012]
Apr 23, 2012 (8:55 am)
I was wondering if you ever got a resolution to your electrical problem on the suburban? Sounds like you and I have the exact same situation. Any help would be greatly appreciated.
#288 of 459 Re: 2009 Electrical Problems [t_tex]
Apr 23, 2012 (9:31 am)
Thanks Tex! Much appreciated. My Tahoe was at the shop for just over 2 weeks in total. Guess I mentioned this in previous post but will post my "start to finish" in case it helps anyone.
After my vehicle started going haywire with the locks popping up and down, dashboard going dark and lighting back up etc while driving, key fob not locking/unlocking and random instances of not starting I took my car to a GM dealership to be looked at.
1)They first replaced the negative battery wire/terminal and called to say it was fixed
--I drove over and picked up my car but before even getting on the highway the computer and guages started going crazy again. So I had to turn it back in for more analysis
2)A week later I went by to speak with the service tech and go over what they were doing.
--he said that although they had replaced the negative battery terminal and wiring they hadn't reset the computer in my vehicle.(before they had only cleared the error codes but hadn't done a reset after battery wire replacement) They claimed that is the only other thing they did to fix my problem. Not a very comforting explanation but so far so good.
I have had my Tahoe back since 3/20/12 and have not had any of these issues come back up (crossing fingers)...
I do still have my 'Park Assist Off' message display about 50% of the time but I will take that any day over all the headache of the guages/computer problems that I was having.
Hoping this info might be helpful to one of you.
#289 of 459 Re: 2008 Chevy Tahoe Electrical Problems [bran164]
Apr 23, 2012 (9:56 am)
Yes, I finally fixed the electrical problems in my 2008 Chev Tahoe. 94,000 miles
A bit of background on the matter. This electrical problem had been going on for over a month now. I'm unemployed so I wasn't about to take the car to the dealer and get raped with a giant repair bill.
Here's was my summary of repairs and eventual sollution to the main problem.
A. 3 brand new batteries over a month period,
B. One new alternator
C. One Loose starter cable
D. Loose battery ground cable wire in pre-clamped factory cable.
E. Small battery posts - sollution: Sanded/grinded clamps to allow for better grip on battery.
I drove out of town. Six hours into the trip, the electrial problem began (at freeway speeds 65-70 MPH), power door locks kept going up and down, dash gauges flickering and reseting, radio in and out. Basically - complete electrical failure during freeway driving.
We (family) safely pulled off the freeway into a Shell station which had a repair shop. The mechanic convinced me that it was the alternator. His meter was showing a reading of 1200 and it should have been showing a reading above 1400... blah, blah... lies, lies, lies...and yes- I bought a brand new alternator: $287.00 delivered to the shop and $45 to install it. My daugther paid for it with her college money. The mechanic did show me how the bearings on the pully of the old alternator Tahoe were also going out. Whatever!!! One day later, I'm still out of town- far from home....same electrical problem on the Tahoe. I noticed that the battery charge gauge on my dash would begin at 14 volts in early drive, then drop down to 9 to 12 volts over 30 minutes of driving. I took the Tahoe back to the same repair shop by the Shell station.
I had read some of the previous comments in other online posts...and asked the mechanic to raise the car and check the starter for a possible loose cable connection. Sure enough: He found that the starter cable wire was loose. After tightening the cable, we went to reconnect battery and the starter would not shut off. Hmmm....scammer mechanic tried to sell me a starter? Nope... .turns out that there is a specially-made metal washer on the connector to the starter with a little metal piece that needs to sit or fit in a groove on the actual starter. We took starter out, readjusted the metal pin, put starter back and took car for a test drive on the freeway.
I told the mechanic that I wanted to go on the test drive and did so. Guess what? Same electrical problem again. The Tahoe eventually died once we stopped at the back of the Shell station. The mechanic turned the car off and when he went to turn the car back on... Nothing! No electrical current. Then, we open the hood, Voyla!!- we jiggled the ground battery cable and all of the electrical juice comes back on. Mechanic figures that the problem is my battery posts (too small) and ground battery cable is a bit loose.
Then, the mechanic tries to measure the posts on new Interstate batteries that he is selling at his shop and suggests that I should buy a new battery. His new battery's posts are obviously thicker...blah, blah.... Aaaahh....NO! I'm not buying a fourth battery... Sooo....
Yep! You guessed it, the battery terminals on my (Third) and new Auto Zone battery were in fact too small in diameter. We took the Tahoe's black ground battery cable apart, un-screwing the tightening bolts and removed them. The mechanic sanded down the clamp's edges with a small electrical grinder so that it would close and grab the smaller battery posts with lots more strength and it fixed the entire problem! Before re-applying the black cable back on the battery, at my request, the mechanic smashed/hammered the metal factory pre-clamp area around the actual cable for a better connection. We found that even though the cable came pre-clamped from the factory, it was a bit loose and corrosion could possibly be preventing a stable electrical connection.
Three hours of labor and I made mechanic feel pretty bad for mis-diagnosing first problem with a new alternator that we probably didn't need. I asked him how much I owed him and he said $40.00 should do it. WOW! I felt like I won the lottery! The local chevy dealership wanted to charge me $120.00 per hour and that it would take at least two hours to diagnose the problem. Plus, a new black ground cable for my Tahoe was $96.00 plus tax at the Chevy Dealer. I priced a similar cable at auto zone and they wanted $15.00.
So far, driving the Tahoe for one week and a half without any electrical issues.
It's amazing how such a simple problem caused so many electrical problems. My wife thinks I got screwed on the alternator, but hey - the Tahoe was built in 2007, sold in 2008 and so, the old alternator lasted five good years. The new one I installed is original GM parts so hopefully I'll be okay for another five more years.
If your 2008 Tahoe is having similar electrical problems, it would behoove you to read my success story and do your best to avoid letting the mechanic take the car out for a drive by himself or herself. In these tough economic times, you should not trust anyone to drive your car by themselves! Don't lose signt of the mechanic near your car either. Although there are lots of honest mechanics, the few that aren't honest will drain your pocket books in the blink of an eye.
#290 of 459 Re: 2009 Electrical Problems [laytonico]
Apr 23, 2012 (2:58 pm)
Congrats laytonico - thanks for sharing your experience. Everybody benefits when posters relate their vehicle problem/repair experience - especially the solution. Hopefully, your vehicle's fix will be lasting. As I related in my post, 6000 miles and 3months after my 09 Tahoe appeared to be fixed, it's acting up again. I'll definitely look into the battery connections issues. Thanks. Also, thanks to traveler2012 for his post and the thorough description on problem through the fix.