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Chevrolet Tahoe Electrical Problems



  • t_text_tex Posts: 25
    Yes, I will definitely post the results the 2009 Tahoe ongoing saga. Just to be fair to GM, I have to say that I also have a 2007 Tahoe with 73,000 miles and never had an instance of a problem - its been one of my all-time favorite vehicles. Cars are machines and machines break, I understand and accept that. The problem I have with GM is that when we pay the kind of money that these vehicles cost, we have a right to expect that GM will provide service facilities that can fix problems in a reasonable amount of time at a reasonable cost. If they are going to equip vehicles with highly complex and intelligent electrical systems then they need to be prepared to stand behind their product with trained techs who can fix problems without taking your car for weeks on end with no real solution. I would hate to see people get into accidents, take off of an inordinate amount of work or even lose their jobs, or just have to deal with the ongoing stress of being worried about whether your car will work right today or will it leave you stranded tomorrow because of lack of trained techs in shops that are just not committed to getting it right. I don't think any of us are asking to get something for nothing - just straightforward competent service in a reasonable amount of time so we can all drive safely alway from the dealer happy.
  • notsohappy5notsohappy5 Posts: 1
    edited December 2011
    We have a 2007 Tahoe, didn't have any electrical problems until we brought it in for a oil change at a shop on a road trip before returning home. They said there was a update on the computer so that was done. Worst thing we did. Ever since the air bag light comes on, now my engine light comes on, anti skid light. What is next? The vehicle just hit 40 k miles and has 4 payments until it is ours. Lovely. The question is to attempt to fix- which it looks like nobody has really had any success and chevy doesn't care or to get rid of? The vehicle is great besides these issues. It is the most comfortable and would recommend if there wasn't this issue. But, now I may second that thought. Don't want my friends to go through this. Unhappy..
  • Well, 3 more days in the shop (8th visit overall) and they still have no clue. This time they sent me home with a 10-page "conditions checklist" to complete the next time that it happens. This is BS. I am ready to escalate.
  • t_text_tex Posts: 25
    My 2009 Tahoe is still in the auto electric specialty shop here in Houston. They are making progress. They have found some damaged wiring in the dash and are methodically checking each module on the GMLAN system to make sure each module is working AND has the most current software update. It's slow going but very methodical and necessary. All auto electrical problems can be fixed - it's just finding the right shop that has techs who are trained and willing to take the time to properly diagnose and repair the more complex GMLAN system issues. As I mentioned before too many dealer shops just don't have techs with proper training in complex GMLAN troubleshooting and definitely have a financial motivation for finding the quickest solution and sending you on your way so they can get to the next throttle body replacement or other simple but high dollar repair.
  • 80-90 percent of the time when I open a door, the back hatch pops open at the same time. Sometimes after I close the hatch and then close the door that hatch pops open again. This can go on repeatedly but sometimes it's just once. My concern is that if I don't remember to close the hatch the battery can die, which it has once. Would changing the battery help? Any other ideas? Thanks!
  • I have a 2007 tahoe ltz. It has 56000 miles on it and just started having the electrical problems. However reading some of the other posts I am realizing this is a major issue. The tahoe started acting up a year and a half ago with the tire presure monitor not reading but it was intermintent. Now it is doing what the others are doing all my dash warning lights go on, door locks go crazy, all my gauges die, service trans message, loss of power, its bad. I am taking it in next week and praying they can fix it. I have found that it happens when I hit the brakes. The other day I was just sitting in front of my house and slowly moved forward and lightly pushed the brakes and everything went haywire. My wife came up put my daughter in her seat and slammed the back door and everything went back to normal. Then she got in the passanger side and closed that door and everything went crazy again. Weird, but seems like it must be the wiring is loose or has a short. Remember the recall for the wiper blade fluid they supposedly fixed by turning off, the letter I recieved said it could cause other systems to malfunction. Looks like it did. I am not happy. This is an expensive vehicle with barely any miles. I am giving them a chance to fix it other wise I will tell them to keep it. Its not safe anymore, my family my life rides in that car and now its giving me anxiety every time my wife drives it. Not worth it at all. I refuse to pay for something that i cant trust. i feel like i went to a shady carlot and bought the cheapest thing piece of crap I could find. If GM wont own this problem I will NEVER by another GM vehicle. Time to go with the Toyota.
  • t_text_tex Posts: 25
    edited December 2011
    You're right about the safety concern - it's not safe. GM must definitely know they have a problem with the GMLAN system. Whenever an apparent small wiring problem or short can throw a vehicle into the kind of electrical chaos that we've experienced with our GM vehicles, something is just not right - it has to be poor engineering. Unfortunately, GM does not want to take accountability for the design flaw. So far it's probably been cheaper to pay lawsuit settlements on lemon law claims and injury/death claims from accidents caused by these issues than have to recall hundreds of thousands of vehicles but these complaints are starting to get traction with consumer groups and consumer advocates/attorneys. They are just not going to be able to sweep a problem this big under the carpet.
  • erw3erw3 Posts: 6
    I have a 2009 Chevy Tahoe with the same cycling problems that are listed throughout this forum. Has a vehicle ever been fixed? I brought my Tahoe into my local dealership and they put some electical grease on the wiring, strapped the wires together...basically put a band-aide on the problem. They did print me out a service bulletin about this very thing that GM issued: Document ID: 2665828 #08-07-30-021F: Loss of HIgh Speed GMLAN Communiciatons, Intermittent No Crank, IP Gauge Fluctation, Intermittent Door Lock Cycling/Chime Operation, Various IP warning Lamps Illuminated Trans May not Shify (Sept 14, 2011) my question is if they know about this problem to put out a service bulletin and the technicians have tried the 'fixes' and they still don't what? I am really starting to get frustrated and all I ask is to have a vehicle i paid a lot of money for to work!
  • erw3erw3 Posts: 6
    I received this bulletin from my local GM is well aware of the problem...Document ID: 2665828 #08-07-30-021F: Loss of HIgh Speed GMLAN Communiciatons, Intermittent No Crank, IP Gauge Fluctation, Intermittent Door Lock Cycling/Chime Operation, Various IP warning Lamps Illuminated Trans May not Shify (Sept 14, 2011)
  • Sorry to hear about your problems. No, my vehicle has not yet been fixed. I dropped it off again this morning (8th or 9th visit?). I have no reason to believe that they will any more successful today than they have been in recent months. I now have the name of our District Manager. I am going to escalate and see what happens. Oh, and my auto-ride suspention decided to stop working. The compressor kicks-on but the vehicle does not raise. I regularly tow horses around and the nose of my truck now points toward the sky. I hope that they can figure it out in short order.

    I have owned over 20 GM vehicles in my lifetime and this is the very first Dud that I have had.

    I'll post status on my repairs. Please do the same on yours.
  • 25k miles/engine control module went out. Just prior to that a sensor of some sort. Piddly stuff since then until yesterday. Now I have 90k miles, truck 3 1/2 years old. While changing the right fog lamp ($26 for a lamp, yeesh) I went to start the truck and noticed an "electrical system charging malfunction" notice on the DIC. Shut off truck, restarted, same message. Third attempt, same message. Parked truck and restarted 10 hours later. No error message. Drove truck approx 30 miles, parked, shut down for 5 minutes, went to remote start vehicle, vehicle started then shut right down. Any ideas before I haul the thing into the dealer at $100hr labor? Minnesota vehicle/cold weather conditions. Adding insult to injury, truck had an oil leak fixed under warranty. Oil leak apparently is back since I checked the oil and it was 2qts low. Thanks.
  • Wow. I just posted the issue I have with my Tahoe and then started reading comments in here. This is disgraceful. All of the issues appear related. What disgusts me is my vehicle listed for $48,000 (2008 Tahoe LTZ). At that kind of price, these vehicles should operate flawlessly. What's even more disconcerting is while I didn't see if people are paying every time they bring their vehicle in, but some people 8-9 times in for the same issue. I sure hope in Gods name that you're not getting charged every time.
  • I am having the same issues on my 08 Tahoe. I took it to the dealer for service a few weeks ago and they were unable to replicate. The problems stopped for a while, however they started again this morning with the door locks going up and down and the console flashing on and off. My wife is taking it to the dealer again as I am writing this post. I've read on other sites that the issue is related to a faulty battery cable. Even if the dealer is unable to replicate the problem this time, I will have them replace the cable. There is a Technical Service Bulletin (TSB) out for this issue:

    TSB #PIT-4816A
    NHTSA ID #10032396
    Date Announced:
    APRIL 01 2011
    Additional Info:
    How to Fix
  • I have a 2008 Chevy Tahoe. The dome light will not come on when the doors open. I have checked the override switch and I have tried with the switch depressed and then not depressed. No difference. Any ideas what this may be? Could it be a bad switch? I can turn the dome lights on manually by turning the dome switch to one side. I want them to come on automatically when entering or exiting the vehicle.
  • samh33samh33 Posts: 1
    edited December 2011
    It's the positive battery cable that's at fault. Go out right now, and wiggle the cable near the fuse. I've had the same problem. I wish I could get rid of this thing because it has been nothing but an electrical nightmare for me.
  • I have the same problem. Let me know if you figure out what the fix is.

  • 2007 LT-3 w/ 59000 miles -- Truck ran fine for two weeks after purchase. 5 days ago, slow start... 4 days ago, NO start. Dead Battery. Battery:OK, ALT:OK, -- took to trusted mechanic for diagnosis....

    Mechanic tells me: When you start the truck, all "modules" come to life. When you shut truck down, all "modules" have a rest period before going into hybernation. Mechanic says that one (or more) of my modules is NOT hybernating, and since they require a 12 volt power source this is my battery drain. OBD-II diagnostics revealed a GMLAN code -- something about HIGH SPEED BUS CIRCUIT??

    What is the GMLAN code? How do I fix? HELP!! Just spent $25k on this truck and feel like driving it through the showroom floor windows of the dealership I bought it at (which for now will remain nameless in the hopes they will provide some kind of assistance).

    Any ideas???????
  • 2007 Tahoe LT-3 w/ 59000 miles -- Truck ran fine for two weeks after purchase. 5 days ago, slow start... 4 days ago, NO start. ACTED like a Dead Battery, BUT lights, radio, etc. still working!! Have had same problem and had to jump start Tahoe every morning and everyafternoon when leaving work. No aftermarket ANYTHING installed - just factory Rear Entertainment System (no NAV either). Don't even have a phone charger plugged in!!

    Took to parts store for load testing --Battery:OK, ALT:OK, -- took to trusted mechanic for diagnosis....

    Mechanic tells me: When you start the truck, all "modules" come to life. When you shut truck down, all "modules" have a rest period before going into hybernation. Mechanic says that one (or more) of my modules is NOT hybernating, and since they require a 12 volt power source this is my battery drain. OBD-II diagnostics revealed a GMLAN code -- something about HIGH SPEED BUS CIRCUIT??

    I have read multiple posts concerning this issue we are all having. Here is a compilation of fixes that other consumers have managed to squeeze out of dealers:

    1) Service Update #07007B where the BCM (Body Control Module) needs to be replaced;

    2) Technical Service Bulletin (TSB) 06162 which is a software update to the Body Control Module (BCM);

    3) HIGH SPEED BUS BAR overheats which simulates a dead battery (this info came from a bulletin dated April 2009, but I dont remember were i found it posted)

    4) Someone posted that Service Update #07007 is actually a RECALL pertaining to certain VIN#'s. I attempted to verify, but site that was linked to this information is no longer up (go Figure, right??)


    5) Bulletin #09-08-50-017B - Dated Feb 11, 2010
    Its the rear seat heater. It does NOT to be replaced, just reprogrammed using an SPS System w/ latest software update. Applies to Escalade, Tahoe, Suburban, Yukon, Yukon XL manufactured prior to November 30, 2009. ALL affected vehicles equipped with Rear Heated Seat RPO KA6.

    GM has to know what the issue is here... I just want to fix the problem, NOT sell the truck. If anyone has additional info, or has been able to resolve the issue -- PLEASE post a response !!!!!!! Feel free to email me and I will forward the long version of everything I have.

    Mike D
    South Alabama
  • ghosk, did you ever get the problem fixed? I have the exact same problem on my
    2007 Tahoe LTZ. 4 times in the past two weeks now. I will park the Tahoe, and go to lock it with the remote and it will not lock. So then I go back to the vehicle to find that nothing is working. I get back in and try to turn the ignition but nothing. Like you, the battery is not the problem. Then the doors start with the clicking noise. The first 3 times this went on for a few minutes and then all of the sudden the car started and everything was normal. Tonight it happen when I got home from work and it still will not come back to life. Everything is dead. Except for the battery.
  • t_text_tex Posts: 25
    edited January 2012
    My 09 Tahoe was in specialty auto electric shop for a couple of months. Picked it up last week and have about 500 miles with no problems whatsoever. They found several modules that were the wrong part number - onstar (VCIM), radio, rear seat radio/module and the instrument panel cluster. They updated all the other modules in the GMLAN system. They took the time to methodically go thru every module and associated component - the Chevy dealer just threw up their hands to say "I dunno". The dealer techs are inexperienced and are on a pay schedule that isn't compatible with repairs like this that require experience and willingness to troubleshoot. However, I still think the main problem is the GMLAN system's inabiltity to troubleshoot itself. It's poorly engineered, period. Although I like my 07 Tahoe that's never had a problem, the fact that the dealer could never solve my electrical problems with my 09 Tahoe is enough for me to say that I'll never buy another GM vehicle. Never buy a GM vehicle. Never buy a GM vehicle, get it?
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