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Thread: 2006 C6 Auto - electrical issue - can't find cause

  1. #16

    Default Update -- 6/14/15

    Quote Originally Posted by Samik View Post
    The only error that was shown was the failure to communicate. I was asked if the car was recently serviced for the headlight recall, to which the answer was yes. The vehicle was in inoperable, they couldn't get it to do anything. The tech took apart the fuse box and put everything back together, and the car started right up and is running perfectly. However Time will tell, it seems I could not go more than a week without an issue with the gauges and electrical acting up. The Tech thinks that the previous headlight recall work was not done properly.

    I will post an update in a week or so or sooner if something happens again.
    The car has been driving fine for 5 days, and then all of a sudden today, it started acting up again while I was driving. Although I was able to keep driving, the gauges would intermittently work and then go out again. The security light stayed on. I was able to drive it to the dealer, and that is where it sets.

    If the dealer cannot find the problem, I'm going to trade the car in. I am at a complete loss and so frustrated, I think I am going to end up with a Hyundai.

  2. #17

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    It seems like my recent reply didn't post, sooooo. I was driving yesterday after almost a week of the car driving fine. Just like before, the gauges started going crazy, the radio died and the AC went off and back on. I was able to keep driving so I dropped it off at the dealer, no word yet this morning. This is really a nightmare.

    What would cause the error codes to disappear? What part of the system stores the codes?? I think I am going to end up taking a loss and trading the care in .....

  3. #18

    Default

    HI there,

    I would most likely trade the DEALERSHIP IN.

    There will be codes in multiple modules, and there will be something that will NOT DISAPPEAR.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
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  4. #19

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    3rd attempt at posting ...

    Yesterday the car started acting up while I was driving. i dropped it off at the dealership. They think it is the BCM since the unit should have error codes but doesn't. Recap .... the first dealership changed out the BMC and RCDLR(?) and the car still acted up after that point, and has done so several times since then. The new service guy thinks that the new unit (which is in the car now) may be a bad unit. . . . .

    Does the BMC hold the codes???

  5. #20

    Default

    HI there,

    All modules will throw codes based on system diagnostics.

    Even if the BCM did NOT set codes, other modules in the system will.

    I doubt that there is a system problem with the BCM if it has already been replaced with an new GM system.

    At this point, based on all that you have done, you will have codes in multiple modules and I do not believe that they are giving you all the details.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
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  6. #21

    Default

    Quote Originally Posted by c4c5specialist View Post
    HI there,

    All modules will throw codes based on system diagnostics.

    Even if the BCM did NOT set codes, other modules in the system will.

    I doubt that there is a system problem with the BCM if it has already been replaced with an new GM system.

    At this point, based on all that you have done, you will have codes in multiple modules and I do not believe that they are giving you all the details.

    Allthebest, Paul
    3rd attempt at posting ...

    Yesterday the car started acting up while I was driving. i dropped it off at the dealership. They think it is the BCM since the unit should have error codes but doesn't. Recap .... the first dealership changed out the BMC and RCDLR(?) and the car still acted up after that point, and has done so several times since then. The new service guy thinks that the new unit (which is in the car now) may have been bad out of the box . . . . .

    Does the BMC hold the codes??? What could cause there to be no error codes????

  7. #22

    Default

    Paul,
    This is the second dealership - I can't imagine both giving me inaccurate information regarding the codes. Have you ever experienced or can you think of what could cause 'no codes' to be found anywhere?? I asked if they used a tech2 tool, and they have. My only guess is an electrical short somewhere???
    Thanks
    Sami K

  8. #23
    Join Date
    Jul 2008
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    San Antonio, TX
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    1,949

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    I agree with Paul. It sounds like you need to find a new dealer or shop. While it is technically possible that a unit could be "bad" right out of the box, the chances of that are so small I wouldn't even consider that at this point. When a new BCM is installed it must be programmed, including all your car's RPO codes, for your vehicle. If that is not done properly, then you will still have issues. It can even create new issues you didn't have before.

    Also as Paul says...there should be error codes.
    http://www.crossedflags.com/forum/signaturepics/sigpic4_1.gif
    2001 Dark Bowling Green Metallic Coupe - 6-spd and mods (400 rwhp)
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  9. #24

    Default

    Well, the car is still at the 2nd dealership. They have used a GM tech2 tool, and still no codes. The car is NOT acting up at the moment, so they are trying to get it to do so. I can't believe that both dealerships would give me information that was not true. So, can you think of anything that could cause the problems I am having while not leaving any codes??? Also, I have asked if there is a monitoring tool that I can keep connected to the car while I am driving it so that when it does act up, I can capture the codes. Is there such a tool??? The service mgr stated that there is something like that, and he will request it, but it there something I can get since he is not sure he can get one??
    Thanks again,
    Sami

  10. #25

    Default

    update 06/29/15
    Well, I finally spoke to the technician working on my car. They do have codes, too many of them. The failure to communicate indicates it could be any of 12 modules, but that's it. I took the car in last week while it was acting up, drove it into the shop so I didn't have to turn it off, left it in neutral (with the brake on) and the technician moved the car into the bay as I was walking away .... and the car started running PERFECTLY once again. I think I am a jinx. They could not get it to act up after 100 miles. I took the car today and put another 50 miles onit, and it ran fine although a couple issues ill list in a minutes. Any idea what could cause so many errors within the 'failure to communicate'??

    While driving today, mostly on freeway then on side streets, I stopped and kept the car in gear with my foot on the brake .... the voltage got down to about 12.2 and came right back up when I started moving. Also, at one point, the AC stopped blowing cold air for a few minutes - mind you, it is a 110 outside, but then cooled right down when I started driving. Is that normal when it gets so hot outside? The temperature of the car got a hair past the 220 mark, but came right down as well.

    I have the car once again and am trying to get it to act up so I can take it into the shop. Here is 'wild card' thought. When this initially happened at the first dealership, they thought the problem was fixed after changing the RCDLR and BCM. They called me to pick up the car, and as soon as I got in the car (in less than a minute) it started acting up again. I have an IPhone 6 that is jailbroken (rooted). I am wondering if a jailbroken IPhone could possibly cause interference ?? I know, it sounds crazy ... I un-jailbroke my phone - and didn't have any problems with the car so far today.

    Thoughts?

  11. #26
    Join Date
    Jul 2008
    Location
    Ontario, Calif.
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    3,007

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    The multiple communication failure of so many modules is probably being caused by 1 module killing the communications network so that nothing can communicate. If the offending module is intermittent then it will be fun to try and find. Usually when the problem is happening you would start disconnecting 1 module at a time and see when communications comes back.

    I wouldn't think a jailbroken phone would cause the problem. One way to tell would be when it starts happening again; turn the phone off.
    2015 Stingray Z51 w/ Magnetic Ride Control & 8-speed Automatic


  12. #27

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    HI there,

    Im sorry but 'too many codes' means that no one wants to funnel through them all and accurately determine what is going on.

    I know those codes can be used to find root cause.

    Allthebest,Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
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  13. #28

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    So, what the tech said is that the codes could lead to any one of 12 modules. Is the only way to figure this out is to replace the modules one at a time? What should I tell the tech to do???

  14. #29
    Join Date
    Dec 2011
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    Washington State
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    Quote Originally Posted by Samik View Post
    So, what the tech said is that the codes could lead to any one of 12 modules. Is the only way to figure this out is to replace the modules one at a time? What should I tell the tech to do???

    Since you spent money at this dealership, and the tech is having problems being able to determine the problem, insist that the tech (and only a tech, not a service advisor or a manager) call his GM technical support line so that they can walk him through the diagnosis. Make sure that the dealership gives you in writing what the tech support line advised the tech to do to diagnose the issue. Good luck with it.
    20+ years ASE and Honda Master Tech

    1998 black 6 spd convertible

  15. #30

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    Hi there,

    I am not trying to be rude but take a look at my first response. You have been mislead again and again.

    I stood by my comments then, and I do now.

    You will need to list every single control module, with every single code that was listed.

    if I do NOT HAVE COMPLETE INFORMATION, I cannot possibly guide you to a root cause.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
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