2017 Bolt EV tapping noise

Discussion in 'Bolt EV' started by Walter, Feb 27, 2018.

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  1. Crazycatman

    Crazycatman New Member

    Yip it's the dealership....it's to be expected.
    I had installed a "Mouse Blocker" to prevent rodents from chewing up the wiring, and the 'technician' disconnected it, leaned on it and bent the bracket that I had made to hold the device and then left it disconnected!!!
    So as I said it could have been worse and believe me I've had worse.
     
    Eliot Carney-Seim likes this.
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  3. Eliot Carney-Seim

    Eliot Carney-Seim New Member

    That's insane!
     
  4. Scott K.

    Scott K. New Member

    I have a ‘17 (only 21,724 miles) that’s 4 1/2 months out of warranty. I was out of town for a month and when I returned 2 weeks ago it started doing the tap-tap-tap thing. Definitely the iBooster. I checked when opening the car door and got down by the brake pedal and it might’ve actually been moving very slightly; a push on it with my hand and it stopped the sound and movement. I’ve also pumped the brakes gently while powered up but parked, and it went away.

    I appreciate this forum which helped me to identify the problem, and my experience is the same as those who’ve had this issue.

    I guess Monday I’ll see if GM is going to cover this or if I’ll be out-of-pocket on it. I’ll get it fixed either way, I’m not going to live with it. I’ll follow up to let you know if GM will cover it out of warranty.
     

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  5. Scott K.

    Scott K. New Member

    Excellent video and audio, thank you very much!
     
  6. Eliot Carney-Seim

    Eliot Carney-Seim New Member

    I'll report back too. I'll make some noise at GM starting Monday and see what I can get.
     
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  8. patrickbolt

    patrickbolt New Member

    Thanks all, bc I just bought a used 2017 Chevy Bolt with 25,000 miles on. It has this EXACT sound. (I leased a 2017 Bolt until last week, then purchased a used one. My leased bolt never made this tapping sound through 41,000 miles). So my question is... HOW MUCH should I anticipate it will cost to fix the iBooster?
    I have no warranty so my fingers are crossed.
     
    Domenick likes this.
  9. Eliot Carney-Seim

    Eliot Carney-Seim New Member

    I got quoted 1800 to fix it. I'm in MD.
     
  10. patrickbolt

    patrickbolt New Member

    Thank you Eliot... Expensive.
     
  11. GetOffYourGas

    GetOffYourGas Well-Known Member

    I know that any unrepaired issue can and will eventually balloon into something much more expensive. That said, what exactly does this part do, and what is the harm of leaving it unrepaired? Is it a safety issue, or just something that will get more expensive later?
     
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  13. GetOffYourGas

    GetOffYourGas Well-Known Member

    I just got my car back from the dealer. My brake pads were worn way down to metal. They said the sound was in fact the booster but the problem was that it was working so hard due to the worn down pads. They replaced the brakes and sure enough, the tapping went away. I’m glad it did, as a brake job (which was necessary anyway) is cheaper than replacing the booster!



    Sent from my iPhone using Inside EVs
     
  14. Domenick

    Domenick Administrator Staff Member

    Brakes worn to the metal?! I'm not sure if I've ever heard of brakes on an EV getting worn down that much. Just curious...do you drive with light regen and have a lot of miles on it?
     
  15. GetOffYourGas

    GetOffYourGas Well-Known Member

    No, this confused me a little too. I do have 56k miles on the car, but I drive almost exclusively in L. I rarely touch the brake pedal. However, I live in upstate NY and we have lots of road salt in the winter. In order to control surface rust, I occasionally put the car in neutral and brake hard to a stop. Maybe I have been overdoing it.
     
  16. Domenick

    Domenick Administrator Staff Member

    That is strange, then. I doubt your rust clearing has that much effect... Maybe some other Bolt EV owners will appear with similar issues, since it seems wearing through the pads makes the tapping noise.
     
  17. GetOffYourGas

    GetOffYourGas Well-Known Member

    Well, this is the story that Chevy gave me, and it seems to match what happened. That said, I think others have resolved the issue with a software update? I did have the recall applied at the same time. And I hear they bundled the cold-weather charging performance into that update. Maybe it also included something for the iBooster? That's just me putting 2 and 2 together and running with it.

    I would love to hear if anyone else fixed the tapping with just a brake job (and no software update).
     
    Domenick likes this.
  18. KW7676

    KW7676 New Member

    After hunting around on this, just wanted to flag for folks that the Chevy Bolt Forum found a TSB from 12/11/2020 that says a software update is coming in early 2021 to address this and that the iBoosters are not defective and should not be replaced.
     
    GetOffYourGas likes this.
  19. In July of 2022 my Bolt went in for the 2nd recall with gm's help because the dealer can not be trusted. THE POINT IS
    at the same time they did a TSB to reprogram the iBooster. I heard that ticking for 1 1/2 years
    All good now.
     
    Domenick and GetOffYourGas like this.
  20. GetOffYourGas

    GetOffYourGas Well-Known Member

    Well the sound is back now. The brake job got rid of it for a time but not for good. How do I get GM to install this software update? If I go in and say I want an update I heard about on the internet, they will roll their eyes at me, charge me $100 to "look at the car", find nothing, and return it to me unchanged.
     
  21. Well I had to pitch a fit to get it done by calling gm.
    Ref
    2017-2018 Bolt EV Brake Booster (iBooster) thread on GM Bulletin #20-NA-170
    This info on .org Bolt site with the grey bolts in the header. Don't know how much is ok to say about that.
    The reprogramming takes about 15 min and it really works. The TSB tells the shop Do Not Replace iBooster
    Hope to be helpful
     
  22. GetOffYourGas

    GetOffYourGas Well-Known Member

    When you say you called GM, do you mean the local dealer, or did you call GM directly? If the latter, what number did you call?
     
  23. gm directly, the Bolt EV concierge 8667905600
    Good luck
     
    Domenick and GetOffYourGas like this.

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