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scjenisland's avatar
scjenisland
New Contributor II
6 months ago

2025 Buick Enclave - Ongoing OnStar / Battery Drain Issue

Hi everyone, I’m posting to see if anyone else has been dealing with the same issue. I have a 2025 Buick Enclave that I purchased brand new about nine months ago. From the start, I’ve had recurring problems with the OnStar system and a total loss of power. The vehicle has repeatedly gone dead or failed to start. The dealer told me it’s related to a defective OnStar (telematics) module that’s been draining the battery and preventing the system from going into sleep mode. My Enclave has now spent over 30 days in the shop, and we’ve had a case open with GM for weeks — but there still isn’t a confirmed fix or part available.  We have been enduring these issues while our brand new Enclave sits in the shop, and we have not received answers (from Buick or the dealer) for how it will be resolved.

I wanted to share this in case other owners are experiencing similar problems or have received any updates or resolutions from GM. If anyone from Buick or GMC sees this, please reach out — I’d really like to get this resolved.

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  • Tbeyer9607's avatar
    Tbeyer9607
    New Contributor II
    3 hours ago

    I have 2025 Buick Enclave as well. It started with On Star n navigation failing completely. They put in new OnStar telematics module and within about 2 months now battery completely dead overnight. Got it back to dealer and they are checking things out now. I have just also found on google search that the BCM. Bdy control module can have ether a short circuit or Parasytic draw. Which can lead to sporadic battery draw down as well. I’m calling dealer tomorrow to see if they checked the BCM as well. 
        I have also sent an email to GM CEO Mary Barra  email ( mary.barra@gm.com )this last weekend and she had an Exucutive administrative assistant reach out to me on Monday already. 
    There are different lemon laws in different states. You need to check with them to see if you vehicle may qualify for that as well. I’m sure hoping they get mine resolved I really like GM but this is leaving a very bad taste with me to say the least. 

    Thomas Beyer