Forum Discussion
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.
38 Replies
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
I have 2025 Buick Enclave as well.
My brand new (7 days old) 2026 Enclave is in the shop waiting for this part because OnStar continues to drain the battery and the car won't start after sitting overnight. GM and the dealerships are well aware of this issue as it's been going on for over a year. We were told GM won't change anything because "it doesn't happen to every car," so they'd deal with it as it happens. They clearly don't give a sh*t about doing the right thing. This should be criminal.
This isn't the new Enclave ownership experience we wish for you to have. It's our goal to make a good first impression, and it doesn't sound like we've met that mark. If you would like an additional layer of assistance through this process alongside your dealership, please feel free to private message OnStar_Support with additional details. Just select the envelope icon at the top right of your screen to get started.
Well, I certainly didn't want to discover a post like this. I just bought a brand-new Buick Envision on December 26th, and the battery has now completely drained on me twice in a month. Awaiting a jump as we speak. I'll point the local techs to the Onstar module, but I am very disappointed.
Hi everyone! Here's the latest: My Buick seems perfectly fine now and the service team at the dealership weren't able to replicate the problem; They performed every test they could think of including letting my car sit out over the weekend in the cold, but it's doing fine.
We suspect the problem is somehow tied to the *extreme* cold we just experienced thanks to that arctic blast. Our plan is that, if this happens again, NOT to jump it, but allow the dealership to tow it to service in the chance they can better diagnose it.Thank you for sharing your experience here. Please know that our team is just a private message away if you needed anything.
I am so sorry to hear this! I hope you get this resolved. It definitely been frustrating.
Thank you, I appreciate that! She goes in for service tomorrow morning. I'll post updates to this chat for anyone else that may happen across this post coming from Google or LLM search.
Your post is from three months ago. Were you able to sort out the issues with your own Envision?
This doesn't sound at all like something we hope to hear, @davidbx1. We would like the opportunity to learn more about what you've encountered with the battery in your Enclave and offer our assistance wherever possible while your concerns are addressed by your local dealer. To start, send us a private message to OnStar_Support with more details including your full name, VIN, mileage, email, phone and dealership name/location. Simply select the envelope at the top right of your screen to do so. Any other details you can share on where things stand at the moment are also appreciated to help our investigation. We will be watching to hear from you. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement.
Done! Thank you, Brendan!
I’m having trouble with my 2025 Buick Enclave as well. I have talked to lemon law attorney and they told me if it goes into shop for repairs 3 or more times or if the car is in the shop for over 30 days then it qualifies for lemon law. There are no fees from customers for attorneys they said they are paid through the lawsuits themselves. I’m going to start with NY state attorney general office. They also deal with lemon laws on vehicles. I hope many start the legal proceedings on this as there seems to be at least 6 different models I have read on this same issue. It’s time GM has to take care of this instead of customers getting screwed.
it needs a new module and they are on back order no reason for it to be in the shop all had to do is pull the fuss so it doen't drain the battery'
Pull the F8 fuse for onstar and it won't drain youd battery i just spent three hours at the dealer waiting for them to test and program something already new was bad then service adviser told me it was fixed when I got in the car it didn't work went into the show room floor went off sell manager and he got the service manger and got technician and they disconnected it show it wouldn't drain the battery. And we wait for the part it's amazing how factories aren't shut down waiting for the part.
GM is pathetic. I owned GM all my life but this is very last one.
We know how upsetting this concern with your OnStar must be, @storman2. While we are unable to expedite part deliveries or repairs, our team would still be glad to connect to provide you with support and updates during this process. To get started, please send us a private message with your full contact information, VIN, mileage, and the name of your preferred dealership. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.
Same situation here. 2025 Enclave Premium battery dead out of no where of course at 12, 400 miles. Repeatably now. Wont last overnight. I would really like to know who is fixing onstar or buick? Quit pointing fingers and figure this out.
pull the onstar fuss unti they get the new module
Your connection to share this insight after our last engagement is appreciated, @storman2. Our team is always reachable with a private message. Don't hesitate to send us one to OnStar_Support with more details on your situation if we can offer our assistance alongside your dealership while your vehicle is addressed.
Our team recognizes how impactful unexpected battery concerns are and would like to better understand how we can support. Allow us an opportunity to learn more by sending us a private message with your VIN, OnStar Account Number, and more details to OnStar_Support so we can look into this further. Just select the envelope icon at the top right of your screen to get started. We will watch for your outreach closely.
By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.
I have same issues. I have 2025 Buick Enclave preferred. My Onstar and navigation has quit working. I have been told it’s Onstar telematics module and is on back order not sure how long. They said possibly months. I called and talked to lemon law attorney and they said if vehicle goes in shop 3 or more times for same issue without it being fixed. Or if vehicle is in the shop for more then 30 days. Then it would qualify for lemon law. I have been in contact with GM Buick cares and talked to a few different people. They were trying to get it expedited. No luck with that. Trust me. GM doesn’t care. They have problems with several models. Buick Enclave Chevy Traverse Chevy Equinox Cadillac Lyrica. GM sierra Denali are the ones I’ve found out so far. My advice if they have had it in shop for more then 40 days I’d google n talk to lemon law attorney. Sounds like you have a winning case. Oh and lawyer also told me there’s no cost to the consumer that GM would be responsible for legal fees under lemon laws. Good luck 👍
We also spoke with an attorney, but we were told we do not quality for the lemon law because our vehicle has more than 12k miles. It was in the shop close to 40 days after 8 months of purchasing brand new.
We have been having the same issue and dealing with it now. Waiting on roadside assistance to come jump our car 🙄🙄 this is ridiculous.
We just wanted to send you another message letting you know that we'd be glad to assist further. To get started, please send a private message to OnStar_Support by selecting the envelope at the top right of the page.
Good morning, are you with Onstar or GM?
Our team is just a private message away if you need anything.
We want you to know that we are still here to assist you. Please send us a private message to connect with us for further assistance.
