23 EQS 580 in service shop for 30 days due to no battery communication
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From: New England/Florida
2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
23 EQS 580 in service shop for 30 days due to no battery communication
My 23 EQS sedan has been in the shop now for 30 days trying to fix a “lack of communication” between the hi voltage and 12 v battery. My car was stored in my garage for the summer and eventually the 12v battery went dead despite a trickle charger on it. I even tried a regular charger on it and could not get battery to charge. Car was flat-bedded to dealer 30 days ago. Also error messages occurred when they tried to charge the hi voltage battery. When the truck came to tow my car the hi voltage was at 64% SOC. When they took the car into the shop and replaced the 12v battery the SOC now reads 34%. Dealer couldn’t figure out the problem so Germany engineers involved. Latest is control unit on order from Germany, another week in shop. If that doesn’t solve problem, the next step is to replace the hi voltage battery. So it looks like at best I won’t get my car back for 5 weeks and at worst who knows?
Any thoughts? Some people have suggested I try lemon law. Not sure if it qualifies. I bought the car in RI and now is in Florida where I keep the car. Has anybody had the dealer buy back the car and at what price point. I really liked the car when it was working but find this getting a little ridiculous it’s taking so long to figure out just what the problem is.
Any thoughts? Some people have suggested I try lemon law. Not sure if it qualifies. I bought the car in RI and now is in Florida where I keep the car. Has anybody had the dealer buy back the car and at what price point. I really liked the car when it was working but find this getting a little ridiculous it’s taking so long to figure out just what the problem is.
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From: Maryland, USA
2022 C300 AMG-Line; 2020 E450; 2013 SLK350; 2023 EQS580
Every state has its version of the Lemon Law, so maybe consider looking into it for FL, as a backup option. At this time, my counsel is to remain patient to see all issues fixed and resolved to your satisfaction BEFORE taking delivery of it from the dealership repair service team. Go over the car with a fine tooth comb... even ensure all s/w updates are installed and there are ZERO errors on the diagnostics. If not, simply demand a new battery be installed to cure it for good. Hope the car is still under factory or extended warranty to qualify for new battery, which may be the final solution to these issues. Good luck.
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From: New England/Florida
2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
Fortunately the car is still under original warranty. I really do like how the car drives and in reality not looking to get rid of it but I would hate to have something like this happen when car is out of warranty. I’ve also had issues with OTA map updates never working from day one. I can do it manually but the car is designed to do them automatically and despite having the service tech do everything they could think of in updating software etc, they never have worked. That’s not a huge deal, but again I paid plenty for the car and would like it to work as designed.
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2022 C300 AMG-Line; 2020 E450; 2013 SLK350; 2023 EQS580
The battery is warrantied for 10 years or 150K miles, I understand. So it should be OK for MB to replace as long as within those terms. I agree completely with you that it makes out of warranty scary on these cars.. thankfully, our 580 SUV is under factory warranty till 2027 and then CPO to 2028. Even then, I may consider an extended warranty after it ends in March 2028 to avoid these types of issues in the future.
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2010 E350 4Matic
My 23 EQS sedan has been in the shop now for 30 days trying to fix a “lack of communication” between the hi voltage and 12 v battery. My car was stored in my garage for the summer and eventually the 12v battery went dead despite a trickle charger on it. I even tried a regular charger on it and could not get battery to charge. Car was flat-bedded to dealer 30 days ago. Also error messages occurred when they tried to charge the hi voltage battery. When the truck came to tow my car the hi voltage was at 64% SOC. When they took the car into the shop and replaced the 12v battery the SOC now reads 34%. Dealer couldn’t figure out the problem so Germany engineers involved. Latest is control unit on order from Germany, another week in shop. If that doesn’t solve problem, the next step is to replace the hi voltage battery. So it looks like at best I won’t get my car back for 5 weeks and at worst who knows?
Any thoughts? Some people have suggested I try lemon law. Not sure if it qualifies. I bought the car in RI and now is in Florida where I keep the car. Has anybody had the dealer buy back the car and at what price point. I really liked the car when it was working but find this getting a little ridiculous it’s taking so long to figure out just what the problem is.
Any thoughts? Some people have suggested I try lemon law. Not sure if it qualifies. I bought the car in RI and now is in Florida where I keep the car. Has anybody had the dealer buy back the car and at what price point. I really liked the car when it was working but find this getting a little ridiculous it’s taking so long to figure out just what the problem is.
Last edited by MBNUT1; Nov 20, 2025 at 07:10 PM.
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2010 E350 4Matic
The battery is warrantied for 10 years or 150K miles, I understand. So it should be OK for MB to replace as long as within those terms. I agree completely with you that it makes out of warranty scary on these cars.. thankfully, our 580 SUV is under factory warranty till 2027 and then CPO to 2028. Even then, I may consider an extended warranty after it ends in March 2028 to avoid these types of issues in the future.
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2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
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At the very least, I would ask Mercedes corporate to extend your warranty to whatever the max type of extended coverage is.
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From: New England/Florida
2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
Got the news today module they ordered did not fix the problem and Mercedes approved replacing the hi voltage battery. Thankfully covered under warranty.
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From: California
2024 EQE Sedan
Well, seems that there are similar issues with failures of gasoline engines needing the entire engine to be replaced, and the same holds for transmissions. Not sure that there is any vehicle that we can be sure will not potentially need major repairs.
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From: New England/Florida
2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
After approximately 2 months I finally got my car back today. They ended up replacing both the hi voltage and 12 v batteries. Drove it home and all seems well. They charged it up at dealer so I haven’t tried charging myself. Thank god for warranty. Dealer is billing Mercedes $57260 for the work they did. My cost:$0.
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From: Iowa
2008 CL550, 2022 EQB 300, 2023 EQS 450 4Matic
I watched the YouTuber Car Care Nut take a detailed look at a newish W223. We are entering the era of disposable cars, ev or ice. They are meant to last until the end of the warranty, with little or no thought to fixing it ten years later. The quality (or lack thereof) and the servicability of the W223 was appalling, and the Car Care Nut is an S class fan. I'd take an EV over ice for ten years, as at least we have the battery warranty. I would expect the generous 10 year/155,000 mile warranty to shorten over time to better align with the typical 4 year/50,000 mile, as MB is going to pay out a lot of $57,000 warranty claims over the next ten years. I saw a European YouTuber mention that while everyone worries about efficiency regarding carbon footprint, cars also need to be scored for durability and servicability for keeping them on the road for a long time. The carbon impact of not building a new car is zero. And as long as I'm on a soapbox, I won't be buying any new car for many years. The prices of the cars on the floor at my MB dealer--insane. Thankfully I'm very happy with both my EQB and EQS--lucked out on great build packages and bought them both at good prices. There will be no replacements for many years.
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From: New England/Florida
2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
I was concerned about this very fact. I really like the car and am not in the market for a new car just yet. From what I’ve been reading about resale prices, the cost of repair of my car had to be close to its value. Couple of friends said they were surprised Mercedes replaced battery at that cost. At least I have my car back with new batteries, and only 11 k on it. It looks as new as I day I picked it up. Hopefully I will get many more years out of it.
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This is what I always think when someone complains about having to get a new battery at x amount of miles...if I ended up with a new battery at, say, 75,000 I would be thrilled! 11,000 is short for the bother, but what if I got a new battery dropped in my EQS at 125,000 miles? That would be amazing. As for MB opting out of replacing due to cost...maybe a lawyer on the site can chime in but I don't think that is the case. They warranty the car, not the car based on its market value like an insurance company. Battery prices are high, but they will likely drop in the coming years (but then again, this is MB so maybe not). I was at the parts counter yesterday at my local dealer and saw the sweatshirt I bought less than a year ago was now 50% more expensive.
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From: Cincinnati
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This is what I always think when someone complains about having to get a new battery at x amount of miles...if I ended up with a new battery at, say, 75,000 I would be thrilled! 11,000 is short for the bother, but what if I got a new battery dropped in my EQS at 125,000 miles? That would be amazing. As for MB opting out of replacing due to cost...maybe a lawyer on the site can chime in but I don't think that is the case. They warranty the car, not the car based on its market value like an insurance company. Battery prices are high, but they will likely drop in the coming years (but then again, this is MB so maybe not). I was at the parts counter yesterday at my local dealer and saw the sweatshirt I bought less than a year ago was now 50% more expensive.
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Can you please post the part number of the new battery, the dealer should list that on the service order. I am in the same situation and the dealer is trying to figure out which is the current part number for the battery. They told me today that there is no ETA but then indicated that they were not sure what is the part number for the replacement battery.
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From: New England/Florida
2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
Can you please post the part number of the new battery, the dealer should list that on the service order. I am in the same situation and the dealer is trying to figure out which is the current part number for the battery. They told me today that there is no ETA but then indicated that they were not sure what is the part number for the replacement battery.
001-982-80-08.
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this part number is for the 12v battery, I believe the Lithium high voltage battery part number is starting with 789. The part number that given to be is 789 340 03 43 , but when I looked it up , it was discontinued.
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From: New England/Florida
2005 SL 500. 2015 S550. 2016 GLE400 2018 S560
789-340-58-45
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From: California
2024 EQE Sedan
Don't be too surprised about parts being discontinued. Automobiles receive constant updates during manufacture, so it is not surprising that a part that might have been used when the car was built has been replaced by an updated part in the inventory today. Usually they are drop in compatible without issue.
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thank you for taking the time to look this up, this part number is for the core return, don’t worry about it, I was curious to see if we receive the new battery of 118 kWh capacity instead of the 108 kWh that came originally came with car. The 2023 battery part number was long discontinued and all the remaining numbers shows 2024 and 2025 in the computability section. The 24/25 model years came with the bigger battery
