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MY22 with 52K miles. Driving home last night and received a large "Malfuntion" messsage followed by the following messages. Had to limp home with heat set to 80 degrees. Normal operation this morning. Had 48V recall work for grounding issue performed 2 weeks ago. Perhaps that made it worse. Have to wait a week for MB service. Hope it lasts long enough.
Is this a 48v battery issue or a cooling system issue? I think there is a dedicated/aux cooling loop, with separate radiator, for the battery. I know about the radiator as I got a rock through my radiator under the car.
If the car started the 48v battery is good. The question is whether the battery caused the overheating of the coolant or the overheating of the coolant suggested the 48v battery is no longer being cooled. There is a radiator/cooling process specific to the battery. Not sure how it is linked to the main cooling circuit. I do know I lost all coolant when the battery radiator was punctured. Will be interesting to hear what the problem is.
The coolant pump is driven by the 48V battery. If the battery fails it is like breaking the belt on an older car
I initialy receivied a, generic, red "Malfunction" message, followed by the 48V battery message. A short time later, probably less than 2 minutes, I received the
"Coolant" message - I was on the highway.Therefore, if the battery failed first, then it is conceivable that collant would rapidly heat up. At the time of message, collant was at 224 degrees and increasing.
My concern will be service dept. telling me they "couldn't duplicate the issue."
My concern will be service dept. telling me they "couldn't duplicate the issue."
Here's hoping that they take good care of you and your vehicle! Good luck.
Mine has been solid for the last two years after the 48v died and left me stranded. Just got the ground connection recall in the mail today, so will have to get that scheduled.
My 2022 GLE AMG 63S got dropped off to the dealer this morning for the 48V ground check recall. Fingers crossed they don't mess it up.
Got my car back this afternoon after they did the battery recall work. I'm nervous now and waiting to hear how yours turns out, especially given the timing of your recall work. It's hard to guess how the two could be related, but who knows. Sure sounds like the battery overheated...... However, it seems your battery is now working ok. Good luck!
Got my car back this afternoon after they did the battery recall work. I'm nervous now and waiting to hear how yours turns out, especially given the timing of your recall work. It's hard to guess how the two could be related, but who knows. Sure sounds like the battery overheated...... However, it seems your battery is now working ok. Good luck!
My appointment is this Friday, 5/17. I will keep you posted.
Although it has been running fine since, I think about it whenever I go for a drive. However, as I mentioned earlier, I am concerned that I am going to get the "we couldn't duplicate the issue" or "couldn't find anything wrong" speach. Probably will not get it back before Monday evening, so look for a post on Tuesday morning.
My appointment is this Friday, 5/17. I will keep you posted.
Although it has been running fine since, I think about it whenever I go for a drive. However, as I mentioned earlier, I am concerned that I am going to get the "we couldn't duplicate the issue" or "couldn't find anything wrong" speach. Probably will not get it back before Monday evening, so look for a post on Tuesday morning.
Good luck with yours.
I've been thinking about this in case they can't "duplicate" the issue. If we assume that the battery overheated, causing the coolant temperature to go up, was there a period just before you got the message that the battery was charging for an extended period? For example, on mine, the 48V battery charges when you brake and a little when coasting, etc. Maybe overcharging during an unusual charging event caused it to overheat? That "could" explain why it happened once but is normal now. Maybe a fault in the charging system and not the battery? Just reaching for ideas...... Also, I assume you checked the coolant level to make sure it is not low. I think the battery cooling circuit is separate from the other systems, but I know the coolant source is common. When I lost my battery radiator, it drained the entire system. Look forward (anxiously) to hearing what your dealer says.
My concern will be service dept. telling me they "couldn't duplicate the issue."
I can totally empathize with being concerned over this, especially given the safety concerns with high power systems and with how an inoperative 48v battery can leave you stranded (ask me how I know).
With how these error messages you’ve seen are stored on-board and with MB’s 48v issue history, my guess is that the dealer will be all over this issue for you. My bet is that you might be without a vehicle for 4-5 days while they secure parts, but once fixed, you won’t half to think about it again. Fingers crossed!
Last edited by Charcharius; May 16, 2024 at 09:00 AM.
I've been thinking about this in case they can't "duplicate" the issue. If we assume that the battery overheated, causing the coolant temperature to go up, was there a period just before you got the message that the battery was charging for an extended period? For example, on mine, the 48V battery charges when you brake and a little when coasting, etc. Maybe overcharging during an unusual charging event caused it to overheat? That "could" explain why it happened once but is normal now. Maybe a fault in the charging system and not the battery? Just reaching for ideas...... Also, I assume you checked the coolant level to make sure it is not low. I think the battery cooling circuit is separate from the other systems, but I know the coolant source is common. When I lost my battery radiator, it drained the entire system. Look forward (anxiously) to hearing what your dealer says.
Vehicle was parked for about 5 hours. I drove 3-4 minutes on local roads, then entered highway. Within 5-10 minutes later, I received the first message, which was simply "Malfuntion". A few seconds later was the 48v, then 2 minutes later was the Coolant message - I checked the timestamp on photos. I then had to ride the shoulder in "limp" mode. I deceided to turn up the heat to reduce coolant temp, and that worked, as I was able to resume driving a few minutes later. I have no idea how to check the battery coolant level - didn't even know there was one.
I can totally empathize with being concerned over this, especially given the safety concerns with high power systems and with how an inoperative 48v battery can leave you stranded (ask me how I know).
With how these error messages you’ve seen are stored on-board and with MB’s 48v issue history, my guess is that the dealer will be all over this issue for you. My bet is that you might be without a vehicle for 4-5 days while they secure parts, but once fixed, you won’t half to think about it again. Fingers crossed!
Thanks!. Not so much concerned as to how long it would take, as long as they are able to determine and resolve the issue.
The results are in...
Picked up the vehicle on Friday evening. There was nobody around to discuss the results with.
1. 48V battery - they found a "Stuck Actuator" - not sure what that this has to do with a bettery; perhaps charging. However, if it was stuck, then the problem should have continued for the week that I waited for the appointment.
2. Coolant Temp. - They found no isues with level or leaks; therefore I am going to presume it was related to battery issue, which caused lack of circulation.
The results are in...
Picked up the vehicle on Friday evening. There was nobody around to discuss the results with.
1. 48V battery - they found a "Stuck Actuator" - not sure what that this has to do with a bettery; perhaps charging. However, if it was stuck, then the problem should have continued for the week that I waited for the appointment.
2. Coolant Temp. - They found no isues with level or leaks; therefore I am going to presume it was related to battery issue, which caused lack of circulation.
That looks like "It's working fine now, we're not doing anything."
It seems like the "48v Battery" warning is a generic warning for something on the 48v power bus setting a DTC.
The results are in...
Picked up the vehicle on Friday evening. There was nobody around to discuss the results with.
1. 48V battery - they found a "Stuck Actuator" - not sure what that this has to do with a bettery; perhaps charging. However, if it was stuck, then the problem should have continued for the week that I waited for the appointment.
2. Coolant Temp. - They found no isues with level or leaks; therefore I am going to presume it was related to battery issue, which caused lack of circulation.
This makes sense. The actuator stuck causing the battery to overcharge which caused the overheating. It is now clearly "unstuck" and charging normally. You may have noticed that the charge indicator stayed on while it was overcharging. This would imply the actuator is mechanical which is surprising. Digital controllers typically don't get "stuck". The question now is why didn't they replace the actuator and did the overcharging damage the 48v battery?
This makes sense. The actuator stuck causing the battery to overcharge which caused the overheating. It is now clearly "unstuck" and charging normally. You may have noticed that the charge indicator stayed on while it was overcharging. This would imply the actuator is mechanical which is surprising. Digital controllers typically don't get "stuck". The question now is why didn't they replace the actuator and did the overcharging damage the 48v battery?
I think you're reading too much into it. All we know is:
There was a warning about the 48v battery
Then a warning about the engine coolant being too hot
Now we also know there was a stuck 48v actuator.
This leaves lots of questions.
What does the actuator actuate?
Is it simply a translated term for a relay?
Was it for the coolant pump or something else?
Why was the message for the 48v battery if it was an actuator that failed?
Did the entire 48v system shut down?
And of course finally
Why did the engine coolant get hot?
Knowing that the coolant pump is 48v and the coolant got hot after the warning it's likely that the coolant pump stopped after the warning. Nothing from the service report indicates that the 48v battery itself was overcharging, got hot, has active heating/cooling, or any other issues. The MB technicians likely also don't have the answers to these questions highlighting the frustrating part of troubleshooting modern vehicles.
I think you're reading too much into it. All we know is:
There was a warning about the 48v battery
Then a warning about the engine coolant being too hot
Now we also know there was a stuck 48v actuator.
This leaves lots of questions.
What does the actuator actuate?
Is it simply a translated term for a relay?
Was it for the coolant pump or something else?
Why was the message for the 48v battery if it was an actuator that failed?
Did the entire 48v system shut down?
And of course finally
Why did the engine coolant get hot?
Knowing that the coolant pump is 48v and the coolant got hot after the warning it's likely that the coolant pump stopped after the warning. Nothing from the service report indicates that the 48v battery itself was overcharging, got hot, has active heating/cooling, or any other issues. The MB technicians likely also don't have the answers to these questions highlighting the frustrating part of troubleshooting modern vehicles.
Battery overheating or coolant pump stopping "makes sense". Not sure about the other stuff.. In any case he hopefully figures it out.
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