Pre Safety Functions Limited
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
Pre Safety Functions Limited
Over the weekend my battery went dead as my wife left a light on inside the car. I user her car to jump the E550 however once it was running again I get the "pre safety function limited" error when running the car. The cruise control, pre brake and other features no longer work. I checked the fuses and gave the car a wash as from reading other threads that error generally has to do with dirt on the sensors not a issue with them.
Any one have any idea on what this could be? The only thing I could think of would be something happened when I jumped the car. But if that was the case I would get a different error msg.
Any one have any idea on what this could be? The only thing I could think of would be something happened when I jumped the car. But if that was the case I would get a different error msg.
MBWorld Fanatic!
Joined: Aug 2004
Posts: 1,367
Likes: 3
From: MA
'24 Porsche Macan
Over the weekend my battery went dead as my wife left a light on inside the car. I user her car to jump the E550 however once it was running again I get the "pre safety function limited" error when running the car. The cruise control, pre brake and other features no longer work. I checked the fuses and gave the car a wash as from reading other threads that error generally has to do with dirt on the sensors not a issue with them.
Any one have any idea on what this could be? The only thing I could think of would be something happened when I jumped the car. But if that was the case I would get a different error msg.
Any one have any idea on what this could be? The only thing I could think of would be something happened when I jumped the car. But if that was the case I would get a different error msg.
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
Ya, I let the car run for 10 minutes. Then yesterday I did about 3 hours of driving so it should be fully charged by know. I did see in the book not enough voltage could be a cause for this but figured after all that driving I would be good.
It is the original battery and is 5 years old know. Could it be that after going dead I just can't get the same level of charge back in it?
It is the original battery and is 5 years old know. Could it be that after going dead I just can't get the same level of charge back in it?
MBWorld Fanatic!
Joined: Aug 2004
Posts: 1,367
Likes: 3
From: MA
'24 Porsche Macan
Ya, I let the car run for 10 minutes. Then yesterday I did about 3 hours of driving so it should be fully charged by know. I did see in the book not enough voltage could be a cause for this but figured after all that driving I would be good.
It is the original battery and is 5 years old know. Could it be that after going dead I just can't get the same level of charge back in it?
It is the original battery and is 5 years old know. Could it be that after going dead I just can't get the same level of charge back in it?
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
Do you think by driving it will get the charge back in? Or should I look at buying a battery charger or at least look at getting the battery tested?
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
I'm going to grab a charger on my way home tonight. Do I need to connect the charger directly to the battery in the trunk? Or can I just use the terminals under the hood?
MBWorld Fanatic!
Joined: Aug 2004
Posts: 1,367
Likes: 3
From: MA
'24 Porsche Macan
Don't use a cheap charger. Incorrect charging of a battery could do more harm than good. Check your owner's manual (and/or this forum) for correct charging procedures. I would have the battery and charging system checked by a competent tech.
Last edited by noka; Jan 19, 2015 at 08:52 PM.
Trending Topics
MBWorld Fanatic!
Joined: Oct 2014
Posts: 1,053
Likes: 347
2011 E-350 4Matic Sport
I thought that these cars, like many today, have an auto shut-off for any lighting left on to avoid battery drain? I've noticed that if I'm doing something that involves trunk or doors open the lighting will shut off on its own after a few minutes.
Also, I doubt a 5 yr old battery is worth messing with after such a complete drain, seems these days 3-5 years is average battery life. I'd rather just change it out rather than mess with it and eventually wind up getting stuck somewhere.
An easy way to check charging is to check voltage at the battery terminals while the engine is running - should be about 14 to 14.5v.
Also, I doubt a 5 yr old battery is worth messing with after such a complete drain, seems these days 3-5 years is average battery life. I'd rather just change it out rather than mess with it and eventually wind up getting stuck somewhere.
An easy way to check charging is to check voltage at the battery terminals while the engine is running - should be about 14 to 14.5v.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
Went home last night and got a battery charger, put it on and the battery was low at 25 percent. Took about an hour till the unit said it was fully charged but the sensors still have not come back on.
Agreed I think the battery might just be toast. Going to take it in and have it tested to see what the story is.
Anyone have a suggestion for a good battery to use? Or am I best just getting the OEM one?
Agreed I think the battery might just be toast. Going to take it in and have it tested to see what the story is.
Anyone have a suggestion for a good battery to use? Or am I best just getting the OEM one?
MBWorld Fanatic!
Joined: Oct 2014
Posts: 1,053
Likes: 347
2011 E-350 4Matic Sport
Most batteries are mfg by a only a couple of companies so you're essentially buying by branding.
Be sure to match the battery size and amperage ratings. Going over on the CCA's and rated amperage has never been an issue, it just means more capacity in the battery. By that I mean if the OEM battery was rated at 700 CCA, you can buy one rated at 750 CCA's as an example.
Be warned almost all batteries have increased in price over the last few years, so shop around. I buy based on capacity/warranty/price.
I just bought a new battery for the truck from Walmart, last one for a previous car was from Advance Auto, as mentioned I shop around. Your dealer may be competitive but IMO that may be doubtful lol.
Be sure to match the battery size and amperage ratings. Going over on the CCA's and rated amperage has never been an issue, it just means more capacity in the battery. By that I mean if the OEM battery was rated at 700 CCA, you can buy one rated at 750 CCA's as an example.
Be warned almost all batteries have increased in price over the last few years, so shop around. I buy based on capacity/warranty/price.
I just bought a new battery for the truck from Walmart, last one for a previous car was from Advance Auto, as mentioned I shop around. Your dealer may be competitive but IMO that may be doubtful lol.
MBWorld Fanatic!
Joined: Mar 2014
Posts: 3,107
Likes: 394
From: West Central Florida
2011 E550 P2 4M Sedan
most will say warranty on MB OEM battery is not worth the cost when you get a longer warranty for less from most battery stores. Not sure if AGM is required, but the OEM is AGM in mine and it can run $150-$200 for a replacement.
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Went home last night and got a battery charger, put it on and the battery was low at 25 percent. Took about an hour till the unit said it was fully charged but the sensors still have not come back on.
Agreed I think the battery might just be toast. Going to take it in and have it tested to see what the story is.
Anyone have a suggestion for a good battery to use? Or am I best just getting the OEM one?
Agreed I think the battery might just be toast. Going to take it in and have it tested to see what the story is.
Anyone have a suggestion for a good battery to use? Or am I best just getting the OEM one?
If you choose to go there ask them to read the codes from your car. If the sensors are not working there should be a code for it. Perhaps there is one saying "Low voltage" and ends the guessing game. They read the codes free but are not allowed to reset any by the law.
Super Member
Joined: May 2014
Posts: 620
Likes: 65
From: Florida
2018 E300 Luxury - P3 and more
Depends on the year of the car & how it's equipped. In general: 2014 and newer, pre-safety and cabin run off the aux battery once the aux battery has a sufficient charge, then seems to run off the aux battery until the car is shut off. 2013 and older, pre-safe runs off the main (engine compartment) battery.
MBWorld Fanatic!
Joined: Mar 2014
Posts: 6,397
Likes: 695
From: Northwest Illinois
2014 E350 also restored: 1969 Camaro convertible SS 1957 Chevy Belair 2dr hardtop
Did you check to see if your car had more than one battery. From what I have been told you can have as many as 3 batteries in the car. I may be wrong but I think you should check
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
Depends on the year of the car & how it's equipped. In general: 2014 and newer, pre-safety and cabin run off the aux battery once the aux battery has a sufficient charge, then seems to run off the aux battery until the car is shut off. 2013 and older, pre-safe runs off the main (engine compartment) battery.
When you say main under the hood do you mean trunk. It was my understand the main is in the trunk and the aux is the one under the hood?
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
Ya it has two, i have charger the main and this weekend will hook it up to the aux one to see the condition and look at charging it as well.
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,630
From: North Scottsdale, AZ
'71 Pinto
MY10 e550 has one battery in trunk, and backup battery for transmission electronic gear selector under dash; 4matic one in engine compartment + backup under dash. If you think/know your vehicle has different PM your VIN I will confirm. MY advice, have an independent check the battery and retrieve/clear any fault codes that may be stored with MB DAS. As a matter of reference attached relevant OM pages for membership.
Last edited by konigstiger; Jan 22, 2015 at 02:38 PM.
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
MY10 e550 has one battery in trunk, and backup battery for transmission electronic gear selector under dash; 4matic one in engine compartment + backup under dash. If you think/know your vehicle has different PM your VIN I will confirm. MY advice, have an independent check the battery and retrieve/clear any fault codes that may be stored with MB DAS. As a matter of reference attached relevant OM pages for membership.
Thread Starter
Member
Joined: Dec 2014
Posts: 102
Likes: 1
From: Toronto, ON
2010 E550 4Matic, P1, P2
Okay so to end this in a bit of a funny way. I was driving to curling tonight, yes curling we do that here in The Great White North, i.e. toronto 
...
I was playing with the in dash setting and decided to do a factory re-set just for the sake of trying it. Well wouldn't you know it but that seems to have solved the problem. No more warning messages and all pre-safety functions are back up and running.
I'm still going to have the battery looked at over the weekend just to be safe but knock on wood everything is back up and running.
Thanks for all the advice too all!
...I was playing with the in dash setting and decided to do a factory re-set just for the sake of trying it. Well wouldn't you know it but that seems to have solved the problem. No more warning messages and all pre-safety functions are back up and running.
I'm still going to have the battery looked at over the weekend just to be safe but knock on wood everything is back up and running.
Thanks for all the advice too all!
Super Member
Joined: May 2014
Posts: 620
Likes: 65
From: Florida
2018 E300 Luxury - P3 and more
I believe that the MY10 still has an aux battery underneath the driver's side dash. IIRC it only powers the transmission selector though, nothing else.
Newbie
Joined: Feb 2015
Posts: 1
Likes: 0
B-CL-Class 2014
PRE-SAFE FUNCTIONS LIMITED SEE OPERATOR'S MANUAL
Our Mercedes Benz B-CL-Class have a serious problem since July 2014, When I star the car them 20 min in the middle screen show me as follows: PRE-SAFE functions Limited See Operator's Manual, Inoperative See Operator's Manual, Them the car is slow without power, risking my safety on the highway. I was at the dealer on 08/08/14 for first time and they not found the problem, after that time I have gone 2 times, its the same,. I can't resist this problem one again. What you can do for me? I am disappointed with this car. We appreciate your prompt response. Thank You.
