AAS DEFECTIVE AND AUXILLIARY BATTERY MALFUNCTION
Senior Member
Joined: Jan 2007
Posts: 357
Likes: 5
G63 AMG
Change this battery, and thank me later.
its behind the driver side dash.
http://www.ebay.com/itm/Mercedes-Ben...-/201702075755
its behind the driver side dash.
http://www.ebay.com/itm/Mercedes-Ben...-/201702075755
Newbie
Joined: Jun 2017
Posts: 1
Likes: 0
g55
please till us if it resolved by changing the trans valve body
Junior Member
Joined: Jun 2009
Posts: 16
Likes: 1
From: North Carolina, USA
2010 G55 AMG
Update coming
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Super Member
Joined: Aug 2007
Posts: 623
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From: Boston
CLK63 BS
Junior Member
Joined: Jun 2009
Posts: 16
Likes: 1
From: North Carolina, USA
2010 G55 AMG
It might be Aux battery going bad. Several have reported this was issue with a simple fix.
I was also having bad slippage from 2 to 3rd gear. If I turned off truck, it cleared error and limp mode. However, would return often.
Update here after deal looks at the recall.
I was also having bad slippage from 2 to 3rd gear. If I turned off truck, it cleared error and limp mode. However, would return often.
Update here after deal looks at the recall.
Newbie
Joined: May 2021
Posts: 6
Likes: 0
From: United Kingdom
G63
Auxiliary battery malfunction & AAS defective
Hi, I have a 2015 G63. Since the last 2 weeks I’ve been getting Auxiliary battery malfunction & AAS defective on the dash. I’ve taken it to the Mercedes dealer and they replaced the auxiliary battery. The warnings went away for a few days but then came back. Stop start has stopped working while the warnings are on. Any idea what the problem could be?
Appreciate any help thanks.
Appreciate any help thanks.
Newbie
Joined: Jul 2021
Posts: 1
Likes: 0
2014g63
Hi, I have a 2015 G63. Since the last 2 weeks I’ve been getting Auxiliary battery malfunction & AAS defective on the dash. I’ve taken it to the Mercedes dealer and they replaced the auxiliary battery. The warnings went away for a few days but then came back. Stop start has stopped working while the warnings are on. Any idea what the problem could be?
Appreciate any help thanks.
Appreciate any help thanks.
Newbie
Joined: May 2021
Posts: 6
Likes: 0
From: United Kingdom
G63
Auxiliary battery malfunction & AAS defective
will keep this thread updated.
Newbie
Joined: May 2021
Posts: 6
Likes: 0
From: United Kingdom
G63
Auxiliary battery malfunction and AAS defective
Quick update, yesterday took the car to Mercedes again and they replaced the aux battery for the 3rd time. When i got the car it was fine no warning lights. Driving the car on the motorway (highway) the stop start light was coming on and off. After parking the car for a few hours the AAS defective and auxiliary battery malfunction was back again. I think next I’m going to take it to an independent specialist o sort this issue out. My G63 has got just over 37 thousand miles and has been kept up to date with its services. Will keep this updated so we can help other g class owners.
Last edited by SABE786; Sep 25, 2021 at 11:21 AM.
Newbie
Joined: Oct 2018
Posts: 2
Likes: 1
Mercedes SL550
Help! I have exact same issue…
did you figure out what’s the cause of this? my 2013 G63 is doing the same
Change this battery, and thank me later.
its behind the driver side dash.
http://www.ebay.com/itm/Mercedes-Ben...-/201702075755
its behind the driver side dash.
http://www.ebay.com/itm/Mercedes-Ben...-/201702075755
Newbie
Joined: May 2021
Posts: 6
Likes: 0
From: United Kingdom
G63
Update AAS defective and Aux battery malfunction
Newbie
Joined: Jan 2021
Posts: 3
Likes: 1
w208
Have a 2016 G63 with exactly same issue . Did you find out what was the problem ?
I replaced auxiliary battery but did not worked . Stop and go and brake HOLD do not work and message " auxiliary battery malfuncion is on after start engine . Any input would be greatly apreciated ! Thanks !!
Last edited by Gelson Camargo; Nov 21, 2021 at 09:09 PM.
Member
Joined: Jun 2003
Posts: 128
Likes: 1
From: California
1986 190D 2.5 (W201), 1999 SLK230 (R107), 2000 S500 , 2001 SL500, 2005 G55 Grand edition 327 of 500
Quick update, rebooked my car back into the dealership and they have said that there is something 100% draining the aux battery. They asked me if I have any aftermarket electrical accessories and apart from a valve operated exhaust system there is nothing else (this issue was also happening before I installed the exhaust). So they said that a technician is going to run an investigation to try to find out what is draining the battery hopefully 🤞it should get sorted.
Newbie
Joined: Dec 2021
Posts: 1
Likes: 0
Mercedes g63
MERCEDES G63
Change this battery, and thank me later.
its behind the driver side dash.
http://www.ebay.com/itm/Mercedes-Ben...-/201702075755
its behind the driver side dash.
http://www.ebay.com/itm/Mercedes-Ben...-/201702075755
THANKS
Newbie
Joined: May 2021
Posts: 6
Likes: 0
From: United Kingdom
G63
AAS defective and AUX battery malfunction “update”
Quick update, rebooked my car back into the dealership and they have said that there is something 100% draining the aux battery. They asked me if I have any aftermarket electrical accessories and apart from a valve operated exhaust system there is nothing else (this issue was also happening before I installed the exhaust). So they said that a technician is going to run an investigation to try to find out what is draining the battery hopefully 🤞it should get sorted.
Hi, quick update so far been around 3 months and touch wood so far so good. No lights or warning have showed regarding the battery.
What the dealership did was they replaced the main 12V battery, the aux and a wire.
But I remember before I gave the car to the dealership before it got sorted I put a multi meter on the main 12V battery and it was measuring 12.3V which is quite low (car was not started) usually around 12.6V is healthy.
Also just as a suggestion for anyone else who has this issue try putting your car on a trickle charger (preferably a good quality ctek one). Or you can try Ctek’s stop start trickle charger.
Newbie
Joined: Oct 2018
Posts: 2
Likes: 1
Mercedes SL550
Replaced OE Auxiliary Battery with a iGel battery
I replaced my 2014 G63 OE Auxiliary Battery with a iGel battery. No not error codes and the ECO drive even started working again too.
See attached photo of battery 🔋
ebay better description:
“YTX14-BS Chrome Pro Series High Performance iGel Powersport Battery”
FYI auxiliary battery is located under back seat cup holders underneath main battery.
Dealer told me it was behind the passenger glove box!¿
See attached photo of battery 🔋
ebay better description:
“YTX14-BS Chrome Pro Series High Performance iGel Powersport Battery”
FYI auxiliary battery is located under back seat cup holders underneath main battery.
Dealer told me it was behind the passenger glove box!¿
Newbie
Joined: Nov 2022
Posts: 6
Likes: 1
2013 g550
What wire was replaced please?
Hi, quick update so far been around 3 months and touch wood so far so good. No lights or warning have showed regarding the battery.
What the dealership did was they replaced the main 12V battery, the aux and a wire.
But I remember before I gave the car to the dealership before it got sorted I put a multi meter on the main 12V battery and it was measuring 12.3V which is quite low (car was not started) usually around 12.6V is healthy.
Also just as a suggestion for anyone else who has this issue try putting your car on a trickle charger (preferably a good quality ctek one). Or you can try Ctek’s stop start trickle charger.
What the dealership did was they replaced the main 12V battery, the aux and a wire.
But I remember before I gave the car to the dealership before it got sorted I put a multi meter on the main 12V battery and it was measuring 12.3V which is quite low (car was not started) usually around 12.6V is healthy.
Also just as a suggestion for anyone else who has this issue try putting your car on a trickle charger (preferably a good quality ctek one). Or you can try Ctek’s stop start trickle charger.
Hi, I'm having same problem. We replaced the main and the aux but assuming something is either draining or not charging the aux. Do you know what wire was replaced that fixed this? Also, the trickle charger would be just to avoid the main battery from dying, right? Thanks!
Junior Member
Joined: Jul 2009
Posts: 59
Likes: 30
From: Newport, Rhode Island
2025 G580, 2026 G63, 2011 Chevy Duramax
the Aux battery is under the main battery. They are both located under the cup holders that sit behind the center console in the rear passenger area floor.
MBWorld Fanatic!
Joined: Dec 2003
Posts: 6,279
Likes: 58
From: OC
i drive them all, fast and hard
What does AAS actually stand for in this case
i have both warnings on now.. Is it ok to drive the car until fixed
other thing i noticed is when i switch to Drive, i get a warning " car not in park, may roll" ....Yeah obviously... why would it say that
i have both warnings on now.. Is it ok to drive the car until fixed
other thing i noticed is when i switch to Drive, i get a warning " car not in park, may roll" ....Yeah obviously... why would it say that
