orogunmoku

I WOKE UP TO SEE THE ABOVE ERROR MESSAGE O MY 2014 G 63 THIS MORNING
WHAT DOES IT AND HOW DO I GET RID OF IT

BENSON

aznevoviii

Change this battery, and thank me later.

its behind the driver side dash.

http://www.ebay.com/itm/Mercedes-Ben...-/201702075755

DavidTree

Resolved?

I am getting just AAS service required with transmission slip in 1st and 2nd gear.

Trans valve body is suspected issue per my MB repair shop.

Ahmed Bin Saqer

i have the same problem.. unfortunately when i send it.. to our local dealer the error is gone last week and today it showed in my dash ..
please till us if it resolved by changing the trans valve body

DavidTree

They should be able to see if any codes are getting recorded.
I had the following:

P0730
P0731
P2784
P0732

DavidTree

Trans valve body was not the issue and was not replaced.

The issue was the Transmission Module - Control Plate. No issues after replacing it.

fatmike

Just got this light today on my 15

DavidTree

Are you having auto transmission slipping when changing gears?

fatmike

Not that I noticed. Turning the truck off and on didn't help either.

After a 20 min highway drive, the light didn't come back on next startup.

Going to the dealer on Monday anyway for the steering recall.

DavidTree

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.

Kwesi400

I cant find mine behind my dash. It’s a 2013 G63

SABE786

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.

Mattewagon

I have the same issue on my 2014g63 i replaced aux battery 2 times still nothing. Did you figure out what the issue was?

SABE786

Took the car back to the main dealers, this being the 3rd time. They kept it for a day and claimed they replaced a wire which they had to order from Germany and took 2 months to arrive. For 2 days the AAS defective warning light went off and there was no auxiliary battery malfunction warning light. The stop start was still not active and now after a quick drive both of the warning lights are back on. I’m guessing I’m going to have to take my G63 to the dealers again…..
will keep this thread updated.

SABE786

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.

i2cv@me.com

did you figure out what’s the cause of this? my 2013 G63 is doing the same

SABE786

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.

Gelson Camargo

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 !!

SUHAIL

that’s what I like older cars, not too many electronic components to drain anything, my 1986 190D 2.5 can sit for more than a month, it starts right up. My others, a 2000 S500, a 2005 G55, and a 2001 SL 500 all complain if not driven at least a couple of times a month.

Ryhn

YOU SAID BEHIND THE DRIVER SIDE DASH CAN YOU PLEASE TELL ME THE EXACT LOCATION OF THE BATTERY AND HOW CAN I GET TO THE BATTERY.
THANKS

SABE786

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.

i2cv@me.com

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!¿

Kwmbaz

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!

Trayder

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.

vdubpower

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