Hello Guys.. 

 

I am gonna change my var battery tomorrow. I wanna to ask do I gonna do Any code or can i change the var battery without Any problem. The old car battery was moll but I have buyed a varta Battery with start stop. I Hope u Guys can help me. 

If you car is start and stop then it will need coding.

I thin it depends if you change the battery type. 

When I went from EFB to AGM, I had to recode the battery type. 

If you stay on the same type, you should be good to go. 

 

2 hours ago, nickytheshaft said:

I thin it depends if you change the battery type. 

When I went from EFB to AGM, I had to recode the battery type. 

If you stay on the same type, you should be good to go. 

 

Even with a battery of the same type and capacity, you SHOULD change the battery serial number so the BMS knows a new battery is fitted and immediately does a recalibration - if you don't do this the BMS will assume the old battery is still fitted and some power saving measures (turning off some loads because it thinks the battery is weak) can still happen for some time.

I changed my Moll EFB type , to a Varta AGM and it did need coding yes.

The BCM needs to have one digit of the "serial number" coding line altered to tell the BCM that a new battery has been fitted & to forget all the old learnt values.

 

If the battery is a different Ah or construction it also needs the respective coding lines in the BCM altered also..

 

I did a big thread on this nearly 7yrs ago....all info for MQB platform cars in first post:-

 

(1) How to retro-fit a bigger capacity battery to a Mk7 Golf | GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum

 

Quote:-

VCDS coding required
From the Main screen:-
Select Control Module [Select]
[19-CAN Gateway]
Advanced Functions screen:-
[Adaptions-10]
New value choice screen:-
Change the following four channels, inputting the relevant data about the new battery.
IDE03256-MAS06105-Battery adaptation-Rated battery capacity
IDE03256-MAS06106-Battery adaptation-Battery technology
IDE03256-MAS06107-Battery adaptation-Battery manufacturer
IDE03256-MAS06108-Battery adaptation-Battery Serial Number

When you click on "Battery technology" (using VCDS 21.3.0) a drop down list appears with the following options (= actual meaning):-
Wet = Standard Lead Acid
Fleece = Standard A.G.M.
Wickel6V
Wickel12V
Ultracap
Gel = Standard Gel Lead Acid
Lithium ions = Standard LiFePO4
EFB = Standard E.F.B.
Binary - AGM = "Bipolar" A.G.M. type
EFB+ = E.F.B. "Plus" type
Not_assigned_10
Not_assigned_11
Not_assigned_12
Not_assigned_13
Not_assigned_14
Unknown

According to various sources of information, including numerous car scans & threads on Ross-Tech, "Fleece" is for standard AGM batteries, "EFB" is for standard EFB batteries, & "Wet" is for standard lead acid batteries, as these settings are used at the factory. The setting of "Binary - AGM" is apparently for specialist "Bipolar AGM" batteries! Also the drop down list is from VCDS & not generated by your car's BCM, therefore, your car may not support all the options on the list, & the BCM will reject the value when you tell it to accept it!

Battery BEM codes are now redundant with the above separate channels. The most important channels are:- Rated battery capacity, Battery technology, & Battery Serial Number. For the Battery Serial Number, just change one digit of the old one. This channel tells the BCM that a new battery has been installed & to relearn the new battery & forget any “learnt values” for the old battery!

Edited 29 December, 20214 yr by fabdavrav