Recoding when installing new auxiliary battery

[Claire Fletcher]

I am constantly disappointed that service centres and roadside assist dont know this. And because I am a female 69 yrs I get gaslighted on it. Like it doesn't exist and I am making it up. I hjad it from MG when a new battery is installed there is a redoing to be done. Help does anyone have actually procedure notes please

 

[Jto]

If the 12v battery should just a straight swap then run the car and alarms should go away. There’s no recoding to do.

 

[Claire Fletcher]

If the 12v battery should just a straight swap then run the car and alarms should go away. There’s no recoding to do.

I get mixed messages. After the RACQ Roadside Assist installed the 12v battery the EV battery would not charge

I took my car to the MG specialist and they said DO NOT drive the car it is very dangerous. They kept my car for 5 days and charged me 600.00.

I was then told it needs recoding after a new 12v is installed and that RACQ should have known that.

I then spoke to the MG Roadside Assist and they told me that when a 12v battery or maybe a totally flat battery in changed recoding is needed.

May I ask your experience in the issue please.

 

[Jto]

I helped many people with the same problem, I have never known a battery on any car need to be coded to the car parts yes.
I can not open your attachments on my phone but will try on my pad later.
From what you say the battery after replacement would not charge.
EV type cars do not have alternator like on ICE cars so charge from the high voltage battery through a box that steps down the voltage to 12v to charge the 12v battery.
If this has been replaced the 12v should be charging and car check this on one of the dash screen. When car is in standby it will read 12v and when the car is in ready mode will read over 13v.

Do you do a lot of short journeys?
Do you charge the high voltage battery to run on electric.

 

[Jto]

You not said what model of MG you got.

 

[MG Clive]

Fitting a new battery will be just like disconnecting and reconnecting an existing battery, and there are many repairs / procedures in the Owner's Manual which begin with 'Disconnect the negative battery cable', and end with 'Connect the negative battery cable', but it never mentions anything about re-coding it.

 

[JohnV6]

On the ZS you don't need to recode. All 3 of our cars don't need recoding. Neither from memory do they lose settings like radio stations

 

[Jto]

I get mixed messages. After the RACQ Roadside Assist installed the 12v battery the EV battery would not charge

I took my car to the MG specialist and they said DO NOT drive the car it is very dangerous. They kept my car for 5 days and charged me 600.00.

I was then told it needs recoding after a new 12v is installed and that RACQ should have known that.

I then spoke to the MG Roadside Assist and they told me that when a 12v battery or maybe a totally flat battery in changed recoding is needed.

May I ask your experience in the issue please.

Hi
Now had a look at the garage report it was not a battery that need to be recoded but the on board charger ( OBC) that needed recoded, it could not see the battery and would not charge the battery. There could be a problem with the OBC which could be intermittent but if this need to be replaced it will come under the 7 year warranty.

The road side assistance I would not expect them to see this they did bus reset and got the car going, the garage found the new battery was not charging because the fault with the OBC unit, why the relay had a short to ground need to investigate, one thing this should have been covered by warranty to me, I hope you understand my explanation of the above.


No one is pull the wool over your eyes , one thing you can ask there was a recall of some of these cars over a earth cable needed attention that some carpet had but stuck under the earth point. There only some car had a recall not all.