Why do I get fault code 7781 after battery replacement?
Possible just an old fault left over with the old battery or because the battery has not been coded into the car and the car still thinks it’s using the old battery. pretty sure once coded in, the fault will clear. 7781 I think relates to a low voltage, so perhaps when the old battery was still in use the fault code was stored.
Why is there no fault code after battery replacement?
Possible just an old fault left over with the old battery or because the battery has not been coded into the car and the car still thinks it’s using the old battery. pretty sure once coded in, the fault will clear. Click to expand… Cheer mate. I had a look at it last night and have tried multiple combinations but nothing worked.
Can you confirm new battery, is coding required?
There is conflicting information, some people saying yes, and other information stating the car eventually learns a new battery has been fitted. Can anyone confirm the car will eventually learn the new battery? I know the official line is coding is needed, but is It really? Rodders. Crazy price from Audi!!!
Do you need BEM code for new battery?
Which I think means you need a battery with a BEM code and needs to be coded , or I guess you could buy the same rating battery without a code and reuse your code from the old battery ? Just a though – If you don’t know anyone who can code for you you could check out RAC website and see how much they will charge.
There is conflicting information, some people saying yes, and other information stating the car eventually learns a new battery has been fitted. Can anyone confirm the car will eventually learn the new battery? I know the official line is coding is needed, but is It really? Rodders. Crazy price from Audi!!!
Do you need to initialize an ECU after reconnecting the battery?
In some cases, this may also occur if the battery voltage becomes low or if the battery is recharged. After the battery is reconnected, these systems must be initialized before they can work properly. An ECU also typically requires initialization after the ECU or a component it controls has been removed or replaced. Customized Settings
Which I think means you need a battery with a BEM code and needs to be coded , or I guess you could buy the same rating battery without a code and reuse your code from the old battery ? Just a though – If you don’t know anyone who can code for you you could check out RAC website and see how much they will charge.
What happens to ECUs when the battery is disconnected?
When the vehicle’s battery is disconnected, some ECUs will lose information stored in their memory. In some cases, this may also occur if the battery voltage becomes low or if the battery is recharged. After the battery is reconnected, these systems must be initialized before they can work properly.