Correctly Programming Batteries in VAG vehicles
VAG is generally referred to as Volkswagen Auto Group. The Group comprises twelve brands from seven European countries: Volkswagen Passenger Cars, Audi, SEAT, ŠKODA, Bentley, Bugatti, Lamborghini, Porsche, Ducati.
When replacing a battery in any of these vehicles, a BEM (Battery Energy Management) code is required to register the battery in order to have the correct charging profile. This ensures the new battery is correctly calibrated to the vehicle electronics.
Wet lead and AGM need different charging profiles, and using the wrong profile will lead to an early battery death. AGM batteries can last 8+ years with proper charging.
It is important to note that the VAG OE specific BEM code is NOT the same as the VARTA BEM code and most diagnostic tools are calibrated to the OE BEM code only.
To overcome this, the new battery can be registered using the code labelled on the old battery with the following changes:
- Keep the battery specific OE number in the first row the same.
- Change one digit in the second row between the 4th to 13th position.
- Recommend incrementing the 5th digit (year of manufacture)
Proper programming will ensure your battery lasts longer and vehicle sensor systems operate correctly to maintain driving quality.
The old battery should be retained to copy the codes when a replacement is performed.
Always replace like-for-like.
AGM (Absorbed Glass Matt) must be replaced with AGM
EFB (Enhanced Flooded Battery) can be replaced by AGM
AGM cannot be replaced with EFB.