Volkswagen Power: PR-Codes and Battery Scaling

Volkswagen vehicles use specific "PR-Codes" located on the build sticker (usually in the trunk) to identify the battery tray size. Codes like J0R or J0L dictate whether you need a 70Ah EFB or an 80Ah AGM unit.

Factory Standards

Installing the wrong capacity unit in a VW will trigger an "Energy Management Active" fault, potentially deactivating comfort electronics to save current for the ECU.