Porsche Diagnosing And Fixing Battery Discharge Issue

General guidelines:

• Measure battery current (available in CAN-BUS gateway) live data when car is locked. The current should drop to low value no later than 5 minutes after locking the vehicle
• Check all fault codes in ECUs and try to resolve as many as possible, leaving only irrelevant DTCs
• Use coding in CAN-BUS gateway to discover if there are any ECUs that do not go into sleep mode (coding also displays measured consumption)
• Check CAN-BUS Gateway live data to see which ECUs remain active after locking
• Run autoscan with ignition OFF (PoCOM will display warning about ignition OFF) to see which ECUs respond (only gateway should be reachable)
• You can try "ECU restart" coding in ECU that does not go to sleep mode; in some cases it is possible that ECU remains stock in some unexpected state, this may be a temporary solution to prevent battery draining until the issue is fixed

Coverage in PoCOM