When an Audi experiences a significant accident or the voltage of its Mild Hybrid 48V lithium battery drops too low, the battery enters a protective mode and becomes unchargeable. As a result, the vehicle fails to initiate, and replacing the battery becomes a costly endeavor. You may need spend $4,000 for 48v battery replacement.
Common error codes: P0A7D00, P0A8000, P0B2900
Module: Battery lithium module
Models: Audi A7, A8, Q7, Q8 and other MHEV models after 2018
Part number: 4N0 915105B
MCU: SPC5644BMLU8(0N32E)
Here is a solution to unlock a 48v battery after discharge.
Audi 48V battery repair solution:
1: Remove the battery shell and find the corresponding MCU. We remove the circuit board and find mcu chip 5644B.
2: Use programmers to write virgin data into MCU.
3: Use special charger to charge the battery to 48V.
4: Install the battery shell, use the Audi 48V test platform to test whether there is 48V voltage output
5: Load the battery, use ODIS to activate the battery, the vehicle can start normally. In ODIS diagnosis go to guided functions and close the charging contractor. hook up a 100 amp charge to the 12v battery, so it can charge the 48v battery. 48v battery has to be above 5% charge level. Below that you need to replace the battery. You could charge it, but you will need special tools.
You can read this mcu data from original battery module, modify the data, then write the virgin data back to the battery module.
CG100X, Xhorse Multi Prog will read and write Audi 48V battery module. But they cannot virgin data or repair module directly.
SMOK can do everything by its own, but have to pay for a license.
In CG100X software, go to Programmer->Motorola->MPC56XX->MPC5644B, check wiring diagram.
In Xhorse Multi prog software, select Audi A8-48V lithium battery (MPC5644B) option and check wiring diagram.
Read also:
Repair Porsche Cayenne 12V Lithium Battery by CG100, ACDP, X431, Xtool or VVDI?
How to Repair Mercedes Benz 48V Mild Hybrid Battery with CG100?