I purchased a 2012 Mercedes E350. The battery is OK (checked), I replaced the starter relay, all fuses are OK. I have a OBD II tester. I have 2 DTC codes
U10388 Diagnostic CAN communication has a malfunction. Bus off.
U11600 A Bus keepawake unit was detected.
All electronics in the car work. It was a flood damage car. Under the carpet looks fine.