2003 Mercedes-Benz E500 P0730 Code Persists After Transmission Repair and Engine Mount Replacement

Hello, I recently encountered a persistent transmission issue on my 2003 Mercedes-Benz E500 (approximately 152,000 km). The vehicle began exhibiting intermittent jerking when stopped at traffic lights or stop signs, along with delayed acceleration upon pedal depression. Initially, a mechanic suggested replacing the worn engine mounts to resolve the shaking sensation. After installation and road testing, the problem persisted, prompting an inspection by a transmission specialist. The issue was diagnosed as requiring transmission repairs, including replacement of the conductor plate and torque converter—costing over $4,000 in total. Despite clearing the fault codes and driving under various conditions, the P0730 code continues to appear. I have since consulted two separate transmission mechanics who both stated that the P0730 code is not directly related to the work performed. However, the symptoms—intermittent jerking and sluggish acceleration—are concerning. Could anyone provide insight or suggestions on possible causes of this fault? The P0730 code typically indicates issues such as: - Low or contaminated transmission fluid - Worn pump or clogged fluid filter - Faulty torque converter clutch, solenoid, or internal blockage - Mechanical failure within the transmission - Internal blockage in the main control valve - Defective shift solenoids or wiring - Faulty transmission control module I am seeking advice on how to properly diagnose and resolve this issue. Any experience with similar cases on 2003 Mercedes E500s would be greatly appreciated. Thanks in advance!