Mercedes Benz

  Older Tesla Model S units (particularly those from 2012–2020) are known for "electrical gremlins" that can range from minor annoyances to leaving the car immobile. Here are 5 labels for these common electrical issues: MCU1 eMMC Memory Failure, Cause: The original Media Control Unit (MCU1) used a 8GB eMMC memory chip that had a finite number of "write" cycles. Once the memory was full of logs and cached data, the chip would wear out and fail. Solution: A major Tesla recall (2021–2026) provides a free upgrade to a 64GB memory chip. Many owners opt for the paid "MCU2" upgrade ($1,500 approx.) to get a faster processor and modern features like Netflix and YouTube. 12V Battery "Deep Sleep" Failure, Cause: Unlike the main high-voltage battery, the 12V lead-acid battery powers the computers and locks. 1 If it fails, the car cannot engage the high-voltage contactors to start or even open the doors. Solution: Tesla mobile service replaces the 12V b...