The 722.9 Transmission Control Module (TCM), commonly referred to as the conductor plate, is integral to the Mercedes-Benz 7G-Tronic (722.9) automatic transmission system. This sophisticated component oversees gear selection, shift timing, and overall transmission behavior, contributing to a smooth and efficient driving experience.

Over time, the TCM may develop faults that can significantly impact vehicle performance. Common symptoms of a failing TCM include:​

• Erratic or Harsh Gear Changes: Unpredictable shifting patterns or abrupt gear engagements.
• Delayed Shifting: Noticeable lag when transitioning between gears.
• Transmission Entering Limp Mode: The vehicle becomes restricted to a single gear to prevent further damage.​
• Stuck in Gear: Inability to shift out of a particular gear.

Commont fault codes:

• 0722 - speed signal  from the structural unit Y3 / 9b5 is not available
• 0793 - speed signal from the structural unit Y3 / 9b4 is not available
• 0793 - the gear ratio in a continuously variable automatic gearbox is unacceptable

These issues often stem from internal failures within the TCM, such as defective speed sensors or solenoid malfunctions. Addressing these problems promptly is crucial to maintain the transmission's health and prevent more extensive damage.

Euro Car Electronics specializes in the replacement of faulty 722.9 TCMs. Our services ensure that your vehicle's transmission system is restored to optimal functionality, enhancing both performance and reliability.