⚙️ Mercedes A-Class Transmission Control Module (TCM) Repair – P/N: A 168 540 00 44

⚙️ Mercedes A-Class Transmission Control Module (TCM) Repair – P/N: A 168 540 00 44

Selector Fault | Internal TCU Error Code 200A

This is a repair service for the transmission control unit (TCU) / gear selector module found in the Mercedes-Benz A-Class, part number A 168 540 00 44 / 7 D 88. These units often fail due to internal electronic faults, commonly showing fault code 200A – “Internal fault in control unit.”

Common Symptoms Repaired:

• Gear selector not responding

• Transmission stuck in park or limp mode

• Fault code 200A: Internal fault in control unit

• Dash warnings for transmission or gear selection

• No communication with TCU via diagnostics

What We Do:

• Disassemble and inspect the internal control circuitry

• Repair or replace faulty components causing the internal error

• Reflow or rebuild key communication and power tracks

• Bench test the selector function and CAN communication

Applies To:

• Mercedes A-Class (W168 and similar platforms using P/N A 168 540 00 44)

• TCU with markings 7 D 88, selector-type mounted

Turnaround Time: 2–4 business days
Warranty: 12 months on repaired components

💡 Save time and cost by repairing your original selector module — no need for reprogramming or key matching.