Mercedes-Benz TCU & ECU Cloning, Module Virginising & Xentry Online Coding

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What we do — Full scope of Mercedes module services

TCU / Gearbox Control Module (VGS / NAG) cloning & programming — replacement module programming and data transfer for FBS3 & FBS4 protected vehicles (including 7G VGS3, 7G VGS4-0-NAG2, VGS4-500-NAG2, 9G VGS-NAG3, FDCT).
ECU cloning — engine ECU transfers or returning modules to a virgin (blank) state for safe installation.
ISM / DSM module Cloning or Virgin — Setting a used module to a virgin state which can be installed on the car and programmed or we can clone the data over from original to used one.
Instrument cluster programming & coding — cluster replacements, mileage preservation, and instrument cluster scn coding.
Online Xentry coding & SCN / software updates — factory-level SCN coding and online updates using the official Mercedes systems (Xentry), including software updates and feature activation where permitted.

Mercedes-Benz Fault Code P051300 – “The Start Enable Was Not Issued”

If your Mercedes displays fault code P051300, it means the engine start authorization (start enable) was not successfully issued — commonly occurring in vehicles with FDCT (Front-wheel Dual Clutch Transmission) systems.
This fault typically prevents the vehicle from starting or selecting gears and can point to communication, immobiliser (FBS) or gearbox module issues.

We specialise in diagnosing and repairing Mercedes FDCT “Start Enable Not Issued” faults, restoring proper communication between the engine ECU, gearbox control unit (TCU), and immobiliser system (FBS3 / FBS4).

Models commonly affected

Mercedes A-Class (W176, W177)
Mercedes B-Class (W246, W247)
Mercedes CLA / CLA Shooting Brake (C117, C118)
Mercedes GLA (X156, H247)
Other models equipped with the FDCT 7-speed transmission

What Causes Mercedes Fault P051300?

Unlike generic gearbox faults, P051300 is not caused by mechanical failure — it’s an electronic data integrity issue inside the FDCT TCU.

Primary Cause:

Battery voltage drop or disconnection (jump-starts, weak batteries, or long-term storage)
→ This can corrupt EEPROM or flash memory in the TCU, damaging stored start enable and configuration data.

Other Contributing Factors:

Faulty or old battery (low voltage on ignition)
Poor ground connections or power supply instability
ECU or TCU communication interrupted during start-up
Incorrect jump-start procedures
Software mismatch after module replacement