Mercedes-Benz Navigation A2129006726 NTG4.5 NTG4.7 Repair Service 1YEAR WARRANTY

Professional Repair for Your Existing Mercedes-Benz COMAND Unit | 1-Year Warranty Included

Is your Mercedes-Benz navigation system malfunctioning or completely unresponsive? You're in the right place. This listing is for a REPAIR SERVICE of your existing Mercedes-Benz NTG4.5 or NTG4.7 head unit — not a replacement.

At Module Medics, we specialize in restoring factory navigation units to full working condition using advanced diagnostic tools and OEM-grade components. Our experienced technicians are equipped to repair all common and advanced failures found in Mercedes-Benz COMAND units.

✅ Common Symptoms of a Faulty NTG4.5 / NTG4.7 COMAND Head Unit:

Owners often experience one or more of the following issues:

• Constant rebooting or random system restarts

• COMAND stuck on the Mercedes-Benz logo (boot loop)

• Complete power failure — unit not turning on

• Radio/nav system draining the car battery

• Unit will not accept reprogramming or coding attempts

• Buttons or control knobs not responding

• Navigation system not functioning or unavailable

• Bluetooth, media interface, or voice control malfunction

These issues can lead to a degraded driving experience, inability to use key vehicle features, and even electrical issues in other modules if left unaddressed.

⚠️ Known Part Numbers:

• A2129006726

• Also applicable to A1729001304, and other NTG4.5 / NTG4.7 units.

If your part number is not listed here, please contact us before ordering. We can verify compatibility for many similar head units.

🛠️ What Vehicles Are Affected?

This type of COMAND system is commonly installed in the following Mercedes-Benz models equipped with NTG4.5 or NTG4.7 platforms:

• Mercedes-Benz E-Class (W212)

• Mercedes-Benz C-Class (W204)

• Mercedes-Benz GLK-Class (X204)

• Mercedes-Benz SLK/SLC-Class (R172)

• Mercedes-Benz CLS-Class (W218)

• Mercedes-Benz ML/GL-Class (W166/X166)

• Other vehicles from model years 2011–2015 with NTG4.5/NTG4.7

If you’re unsure whether your vehicle uses one of these units, reach out with your VIN or part number for confirmation.

🧰 Technical Background:

The NTG4.5/4.7 COMAND systems are advanced infotainment head units that control a wide range of functions, including navigation, radio, Bluetooth, voice control, and vehicle settings. Failures are typically caused by:

• eMMC storage degradation (causing boot loops or software corruption)

• Power regulation circuit failure

• CAN bus communication errors

• Internal short circuits or component breakdowns due to overheating or voltage spikes

These are NOT plug-and-play modules. Replacing them often requires SCN coding or dealer-level programming. That’s why repairing your original unit is the smartest, most cost-effective solution.

🔄 How the Repair Service Works:

1. Buy the repair service on this page.

2. We’ll email you shipping instructions.

3. Ship your faulty NTG4.5 or NTG4.7 head unit to our repair facility in Maryland.

4. Our technicians will diagnose, repair, and test your unit thoroughly.

5. We return the fully repaired unit back to you using insured shipping.

⏱️ Typical turnaround time: 2–3 weeks from the day we receive your unit. Some complex cases may take slightly longer depending on part availability or severity of damage. You’ll be kept updated throughout the process.

✅ Why Choose Module Medics?

• Over a decade of experience in Mercedes-Benz electronics

• Precision diagnostics with dealer-grade tools

• Component-level repair — no unnecessary replacements

• 1-Year Warranty included for peace of mind

• Located in the USA — fast shipping and local support

📌 Important Notes:

• This is a repair service for your existing unit.

• You are not purchasing a replacement or new unit.

• Carefully package your unit to prevent shipping damage.

• Do not send accessories like bezels, screens, cables, or brackets — head unit only.