Mercedes 9G-Tronic (725.0) Transmission Control Module (TCM) Repair
P073E00 | P07B700
The Mercedes 9G-Tronic (725.0) Transmission Control Module (TCM) is a common point of failure across a wide range of Mercedes-Benz vehicles. Internal faults often trigger diagnostic trouble codes such as P07B700 – Pressure sensor signal invalid and P073E00 – Reverse gear does not engage. These issues are typically caused by electronic degradation or sensor malfunction within the TCM, often due to excessive heat or wear over time.
When the TCM begins to fail, it can severely affect the performance and safety of the vehicle. Drivers may experience loss of reverse or forward gears, gearbox stuck in limp mode, jerky or delayed gear changes, and warning lights on the instrument cluster. In many cases, the vehicle may become undrivable or unpredictable, especially once the fault progresses beyond an intermittent issue.
At VCUS, we fully rebuild your original TCM using uprated, thermally robust components that far exceed the original specification, significantly improving reliability. Unlike the main dealer, who will replace your unit with new hardware that still contains the same known weak points, we proactively address and eliminate the root cause of failure. Every repair is thoroughly tested under real-world conditions, backed by our unlimited mileage lifetime warranty, and includes a comprehensive repair report. With fast turnaround times and expert support, VCUS is the trusted alternative to dealer replacements and generic remanufacturing services.
Common Fault Codes
P073E00 - Reverse Gear Does Not Engage
P07B700 - Pressure Sensor Signal Invalid
Common Symptoms
Loss Of Forward Gears
Loss Of Reverse Gear
Gearbox In Limp Mode
Warning Lights Displayed
Affected Vehicle Models
C-Class 2015 - 2021
E-Class 2016 - 2023
S-Class 2013 - 2020
Vito 2019 onwards
V-Class 2019 onwards
GLE Class 2011 - 2019
M-Class 2011 - 2019#
SLK 2011 - 2020
SLC 2011 - 2020
Frequently Asked Questions
Yes. VCUS repairs your original TCM by addressing the underlying hardware failure. We rebuild the unit using uprated components that are more durable than those used in brand-new dealer replacements, helping to prevent repeat failure and eliminating the need for reprogramming.
No. Because we repair your original unit, it remains coded to your vehicle. There’s no need for dealer-level programming or adaptation, making installation as simple as plug-and-play in most cases.
We offer flexible turnaround options to suit your schedule:
Same-Day Drop-Off & Collection – Available by appointment only. Perfect for local customers who need the fastest possible turnaround. This service adds 40% to the standard repair cost.
Express Service (1–2 Working Days) – Prioritised repair for urgent cases, adding 25% to the standard repair cost.
Standard Service (Up to 3 Working Days) – Our typical turnaround time once your module is received, with no additional cost.
All options include a full diagnostic inspection, rebuild using uprated components, rigorous bench testing, and a detailed repair report. We also offer free insured collection of your control module from anywhere in the UK.
Every TCM repair by VCUS includes an unlimited mileage lifetime warranty. This reflects our confidence in the upgraded components and stringent testing process we apply to every repair.
Getting your 9G-Tronic TCM repaired with VCUS is simple and fully managed:
Fill out a Test Form or call us – Start by submitting our online Test Form or calling our team. This allows us to log your unit and fault details before collection.
We arrange free insured collection – We’ll book a courier to collect your control module from anywhere in the UK at no cost to you.
Initial diagnostic testing – Once your unit arrives, it undergoes thorough bench testing to confirm the fault.
Complete rebuild using uprated components – We repair the known failure points using thermally robust, upgraded components for improved longevity.
Final testing and quality assurance – The unit is retested under load to ensure it performs flawlessly.
Next-day tracked return delivery – We dispatch your rebuilt TCM via next-working-day courier, including a detailed repair report and our unlimited mileage lifetime warranty.
No coding or adaptation is needed — just reinstall the original unit and your vehicle will be ready to drive.
Quick Links
Automotive Solutions
Vehicle Control Unit Solutions Limited.
Limited Company Number: 15019362