Mercedes 7G-Tronic (722.9) VGS1, VGS2 & VGS3 Transmission Control Module Repair
Mercedes 7G-Tronic Conductor Plate
Common 7G-Tronic (722.9) TCM / Conductor Plate Faults
Mercedes vehicles fitted with the 7G-Tronic automatic transmission (722.9 gearbox) commonly experience issues caused by internal faults within the TCM conductor plate.
A failing TCM can cause the gearbox to hold gears too long, then shift harshly or jerk between gears, often starting intermittently before becoming permanent over time.
This failure occurs when the internal speed sensors within the conductor plate degrade or lose signal, preventing the module from correctly reading the input shaft speed. As a result, the system can’t calculate torque converter slip or control clutch lock-up effectively — leading to rough gear changes, loss of drive, or complete failure to select gears.
If your Mercedes 7G-Tronic (722.9) gearbox has stored fault codes such as 0717, 0718, 2201, 0721, or 0722, this indicates internal speed sensor faults within the TCM / conductor plate assembly. These issues often lead to gear selection problems, limp mode, or complete loss of drive.
Common Symptoms and Fault Codes
Faults within the Mercedes 7G-Tronic (722.9) Transmission Control Module (TCM) — also known as the VGS / conductor plate — are most often caused by internal speed sensor failures. These sensors, labelled Y3/8N1 (turbine speed sensor) and Y3/8N2 (internal RPM sensor), are responsible for monitoring input and internal shaft speeds so the TCM can determine torque converter slip and manage gear changes accurately.
When one or more of these sensors begin to fail, the TCM can no longer calculate gearbox speeds correctly. This leads to irregular shifting and the common “limp-home” condition where the gearbox locks in a single gear to protect itself.
Typical Symptoms
Delayed or harsh gear changes
Transmission staying in one gear or entering limp mode
Loss of drive or failure to select gears
Intermittent gear shifting that worsens as the fault develops
Jerky or uneven acceleration due to incorrect torque converter control
Frequent Fault Codes
The following diagnostic trouble codes (DTCs) are commonly recorded when internal speed sensors malfunction:
0717 – Signal from component Y3/8N1 (turbine speed sensor) not available
0718 – Component Y3/8N1 (turbine speed sensor) defective
2201 – Component Y3/8N2 (internal speed sensor) defective
0722 – Output speed sensor Y3/8N3 signal not available
0721 – Output speed signal implausible when compared to wheel-speed data
These codes indicate that the internal RPM and speed sensors within the VGS module are no longer providing valid readings, preventing the system from controlling shift timing and clutch operation effectively.
In Summary
If your Mercedes 7G-Tronic (722.9) gearbox displays these symptoms or fault codes, the issue lies within the conductor plate’s internal speed sensors (Y3/8N1, Y3/8N2, Y3/8N3) — not the mechanical gearbox. The VCUS professional repair service is what you need to fully restore sensor function and get your transmission operating smoothly again — without the high cost of gearbox replacement.
Common Failing Part Numbers
A0335457332
A0034460310
A0335456732
A0009013000
A0009013200
A0009017100
VCUS - The Process
Testing and Rebuild Process
At VCUS, every Mercedes 7G-Tronic (722.9) Transmission Control Module (TCM) is rigorously bench-tested to confirm the fault before any repair work begins. Once the issue is replicated on our test bench, the module is carefully dismantled by our skilled technicians for detailed root cause analysis.
Any failed or degraded internal components are replaced with high-quality, uprated parts designed to improve long-term reliability. After reassembly, the TCM undergoes a full retest to ensure the fault has been permanently resolved. The repaired unit is then ready to be refitted to the vehicle — no programming or coding required, unlike many competitor solutions.
Every repair performed by VCUS comes with an unlimited mileage lifetime warranty, and this includes the 722.9 VGS 1, VGS 2, and VGS 3 Transmission Control Modules.
Simple Steps to Repair Your Mercedes 7G-Tronic (722.9) TCM
1. Remove Your TCM
Carefully remove the Transmission Control Module from your gearbox (also known as the VGS unit).
2. Fill Out Our Test Form
Complete our online test form to arrange a free-of-charge collection, or you can post it directly to us at the following address:
VCUS
Vehicle Control Unit Solutions
27 St Michaels Square
Bramcote, Nottingham
NG9 3HG
Please ensure the module is securely packed in a suitably sized box with protective packaging to prevent damage during transit.
3. Testing and Repair
Once received, your TCM undergoes comprehensive bench testing to confirm the fault. After repair, you’ll receive a detailed test report, lifetime warranty, and invoice via email. (Payment is only required once the repair is complete.)
4. Return Delivery
Your repaired TCM will be shipped back via Next Day Delivery, fully insured and tracked.
5. Reinstall the Repaired TCM
Simply reinstall the module back into your vehicle — no programming or coding required. Your original configuration is retained, so the unit is ready to operate immediately.
Choose VCUS for Reliable 7G-Tronic (722.9) TCM Repairs
VCUS provides a professional, hassle-free repair service designed to save you time and money while ensuring long-term reliability. Let us restore your Mercedes 7G-Tronic TCM to peak condition and get you back on the road without the high cost of dealer replacement.
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Limited Company Number: 15019362
VAT Number: 496 4113 72