Mercedes 7G-Tronic 722.9 TCU Repair – Conductor Plate VGS2 / VGS3
Assessment fee deducted from an approved repair. Repair is not included in the assessment price.
Feedback from garages and vehicle owners
Professional repair, testing and return.
What you are buying: bench repair of your own Mercedes-Benz 7G-Tronic 722.9 transmission control unit (conductor plate, VGS2 / VGS3). Your original unit is tested, repaired and returned, so its software, coding and data stay matched to the car – no programming needed.
12-month warranty · Tracked UK return included · No VAT added · Written test report with every unit · Not faulty? You only pay the £45 test
Typical symptoms
- Gearbox in limp mode, stuck in 2nd or 3rd gear
- No gear changes, harsh, jerky or delayed shifts
- No response when selecting D or R, or loss of drive
- Flashing gear indicator or gearbox fault message on the cluster
- Fault returns after clearing, often when the gearbox is warm
Fault codes seen on these units
| Code | Meaning |
|---|---|
| P0715 / P0716 | Input / turbine speed sensor circuit – malfunction, range or no signal |
| P0717 / 2204 | Turbine speed sensor Y3/8n1 – no signal |
| P0718 / 2205 | Turbine speed sensor Y3/8n1 – intermittent / defective |
| P0719 | Torque converter brake switch circuit low |
| P0720 – P0723 | Output speed sensor – malfunction, range, no signal, intermittent |
| P2766 / P2767 / P2768 / 2201 | Internal speed sensor Y3/8n2 – range, no signal, defective |
| P0705 | Transmission range sensor |
A fault code alone does not prove the unit has failed: low or old fluid, a leaking connector sleeve or wiring can produce the same codes. Check these first – different codes or none at all? Send them on WhatsApp before ordering.
Which cars use this unit
| Model | Chassis (years) |
|---|---|
| C-Class | W203 (2000–2008), W204 (2007–2015) |
| E-Class | W211 (2002–2010), W212 (2009–2017) |
| S-Class / CL | W221 (2005–2013), W216 (2006–2014) |
| CLK / CLS | W209 (2002–2010), W219 (2004–2010) |
| ML / GL | W164 (2005–2011), W166 (2011–2015), X164 (2006–2012), X166 (2012–2015) |
| R-Class | W251 (2005–2013) |
| SL / SLK | R230 (2001–2012), R171 (2004–2011), R172 (2011–2016) |
| Sprinter / Viano | Sprinter 2nd gen (2006–2018), Viano W639 (2003–2014) |
Fitted only where the car has the 722.9 7G-Tronic gearbox. Conductor plates include VGS2 A0335457332 and VGS3 A0034460310 – the label on your unit decides, so send us a photo first.
Check before you send it
- Check fluid level and condition and the connector sleeve on the gearbox for leaks.
- Read and save all fault codes and include them with the order.
- Remove the conductor plate with the ignition off, drain it and seal it in an anti-static bag. Do not bend the plate.
What happens on the bench
- Intake – photos, label, plate and sensor condition, signs of previous repair.
- Test – power-up, communication and sensor checks; fault confirmed before any work.
- Repair – the confirmed fault is repaired.
- Final test and report – the unit is checked again and you get a written report with the warranty seal number.
Price and payment
| Bench test & quote | £45 | Deducted from the repair if you go ahead. |
|---|---|---|
| Conductor plate repair | £249 | Speed sensor and internal faults confirmed on the bench. |
| Severe damage | Quoted | Burnt or physically damaged plates – written quote after the test. |
Every price includes the test, final check, report and tracked UK return. If the unit cannot be repaired, you are refunded the price less the £45 bench test. No VAT added – we are not VAT registered. 12-month warranty.
After fitting
Refit with fresh fluid and a new connector sleeve seal, then reset the adaptations and road test. Your garage can do this, or book it at our Mansfield workshop.
How to order
- Order and fill in the unit details – part number, VIN and fault codes.
- Post the unit using our packing instructions, or drop it at the lab in Rainworth by appointment.
- We test, repair and return it with the report – turnaround is confirmed when the unit arrives.
Questions
Will my car need coding after the repair? No – your own unit goes back with its software and data, so normally only the adaptation reset after refitting is needed.
Is it the unit or the gearbox? The bench test answers that. If the plate tests healthy, you only pay the £45 test and get the report to show your garage.
Will the warning light go out? Once the repaired unit is fitted, codes are cleared and adaptations reset, the light should stay off – if a code returns, the report helps your garage find the cause.
Can you fit it? Yes, by appointment at our Mansfield workshop.
Not sure of your part number? Send a photo of the label on WhatsApp before you order.
Common faults this service may resolve
- Gearbox in limp mode, stuck in 2nd or 3rd gear
- No gear changes or harsh shifts
- Gearbox fault message on the cluster
- P0717 / P0718 / P2767 speed sensor codes
Related fault codes: P0717 2204 P0718 2205 P2767 P2768 P0705 P0715 P0720
VEHICLE FITMENT
Compatibility guideVehicle lists are identification guidance, not a fitment guarantee. Send the complete part number and hardware revision for confirmation before ordering. A similar-looking unit is not proof of compatibility.
Part numbers
Identification guidance only – if your number is not listed, contact us before assuming the service is unsuitable.
How the service works
Warranty included
Questions customers ask
Do speed sensor codes P0717 or P0718 mean a faulty conductor plate?
Is my original plate repaired?
Which units do you repair?
Does the gearbox need adaptation after refitting?
How much does it cost?
Choose your service
- 12-month warranty on repairs
- Tracked UK return included
- No VAT added
- Written report with every unit
- Not repairable? Refund less the bench test
Shipping & drop-off
Post the unit to our lab in Rainworth, Nottinghamshire, or drop it in by appointment. Pack it in an anti-static bag with the fault codes and your VIN – see packing instructions. Tracked UK return is included in every price; turnaround is confirmed when the unit arrives.
Fitting in Mansfield
Fitting options are done by appointment at our Mansfield workshop: removal, refit, fault code clear, adaptations and road test. Book after ordering on WhatsApp or by email.
Questions
Repair, cloning or replacement – which do I need?
If your unit has a repairable fault, repair keeps your original and needs no programming. If it is damaged but readable, cloning to a matching used unit is usually cheapest. If it cannot be read or repaired, we quote a replacement with your data transferred where possible.
Will the car need coding after the work?
Not after a repair or a successful clone – the immobiliser and coding come from your original data. Some units need adaptations reset after fitting.
Does a fault code prove the unit is faulty?
No. Supply, earths, wiring, sensors and actuators can set the same codes. That is why every unit is tested first and you get a written report.
What if my unit is not faulty?
You pay only the bench test and receive the report to show your garage.
Do you remove immobilisers or emissions equipment?
No.
Not sure of the part number?
Send a photo of the label on WhatsApp or by email before ordering and we confirm the right service.
