Mercedes-Benz 7G-Tronic 722.9 TCU Repair VGS3-V (A0009019400)

SKU TRA4430

Common Faults:

P0717 2204 – The RPM signal from component Y3 / 8n1 turbine speed sensor (VGS) is unavailable
P0718 2205 – The component Y3 / 8n1 (turbine speed sensor (VGS) is defective
P2767 – The RPM signal from component Y3 / 8n2 Internal speed sensor (VGS) is unavailable
P2768 – The component Y3 / 8n2 Internal speed sensor (VGS) is defective
P0705 – Transmission range sensor fault
Other faults on request
Please see more possible faults below

From £239.00

Fast Turnaround 1-3 working days

Warranty Protection Covering all our repairs

Choose your service

Repair Service (by post) Send us your unit — we repair and return it. Add to order and complete the quick vehicle form; free UK shipping label included. Send us your unit. We repair & return it. Free UK shipping label. £239.00 (Excl. 20% VAT)

Service

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★★★★★ “It’s good to have this gang on hand when it comes to gearbox electronics.” — Pawel P.

★★★★★ “Very professional , very prompt, well organised, thank you.” — Peter B.

★★★★★ “Good service on phone when ordering. Not able to say any more until part is fitted and see how it works!” — Eddie M.

★★★★★ “Had a part that was difficult to get hold of but they went the extra mile for a solution” — Johnathan M.

★★★★★ “Whole process of repairing my ABS module went smoothly without any issues. Staffs were friendly and professional. Will definitely use them again.” — zarif S.

★★★★★ “CU had great customer service and are very knowledgeable in what they do. Had a troublesome gear box mech which they sorted. Couldn't have been better to deal with. Highly recommend.” — Andy B.

Mercedes-Benz 7G-Tronic 722.9 TCU VGS3-V repair

24-month warranty1–3 day turnaroundTracked return deliveryRepair or replacement

Two ways to fix the Mercedes-Benz 7G-Tronic 722.9 TCU VGS3-V. Listed under part number A0009019400. Repair — send us your original unit, we replace the failed components on the board and return the same unit, so it keeps the coding and security data already matched to your car and needs no programming (24-month warranty). Replacement — a brand-new unit with data transfer included; your original still has to be sent in so we can copy its coding and adaptation data across (12-month warranty). Both usually turn round in 1–3 working days.

Not sure the TCU is the cause? The symptoms and the fault codes we see on this unit are listed under Common Faults. If your codes differ, send them over before ordering — if the unit turns out not to be faulty you only pay the test fee and return postage.

Which vehicles does this TCU fit?

This unit is used across Mercedes. Check your exact model and year under Matching Vehicles, or compare the number printed on your own unit with the part numbers listed on this page. The same hardware often appears under several part numbers — call 01884 798090 if yours is not shown.

Prefer not to remove the unit yourself?

Choose the on-site option and bring the vehicle to our workshop in Uffculme, Devon. We remove, refit and road-test it before you drive away, usually the same day.

Frequently asked questions

Should I choose repair or replacement?

Repair is the usual choice: you get your own unit back with its coding intact and a longer warranty. A replacement makes sense when the unit is beyond economical repair — it is brand new, and your original still has to be sent in so we can transfer the data across.

How long will I be without the unit?

We work on a 1–3 working day turnaround once your unit reaches us, and it goes back on a tracked service. Ask about on-site fitting if you need the car back the same day.

My part number isn’t in the list — can you still help?

Usually yes. The same hardware appears under many part numbers. Send us a photo of the label or call 01884 798090 and we’ll confirm before you send anything.

What warranty do I get?

Repairs carry a 24-month warranty and replacement units 12 months. See Returns & Warranty for the full terms.

Will the warning light go out after the work?

Yes, once the unit is refitted and the stored codes are cleared, provided the fault was in this unit. If a related wiring or sensor fault is also present it has to be fixed separately — we tell you what we found.

Common Faults

What are the symptoms of a failing Mercedes-Benz 7G-Tronic 722.9 TCU VGS3-V TCU?

Harsh, jerky or delayed gear changes
Gearbox dropping into limp mode, or a complete loss of drive
Flashing gear indicator on the instrument cluster
A “gearbox malfunction” warning on the dash
No response when selecting D or R
Gearbox goes into limp home mode
Stuck in gear or holding in gear, unable to select any gear
Intermittently not changing gear

Common fault codes

Fault code	Meaning
P0715	Input/Turbine Speed Sensor Circuit Malfunction
P0716	Input / Turbine Speed Sensor Circuit Malfunction / Range Performance / No Signal / Intermittent
P0717	Input / Turbine Speed Sensor Circuit No Signal
P0718	Input / Turbine Speed Sensor Circuit Intermittent
P0717	2204 – The signal from component Y3 / 8n1 (turbine speed sensor (VGS) is unavailable
P0718	2205 – The component Y3 / 8n1 (turbine speed sensor (VGS) is defective
P0719	Torque Converter Brake Switch Circuit Low
P0720	Output Speed Sensor Circuit Malfunction
P0721	Output Speed Sensor Range/Performance
P0722	Output Speed Sensor No Signal
P0723	Output Speed Sensor Intermittent
P2766	Input / Turbine Speed Sensor Y3/8n2 Circuit Range / Performance
P2767	The signal from component Y3 / 8n2 (Internal speed sensor (VGS) is unavailable
P2768	The component Y3 / 8n2 (Internal speed sensor (VGS) is defective
2201	the component Y3/8n2 (internal speed sensor)
P0705	Transmission range sensor fault

Seeing different codes, or not sure the TCU is the cause? Call 01884 798090 — we’ll check your codes and symptoms before you send anything.

Matching Vehicles

Make	Model	Years
Mercedes	C-Class	W203 (2000-2008), W204 (2007-2015)
Mercedes	CL-Class	W216 (2006-2014)
Mercedes	CLK-Class	W209 (2002-2010)
Mercedes	CLS-Class	W219 (2004-2010)
Mercedes	E-Class	W211 (2002-2010), W212 (2009-2017)
Mercedes	GL-Class	X164 (2006-2012), X166 (2012-2015)
Mercedes	M-Class	W164 (2005-2011), W166 (2011-2015)
Mercedes	R-Class	W251 (2005-2013)
Mercedes	S-Class	W221 (2005-2013)
Mercedes	SL-Class	R230 (2001-2012)
Mercedes	SLK	R171 (2004-2011), R172 (2011-2016)
Mercedes	Sprinter	2nd gen (2006-2018)
Mercedes	Viano	W639 (2003-2014)

How It Works

Place your order online — add the service you need to your basket. Before the item is added we ask for your vehicle details and fault codes, so we know exactly what we are working on.
Send us your unit — replacements are supplied on an exchange basis, so we need your original unit to transfer its coding data. Prefer to program the new unit yourself? Order first and send your original afterwards.
We do our part — we transfer your data to the new unit and test it, usually within 1–3 working days.
Tracked return delivery — by DHL Express or DPD, ready for installation.

On-site fitting — choose the on-site option and call us to book a slot. We remove, repair and refit the unit while you wait (usually 2–3 hours) and road-test the car before you drive away.

Need to know more? Call 01884 798090 or see How to order · Delivery pricing · Returns & warranty.

Customer Service

Mercedes-Benz 7G-Tronic 722.9 TCU Repair VGS3-V (A0009019400)