Mercedes-Benz 722.8 CVT TCU VGS2 Replacement Unit (A0034462410)

SKU TRA0611

12-month warranty
Plug and play, coded to your VIN
Fits Mercedes A-Class and B-Class
Sold on exchange basis
Restores transmission functionality

Common faults Matching Vehicles

From £449.00

Fast Turnaround 2-5 working days

Warranty Protection Covering all our repairs

In stock

★★★★★ “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 722.8 CVT TCU VGS2 replacement unit (A0034462410)

24-month warranty2–5 day turnaroundTracked return deliveryRepair or replacement

Two ways to fix the Mercedes-Benz 722.8 CVT TCU VGS2. Listed under part number A0034462410. 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 2–5 working days.

We need your VIN before we can ship. This unit is coded to your vehicle, so please provide the accurate VIN number when placing your order to guarantee correct programming. It is supplied on an exchange basis — your original unit has to come back to us.

This is the replacement-unit listing for part A0034462410 — prefer your own unit repaired? See the repair listing.

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 aim to complete all repairs within 2–5 working days. Should a repair take longer, we will contact you with an update. It goes back to you 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 722.8 CVT TCU VGS2 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
Transmission Visit workshop warning on dash
Transmission can go straight into limp mode when selecting drive, slipping, loss of all drive and unable to select drive. These symptoms usually start off intermittently and become more frequent until total failure.

Common fault codes

Fault code	Meaning
P1815 / 0717	The speed signal from component Y3 / 9b3 (primary speed sensor CVT) is not available
P1826 / 0722	The speed signal from component Y3 / 9b5 (output speed sensor CVT) is not available
P1939 / 0793	Speed signal from component Y3 / 9b4 (secondary speed sensor CVT) is not available
0723	The rpm signal from component Y3/9b5 CVT (output rpm sensor) is implausible
0739	The rpm signal from component Y3/9b4 CVT - secondary rpm sensor is not available
0794	Intermediate Input Shaft Speed Sensor Signal
P2198 / 0730	The gear ratio in the transmission (CVT) is not permissible
0720	Speed Gradient
1634	Component Y3 / 9n1 (CVT) is defective or the power supply is faulty (under voltage)
0896	impermissible adjustment of the step down ratio in the continuously variable automatic transmission (CVT)

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	A-Class	W169 (2004-2012)
Mercedes	B-Class	W245 (2005-2011)

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 2–5 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.

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Mercedes-Benz 722.8 CVT TCU VGS2 Replacement Unit (A0034462410)