Mercedes-Benz 5G-Tronic Tcu 722.6 Replacement Unit (NEW)

SKU TRA6729

12-month warranty
New (TCU) Replacement
Plug’n’Play – No coding required
Mercedes Part No: A 140 270 11 61
Fits Mercedes-Bens models

Common faults Matching Vehicles

From £249.00

Fast Turnaround 2-5 working days

Warranty Protection Covering all our repairs

In stock

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Mercedes-Benz 5G-Tronic 722.6 TCU — new replacement unit

12-month warranty2–5 day dispatchTracked deliveryNo coding required

A brand-new transmission control unit for the Mercedes-Benz 722.6 (5G-Tronic) gearbox, replacing part number A 140 270 11 61. It arrives plug-and-play: no coding, no programming and no data transfer — fit it and drive, which makes it a straightforward job for a workshop and realistic for a competent DIY fitter. Every unit is tested before dispatch, dispatched within 2–5 working days and covered by a 12-month warranty.

Not sure the TCU is the cause? The symptoms and the fault codes we see on the 722.6 are listed under Common Faults. Speed-sensor codes in particular can point either at the control unit or at the conductor plate inside the gearbox — if your codes differ, send them over before ordering.

Which vehicles does this 722.6 TCU fit?

The 722.6 was fitted across most of the Mercedes range, from the C-Class, E-Class and S-Class through the CLK, M-Class and SL to the Sprinter, Vito and Viano vans. Check your exact model and year under Matching Vehicles, or compare the number printed on your own unit with the part number above.

Frequently asked questions

Does this unit need coding or programming?

No. This 722.6 TCU is supplied plug-and-play: fit it, and the gearbox works without a dealer visit or a coding session. That is what separates it from most replacement control units, which have to be matched to the car before they will run.

Do I have to send my old unit in?

No. Because no data has to be transferred across, you can order the new unit and fit it straight away. Keep your old one until the car is running properly, then dispose of it as you see fit.

How do I know this is the right part for my car?

Compare the number on your own unit with A 140 270 11 61, and check your model and year under Matching Vehicles. The same 722.6 hardware appears under several numbers — send us a photo of the label or call 01884 798090 and we’ll confirm before you order.

Is it new or refurbished?

Brand new, not a rebuilt unit. It is tested before dispatch and carries a 12-month warranty. See Returns & Warranty for the full terms.

The gearbox still misbehaves after fitting — what now?

A TCU fault and a mechanical fault can look identical from the driver’s seat. If the symptoms remain, the cause is usually in the valve body, the conductor plate or the speed sensors rather than the control unit. Call us with the stored codes and we’ll tell you what we see on these boxes.

Common Faults

What are the symptoms of a failing 722.6 TCU?

Harsh, jerky or delayed gear changes
Gearbox dropping into limp mode, or a complete loss of drive
No response when selecting D or R
A “gearbox malfunction” warning on the dash
Speed-sensor codes stored against the transmission

Common fault codes

Fault code	Meaning
13	Speed sensor N3
109	Speed sensor N3
0717	No signal from Y3/8n1 (turbine speed sensor, VGS)
2767	No signal from Y3/8n2 (internal speed sensor, VGS)
P2200	Y3/6n2 speed sensor 2 faulty
P2203	Y3/6n3 speed sensor 3 faulty

Speed-sensor codes can point at the control unit or at the conductor plate inside the gearbox. Seeing different codes? Call 01884 798090 — we’ll check them before you order.

Matching Vehicles

Make	Model	Years
Mercedes	C-Class	W203 (2000-2008), W204 (2007-2015)
Mercedes	CLK-Class	W209 (2002-2010)
Mercedes	E-Class	W211 (2002-2010)
Mercedes	M-Class	W164 (2005-2011)
Mercedes	S-Class	W221 (2005-2013)
Mercedes	SL-Class	R230 (2001-2012)
Mercedes	Sprinter	2nd gen (2006-2018)
Mercedes	Viano	W639 (2003-2014)
Mercedes	Vito	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 — securely packed, or ask us to arrange a collection (UK only).
We do our part — we test your unit first, then repair it, usually within 2–5 working days. If it turns out not to be faulty, you pay only the test fee and postage.
Tracked return delivery — by DHL Express or DPD, with payment taken once the work is complete.

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

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Mercedes-Benz 5G-Tronic Tcu 722.6 Replacement Unit (NEW)