Mercedes-Benz 7G-Tronic 722.9 TCU VGS4 Replacement Unit (A0009017100)

SKU TRA1383

12-month warranty
Transmission Control Unit
Part No: A 000 901 71 00
Fits Mercedes-Benz models
Restores transmission functionality

From £549.00

Fast Turnaround 2-5 working days

Warranty Protection Covering all our repairs

Choose your service

Replacement Units All replacements are sold on an exchange basis. If you need the unit shipped first, please contact our customer service. Replacement unit, supplied on an exchange basis. Data transfer included. £549.00 (Excl. 20% VAT)

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★★★★★ “Any issues with abs units this is the team to sort it 👍” — Adrian B.

★★★★★ “really good company , very fast repair done on a.b.s. control unit” — Anonymous

★★★★★ “Excellent service. Great company to deal with, very helpful. Would certainly use again.” — Gordon M.

★★★★★ “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.

Mercedes-Benz 7G-Tronic 722.9 TCU VGS4 replacement

24-month warranty2–5 day turnaroundTracked return deliveryData transfer included

A brand-new Mercedes-Benz 7G-Tronic 722.9 TCU VGS4. Listed under part number A0009017100. All replacement units are supplied on an exchange basis: every unit is tested before dispatch and the price includes data transfer, so your original must be sent in for us to copy its coding and adaptation data onto the new unit, and it stays with us as the exchange. Replacement units carry a 12-month warranty and normally leave us within 2–5 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.

Frequently asked questions

Do I still have to send my old unit in?

Yes. All replacement units are supplied on an exchange basis and have to be matched to your car: your original is needed for the data transfer — we copy its coding and adaptation data onto the new unit before it ships — and it stays with us as the exchange.

How long will I be without the unit?

Replacement units normally leave us within 2–5 working days of receiving your original. Should it take longer, we will contact you with an update. It comes 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?

Replacement units carry a 12-month warranty. 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 VGS4 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

Common fault codes

Fault code	Meaning
P0896	Impermissible Adjustment Of The Step-Down Ratio In CVT
P0793	RPM Signal From Y3/9B4 (CVT Secondary RPM Sensor) Not Available
P0722	RPM Signal From Y3/9B5 (CVT Output RPM Sensor) Not Available
P0730	Gear Ratio In CVT Not Permissible
P1634	Y3/9N1 (CVT Control Unit) Defective/Voltage Supply Faulty (Under Voltage)
P2722	Impermissible Closing Of Hydraulic Brake 'Reverse Gear' In CVT When 'N' Engaged
P0705	Component Y3/8s1 Selection Range Sensor Defective
P0717	Signal From Y3/8n1 Not Available
P0718	Component Y3/8n1 Defective
P0720	Output Speed Sensor Circuit Malfunction
P0721	Transmission Output Speed Signal Implausible Compared To Wheel RPM
P0722	Output Speed Sensor No Signal
P0723	Output Speed Sensor Defective
P2200	Signal From Y3/8n2 Not Available
P2201	Component Y3/8n2 Defective
P2550	Component Y3/8n3 Defective
P2767	Signal From Y3/8n2 Not Available
P2768	Component Y3/8n2 Defective

Different symptoms or fault codes – or no codes at all? Call 01884 798090 or use our contact form. We’ll help assess the issue before you send your unit.

How It Works

Repair by post 2–5 working days

Step 1

Order online

Add the service to your basket. We ask for your vehicle details and fault codes – no separate repair form.
Step 2

Send us your unit

Pack it securely and post it with the free UK shipping label – or ask us to arrange a collection.
Step 3

We test & repair

Every unit is tested first, then repaired within 2–5 working days. Not faulty? You only pay the test fee and postage.
Step 4

Back to you, tracked

Returned by DHL Express or DPD. Pay at checkout or choose Pay After Repair.

On-site fitting

Prefer on-site fitting?

Bring the vehicle to our workshop in Uffculme, Devon. We remove, repair and refit the unit while you wait (about 2–3 hours), road-test the car and you pay on collection.

Call to book

More details: How to order Delivery pricing Returns & warranty

9am - 5pm

Mercedes-Benz 7G-Tronic 722.9 TCU VGS4 Replacement Unit (A0009017100)