Rootes MotorsServicing & repairs

Mercedes C-Class 7G-Tronic and 9G-Tronic gearbox service — Milton Keynes

The W204 C-Class has the seven-speed 7G-Tronic (722.9); the W205 starts on the 7G-Tronic Plus and moves to the nine-speed 9G-Tronic (725.0). We confirm which yours has, then renew the fluid and filter at the right temperature and reset the adaptations.

Book your gearbox serviceCall 07746 922 273

Static service from £399, dynamic fluid exchange from £799, priced to your car. Get a price first — send the registration and we confirm the gearbox.

A cut-away automatic gearbox showing its clutch packs and planetary gear sets
Inside an automatic gearbox: clutch packs and gear sets, all running in the same fluid. Photo: Kirill Prikhodko on Unsplash

Which Mercedes C-Class cars have the Mercedes 7G/9G-Tronic

C-Class (W204)2007–2015
Petrol and diesel, rear- and four-wheel drive. 7G-Tronic (722.9); 7G-Tronic Plus on the 2011 facelift.[1, 2]
C-Class (W205)2014–2021
Petrol, diesel and plug-in hybrid. 7G-Tronic Plus (722.9) at launch; 9G-Tronic (725.0) from 2016.[3, 4]

Gearbox versions are as published by the car maker, ZF and the sources below. We confirm your car's exact gearbox from its VIN before ordering parts.

What to know about the 7G-Tronic and 9G-Tronic in a Mercedes C-Class

  • The W204 article lists the 7G-Tronic on the pre-facelift cars and the 7G-Tronic Plus on the facelifted cars from 2011. Both are 722.9 gearboxes, and we order the fluid and filter by your VIN.[1]
  • On the W205 the nine-speed 9G-Tronic replaced the seven-speed on most engines during 2016–2018 and was standard on the 2018 facelift. A 2014–2016 car is more likely to be a 7G-Tronic Plus.[3]
  • The AMG C 63 uses Mercedes-AMG's own SPEEDSHIFT gearbox instead, which is not the 7G-Tronic or 9G-Tronic.[3]

What the service includes

Static service, from £399:

  • Road test with live data before we start and again before handover
  • Pan off and filter renewed where the design allows, with a new seal and bolts where specified
  • The fluid specified for your gearbox, by part number — the 7G-Tronic and 9G-Tronic take different fluids
  • Level set by the method the gearbox calls for, with the fluid at the specified temperature read from live data
  • Adaptations reset, leak check, and the work recorded against your car

Dynamic fluid exchange, from £799: everything above, plus our machine connected into the cooler circuit to renew the fluid in the torque converter and cooler circuit, not just what drains from the pan. Dynamic exchange prices and booking · How the dynamic exchange works →

Each step is explained on our Mercedes 7G-Tronic (722.9) and 9G-Tronic (725.0) gearbox service page.

An engine and automatic gearbox removed from a car, on a workshop table
Engine and automatic gearbox out of the car on a workshop table. Photo: Myron Mott on Unsplash
A mechanic working on the underside of a car raised on a lift
Most of this work is done from underneath, with the car on a lift. Photo: Jimmy Nilsson Masth on Unsplash

The Rootes Standard

What you get on every job

Not extras, and not only on the big jobs. This is how every car is looked after at Rootes Motors, from an oil service to a gearbox.

  1. Fixed price in writing before we start

    You get a fixed price in writing before any work begins. If we find anything else, we send you photos and a link to approve or decline it — nothing extra is done without your yes.

  2. 12-month warranty on parts we supply

    12-month warranty on parts we supply (wear items and consumables excluded), and every job is road-tested and checked before handover.

  3. Covers on, clean overalls, every car

    A seat cover, steering-wheel cover and floor mat go into every car before we touch it, and we work in clean overalls — never in a customer's car in dirty clothes.

  4. A warm, dry waiting room with coffee

    On a while-you-wait job you sit in a warm, dry waiting room with a coffee — not stood outside in the cold and rain.

  5. Paperless, with every job on record

    Booking is paperless. Every job is recorded against your car, and we email you the documents confirming the work completed.

  6. Automatic service and MOT reminders

    Every registered customer gets automatic service and MOT reminders by email, so a due date never slips past.

  7. MOT arranged on our street

    We arrange your MOT at the DVSA-approved test centre on our street, take the car there and back, and fix anything that fails.

Questions we get asked

Which gearbox does my C-Class have?

W204 (2007–2014) cars have the seven-speed 7G-Tronic. W205 (2014 on) cars have the 7G-Tronic Plus early on and the nine-speed 9G-Tronic from 2016. Send us your registration and we confirm it before quoting.

How often should a C-Class gearbox service be done?

Our own advice is around every 60,000 miles on average, sooner for cars that tow or are driven hard. Many were sold as filled for life, so a car with an unknown history should be done now.

My C-Class changes gear harshly when cold. Is it the fluid?

Old fluid and old learned values often cause that, and a service with an adaptation reset often helps. We road-test with live data first and tell you if it points to something else.

How much is a Mercedes 7G/9G-Tronic gearbox service on a Mercedes C-Class?

A static service (drain and fill, level set at the correct fluid temperature) is from £399, and a dynamic fluid exchange on our machine is from £799, both priced to your car. The price moves with which Mercedes 7G/9G-Tronic version it has, the pan and filter part and how much has to come off to reach it. Give us your registration and we confirm a fixed price in writing before we start.

Where these facts come from

  1. 1.Wikipedia, “Mercedes-Benz C-Class (W204)” (read 30 Oct 2026)7G-Tronic on the pre-facelift cars (2007–2011) and the 7G-Tronic Plus on the facelifted cars from 2011, per its transmission tables
  2. 2.Wikipedia, “Mercedes-Benz 7G-Tronic transmission” — applications list (read 30 Oct 2026)Which Mercedes models are listed with the 7G-Tronic (the page says its list makes no claim of completeness)
  3. 3.Wikipedia, “Mercedes-Benz C-Class (W205)” (read 30 Oct 2026)7G-Tronic Plus 2014–2018, the 9G-Tronic from 2016–2018 and standard on the 2018 facelift; AMG C 63 models use AMG SPEEDSHIFT
  4. 4.Wikipedia, “Mercedes-Benz 9G-Tronic transmission” — variants and applications (read 30 Oct 2026)Which Mercedes models and years are listed with the 9G-Tronic (type 725.0)

Other work we do on the same car

Diagnostics & electrics

Dealer-level diagnostics, and a written estimate before any work.

from £79See the service

Servicing

To the manufacturer schedule, service book stamped.

from £169See the service

Repairs

Brakes, clutches, suspension, cooling, cambelts, head gaskets and turbos.

from £120See the service

Further reading

Other cars with the Mercedes 7G/9G-Tronic

The same service, written up for other models we see.

Mercedes-Benz