Mercedes 7G-Tronic - Seven Speed Automatic Gearbox Problem

7G-Tronic gearbox ECU fault

This is a very common fault for Mercedes vehicles fitted with the 7G-Tronic automatic transmission with gearbox code - 722.9, often causing the transmission to hold too long in one gear before aggressively forcing the next gear into place, this causes a very rough and jerky gear change.

The fault usually starts out as intermittent but always becomes permanent if left unresolved for long enough. The fault is caused by the TCM conductor plate breaking down internally, preventing the control module/conductor plate from monitoring the correct rotational speed of the input shaft, making it unable to determine the slippage of the torque converter, causing ineffective torque clutch lock-up that prevents a smooth gear change or in some cases prevents gear selection entirely.

We can now fully rebuild your own control unit within 1-2 working days and supply an unlimited mileage lifetime warranty*




When attempting to diagnose the transmission fault it is best practice to have the fault codes read from the transmission system as a first point of call, if you have fault codes stored for the internal speed sensors then this is a very good indication that you have a faulty transmission control module/conductor plate.


Common Failure symptoms:

  • Intermittently not changing gear
  • Gearbox goes into limp mode
  • Sticking in gear
  • Not selecting gears


Common fault codes:

  • 0717 – The Signal From Component Y3/8N1 (Turbine Speed Sensor, VGS) Is Not Available.
  • 0718 – The Component Y3/8N1 (Turbine Speed Sensor, VGS) Is Defective.
  • 2201 – The Component Y3/8N2 (Internal Speed Sensor) Is Defective.
  • 0722 – Output Speed Sensor Y3/8N3 Output Speed Sensor VGS Not Available
  • 0721 – The Transmission Output Speed Signal Is Implausible When Compared To The Wheel RPM Signal


Affected Vehicles:

This 7G-Tronic (722.9) control module is a common failure for the following 7 speed vehicles:



Common failing part numbers:

  • A0335457332
  • A0034460310
  • A0335456732
  • A0009013000
  • A0009013200
  • A0009017100


Removal instructions:

  1. Drain gearbox oil
  2. Remove oil pan & internal oil filter
  3. Unscrew the 10 screws holding the valve body to the gearbox
  4. Unplug the control module multi-plug connector and then remove valve body from the gearbox - do not use a pry-bar/screwdriver to force the multi-plug connector from the gearbox housing when removing the valve body or it may break the connector.
  5. Remove the 10 screws that hold the control module to the valve body

 7G-Tronic screw locations

  1. Remove the 8 solenoids that connect through the control module to the valve body (make note of their positions for correct re-installation)

7G-Tronic solenoid locations


Test and rebuild:

We can now fully rebuild your own 7G-Tronic control module and supply an unlimited mileage lifetime warranty for a fraction of the cost. When we rebuild your own control module we use higher rated components than standard, so you can be assured that once rebuilt, your control module will not fail again – this is how we are able to supply a lifetime warranty with every unit we rebuild.



These control modules are programmed to the vehicle’s immobiliser and chassis number, so it is not possible to fit a second-hand unit to the vehicle, the only option other than purchasing a brand new unit from the dealer is to have your own control module rebuilt. When we rebuild your control module we retain all the original programming so that you can just fit the unit back to the vehicle without any additional programming - simple plug and play.



We rebuild these 7G-Tronic control modules for Mercedes main dealers and specialists all over the globe, so you can be assured of our very high standard of work. We use higher rated than standard components when we rebuild your control module so you can be assured that once your unit is rebuilt then it will not fail again, therefore we give an unlimited mileage lifetime warranty with every control unit we rebuild.



Lifetime unlimited mileage*


How do I get my unit rebuilt?

To pay for the rebuild select your model above and then click: Get yours rebuilt

Print the payment/booking confirmation email.

Package the Mercedes 7G-Tronic transmission ECU inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received we will test, rebuild and return your 7G-Tronic control module with an unlimited mileage lifetime warranty. (if your unit turns out not to be faulty then we will refund your payment less a small testing fee and return shipping)


What if I don’t want to pay up front?

This is not a problem, if you prefer this option then follow the following steps:

Fill in and submit this test form.

Print the booking confirmation email.

Package the Mercedes 7G-Tronic transmission ECU inside a sturdy box with plenty of packaging material (make sure you include your confirmation email in the box).

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received, we will test your transmission control module and call you to advise on the outcome of testing, if your unit is faulty and you choose to go ahead with the rebuild then we will take payment over the phone using a debit/credit card.

We will then rebuild your 7G-Tronic ECU and return it to you with an unlimited mileage warranty.

If you require further information regarding this Mercedes 7G-Tronic transmission ECU, then please contact us.

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Comments on "Mercedes 7G-Tronic - Seven Speed Automatic Gearbox Problem"
Tim Adeboye says: 24/11/2019 7:07:53 AM
My 2012 Mercedes Benz E220 Executive SE gear engages intermittently and often times takes forever to engage. Very frustrating. How can you help? What do you think could be issues?
ECU Admin says: 25/11/2019 12:13:08 PM
Hi Tim, you may be experiencing a fault in the 7G-Tronic transmission ECU especially if your fault codes match those we have listed. For information on rebuild prices and shipping information just select your part from the following list:
michael lim says: 9/10/2019 5:04:28 AM
w212 year made 2013 7g tronic tcu promble show on on computer error code is 0717 The signal from component Y3/8n1 (Turbine speed sensor, VGS) is not available. 0718 The component Y38n1 (Turbine speed sensor, VGS) is defective. petrol engine 1.8 can please advise... need some good solution...tq
ECU Admin says: 9/10/2019 2:01:01 PM
Hi Michael, looks like you are experiencing a faulty 722.9 7G-Tronic transmission ECU fault. We offer test and rebuild for this, please see the following link for prices and shipping information:
Mujeeb says: 31/8/2019 10:01:35 AM
Hay there I got e220 diesel 2012 , engine light on and , when I go on drive it go with big jerk and gaer not shifting from first to second please any advice and how much it cost
ECU Admin says: 2/9/2019 9:46:48 AM
Hi Mujeeb, we can help with your 7G-Tronic problems. We offer test and rebuild of your transmission ECU, for prices and shipping information please see the following link:
nicolas says: 30/8/2019 9:38:05 PM
Hola buenas tardes tengo un mercedes benz e280 chasis w211, tengo la transmisión en modo de emergencia y tengo el código 0721. tengo un scanner star diagnosis mi pregunta es como puedo saber si el modulo de transmisión esta programado tanto en inmovilizador como en chasis?, en que me tengo que fijar en la parte de información del modulo?. agradecería su ayuda.
ECU Admin says: 2/9/2019 10:00:02 AM
Hi Nicolas, yes the 7G-Tronic units have SCN coding, you can find this in the transmission ECU system information through your diagnostics. The code you have stored indicates that you have a faulty unit, we can offer test and rebuild for this here:
Sebastian says: 5/8/2019 5:48:15 PM
Hi, I would like to know the cost of rebuilding the TCU , how much if the codes points to RPM sensor or solenoid and what would it be it the TCU cannot be read . Thanks,
ECU Admin says: 6/8/2019 9:34:27 AM
Hi Sebastian, Please select your vehicle model above for pricing and shipping information. We rebuild the entire 7G Tronic TCU no matter what the fault. So it does not matter if you have RPM sensor, solenoid or communications issues, many thanks.
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