Mercedes 7G-Tronic – Seven Speed Automatic Gearbox Problem

7G-Tronic Gearbox ECU Fault:

A prevalent issue with Mercedes vehicles equipped with the 7G-Tronic automatic transmission (gearbox code – 722.9) is a gearbox ECU fault. This problem often manifests as the transmission holding too long in one gear before forcefully shifting to the next, resulting in a rough and jerky gear change.

The root cause of this fault is typically the breakdown of the Transmission Control Module (TCM) conductor plate within the gearbox. If left unresolved, this issue progresses from intermittent to permanent. The internal breakdown hinders the TCM from accurately monitoring the rotational speed of the input shaft, making it unable to determine torque converter slippage. Consequently, this leads to ineffective torque clutch lock-up, causing rough gear changes or, in severe cases, preventing gear selection altogether.

We offer a comprehensive solution by fully rebuilding your existing control unit within 2-3 working days, providing an unlimited mileage lifetime warranty*.

Diagnosis:

For an accurate diagnosis, it is recommended to retrieve fault codes from the transmission system. If fault codes related to internal speed sensors are present, it indicates a faulty transmission control module/conductor plate.

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Common Failure Symptoms:

• Intermittent failure to change gears
• Transmission going into limp mode
• Sticking in gear
• Failure to select 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

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 remove the valve body from the gearbox
5. Remove the 10 screws holding the control module to the valve body
6. Remove the 8 solenoids that connect through the control module to the valve body

Test and Rebuild:

We fully rebuild your 7G-Tronic control module using higher-rated components, ensuring long-lasting performance. Our process includes testing under real-world conditions and providing an unlimited mileage lifetime warranty.

Programming:

Retaining the original programming, our rebuilt control modules offer a plug-and-play solution without the need for additional programming. These modules are programmed to the vehicle’s immobiliser and chassis number.

Quality:

As a trusted provider for Mercedes main dealers and specialists worldwide, we uphold a high standard of work. Our use of superior components guarantees the reliability of your rebuilt control module.

Warranty:

Lifetime unlimited mileage*

How to Get Your Unit Rebuilt:

1. Select your model and click “Get yours repaired.”
2. Print the payment/booking confirmation email.
3. Package the Mercedes 7G-Tronic transmission ECU securely and send it via tracked courier.
4. Once received, we will test, rebuild, and return your 7G-Tronic control module with a lifetime warranty.

Payment Options:

Choose between paying upfront or opting for testing before payment. In the latter case, we will assess the unit, and if faulty, payment can be made over the phone.

For further information or inquiries about the Mercedes 7G-Tronic transmission ECU, please contact us.
Contact AUTOTRONICS at 0116 276 7054 or email us at [email protected] for expert assistance. Our experienced engineers are here to solve all your queries and provide top-notch services.

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