D
I stumbled upon this site. It seems to have some solid 7G transmission information.
www.mercedesmedic.com
vic
Added: Mercedesmedic .com site.
722-9-7g-tronic-automatic-transmission-problems-solution
I hope access to the link doesn't go away. Some of the text.
Advantages of Mercedes 7G Automatic Transmission
There are several advantages to having 7 gears. Here is a list of benefits of the Mercedes-Benz 7-Speed transmission over the previous generation 5-Speed transmission (722.6).
The transmission control unit in the 7G Tronic transmission monitors your driving style and adapts the transmission shift points based on the way you drive. For example, if you are an aggressive driver you may notice that the transmission will stay in gear longer to allow the engine to reach higher RPMs.
7G Tronic Transmission Problems – 722.9xxx
Below you will find a list of common problems with the Mercedes-Benz 722.9xx 7G Tronic 7-Speed Automatic Transmission.
This list if for reference only. If you are experiencing problems with your Mercedes-Benz it is important to also read the fault codes from the automatic transmission unit via the OBD-II port located under the dashboard. In order to do that, you will need a scanner that can read TCU fault codes on a Mercedes. Any of the following scanners (Amazon links provided) should work:
The 722.9 transmission was installed in Mercedes-Benz models as early as 2004. By 2008 it replaced the 722.6 5-Speed transmissions on all MB models. There are a few common issues with this transmission, but the majority of the problems do not require a complete transmission overhaul. Replacing the defective solenoid, conductor plate or the valve body is all that needs to be performed to fix the majority of problems in the 7-Speed transmission.
This is a list of common problems with the 7-speed 722.9xx transmission:
Defective valve body or the conductor plate are usually the cause for these problems.
The most common fault codes of the 7 Speed Automatic Transmission are listed below.
7G Tronic Fault Codes
This problem is usually fixed by replacing the conductor plate or the valve body which depends on the VGS version. If a new TCU is installed, it will require programming to match the VIN of the vehicle.
Related Failure Codes
Error Code 0717 – The signal from component Y3 / 8n1 (turbine speed sensor (VGS)) is unavailable.
Error code 0718 – The component Y3 / 8n1 (turbine speed sensor (VGS)) is defective.
Error code 2767 – The signal from component Y3 / 8n2 (Internal speed sensor (VGS)) is unavailable.
Error code 2768 – The component Y3 / 8n2 (Internal speed sensor (VGS)) is defective.
722.9 7G Tronic Automatic Transmission Problems and Solutions – MB Medic
www.mercedesmedic.com
vic
Added: Mercedesmedic .com site.
722-9-7g-tronic-automatic-transmission-problems-solution
I hope access to the link doesn't go away. Some of the text.
Advantages of Mercedes 7G Automatic Transmission
There are several advantages to having 7 gears. Here is a list of benefits of the Mercedes-Benz 7-Speed transmission over the previous generation 5-Speed transmission (722.6).
- Smoother shifting and driver comfort
- Quicker upshifts / downshifts
- Better acceleration times due to improved control of gear changes and available gear ratios.
- Improved fuel economy.
- Better matching of engine RPM and vehicle speed.
The transmission control unit in the 7G Tronic transmission monitors your driving style and adapts the transmission shift points based on the way you drive. For example, if you are an aggressive driver you may notice that the transmission will stay in gear longer to allow the engine to reach higher RPMs.
7G Tronic Transmission Problems – 722.9xxx
Below you will find a list of common problems with the Mercedes-Benz 722.9xx 7G Tronic 7-Speed Automatic Transmission.
This list if for reference only. If you are experiencing problems with your Mercedes-Benz it is important to also read the fault codes from the automatic transmission unit via the OBD-II port located under the dashboard. In order to do that, you will need a scanner that can read TCU fault codes on a Mercedes. Any of the following scanners (Amazon links provided) should work:
The 722.9 transmission was installed in Mercedes-Benz models as early as 2004. By 2008 it replaced the 722.6 5-Speed transmissions on all MB models. There are a few common issues with this transmission, but the majority of the problems do not require a complete transmission overhaul. Replacing the defective solenoid, conductor plate or the valve body is all that needs to be performed to fix the majority of problems in the 7-Speed transmission.
This is a list of common problems with the 7-speed 722.9xx transmission:
- Transmission does not shift gears or work properly until it warms up.
- Delayed or unpredicted shifting of gears. Upgrading the TCU software and resetting the transmission shift points may solve this problem. You will need either the dealer or an auto repair shop that has Mercedes Star Diagnostic C3 or C4 scanner.
- Transmission slips between 1st and 2nd gear. As soon as this is detected by the TCU, transmission goes into limp mode. Turning off and then off the engine may temporarily return the transmission to normal operation.
- Conductor plate defective. Replacement required which can cost between $2000-$3000. The first generation of the 722.9 may require the replacement of the valve body as well.
- Accelerating from a stop light can cause the car to get stuck in 2nd gear, limp mode.
- Standing water in contact with the housing can cause damage to the transmission housing if left in contact for several weeks.
- Hard shifting trasnmission problems.
Defective valve body or the conductor plate are usually the cause for these problems.
The most common fault codes of the 7 Speed Automatic Transmission are listed below.
7G Tronic Fault Codes
- P0717 Input Turbine Speed Sensor Circuit No Signal
- P0718 Input / Turbine Speed Sensor Circuit Intermittent
- P0700 Transmission Control System TCS Malfunction
- P0748 Pressure Control Solenoid ‘A’ Electrical
- P0778 Pressure Control Solenoid ‘B’ Electrical
- P0798 Pressure Control Solenoid ‘C’ Electrical
- P2716 Pressure Control Solenoid “D” Electrical
- P2725 Pressure Control Solenoid (E)
- P2734 Pressure Control Solenoid ‘F’ Electrical
- P2810 P2759
- P0717 Input/Turbine Speed Sensor A Circuit No Signal
- U0101 – no communication with the TCM
This problem is usually fixed by replacing the conductor plate or the valve body which depends on the VGS version. If a new TCU is installed, it will require programming to match the VIN of the vehicle.
Related Failure Codes
Error Code 0717 – The signal from component Y3 / 8n1 (turbine speed sensor (VGS)) is unavailable.
Error code 0718 – The component Y3 / 8n1 (turbine speed sensor (VGS)) is defective.
Error code 2767 – The signal from component Y3 / 8n2 (Internal speed sensor (VGS)) is unavailable.
Error code 2768 – The component Y3 / 8n2 (Internal speed sensor (VGS)) is defective.
Last edited: