Mercedes 7G Tronic 722.9 Transmission History
Holding the title of “oldest automobile manufacturer on earth” means that you have to go above and beyond normal expectations to raise the bar in the field that you helped create. So in 2003, Mercedes Benz introduced the world’s first seven speed automatic transmission. The Mercedes 722.9 transmission was the result of over three years of development, where some of the world’s brightest automotive engineers collaborating into create a Mercedes 7-speed automatic transmission that can provide exhilarating performance in high horsepower models. As well as high-efficiency in the more value-oriented model ranges. Naturally, some Mercedes 7G Tronic transmission problems occur, particularly with the 722.9 conductor plate and valve body.
What Transmission Do I Have?
Looking for a 722.9 conductor plate? Visit Street Smart Transmission who sells the 722.9 plate and valve body.
722.9 Transmission Overview
Mercedes Benz has been producing their own automatic transmissions since the 1950s. The Mercedes 7G-Tronic 722.9 transmission is the fifth generation of their transmission line, and it is used in everything from the top of the line Mercedes S-Class, all the way down to the Mercedes C-Class. It has seven forward gears and two reverse gears, which are created by 2 simple planetary gearsets, and 1 Ravigneaux gearset. The 722.9 transmission has four multi-disc brakes and three multi-disc clutches, which give it the ability to drop multiple gears in a single downshift.
The difference between a Mercedes 7G Tronic and a Mercedes 7G Tronic Plus
Introduced in the fall of 2010, the Mercedes 722.9 7G Tronic Plus transmission was the next evolution of the marque’s 7-speed automatic transmission. The idea was to improve the transmission’s design, so this could better withstand the torque of more modern turbocharged engines. As well as be compatible with engine start/stop systems. A number of small improvements were made to the Mercedes 7G Tronic Plus 722.9 transmission. But the biggest improvement was a new 722.9 torque converter that featured a unique damping system that can better handle the torque and vibration better than the previous generation.
Common Mercedes 7G Tronic 722.9 Transmission Problems & Technical Service Bulletins
722.9 transmission conductor plate problems
The 722.9 input speed sensor and 722.9 output speed sensor are actually built into the conductor plate by the TCM. If one of them fails, the transmission can default to ‘limp mode’ where it will be stuck in 2nd gear. Early versions of the TCM known as Mercedes VGS1 (mostly used up until 2007), will require that you buy both the new 722.9 conductor plate and a new 722.9 valve body. However you can buy just the TCM if your vehicle is equipped with the later model Mercedes VGS2 or Mercedes VGS3.
Diagnostic trouble codes commonly associated with 722.9 conductor plate problems and 722.9 valve body problems include:
P0717 – Input/Turbine Speed Sensor Circuit No Signal – If the ECU can’t communicate with the input speed sensor, this DTC gets stored.
P0718 – Input/Turbine Speed Sensor Circuit Intermittent – This diagnostic trouble code means there is an intermittent connection between the ECU and the turbine speed sensor.
P2766 – Input Sensor / Turbine Speed Sensor B Performance – This diagnostic trouble code means the engine control unit (ECU) has detected a problem with this TSS sensor.
P2767 – Input Sensor / Turbine Speed Sensor B No Signal – This DTC indicates the ECU isn’t receiving a signal from this sensor.
P2768 – Input Sensor / Turbine Speed Sensor B Intermittent Signal – If this diagnostic trouble code is stored, it means the signal coming from the TSS sensor is not steady, and the ECU can’t formulate a shift strategy.
7G Tronic 722.9 Torque Converter Problems
One of the most common Mercedes 7G Tronic torque converter problems happens when the vehicle shudders or shakes excessively under load. This condition typically occurs when accelerating from a stop or up an incline.
Cause – This issue is typically caused by either dirt to getting into the TCC solenoid and preventing it from operating properly. Or the clutches inside of the torque converter could be excessively worn, which means you will be able to feel them operate, resulting in the shuttering / shaking feeling. If this is the case, a new 722.9 torque converter will be required.
722.9 Transmission Specs
General – 7-speed automatic with 2 reverse gears
Application – RWD & 4WD / AWD
Production Began – 2004 (U.S. models)
Case – Magnesium case with aluminum bell housing
7G Tronic 722.9 Transmission Fluid – Mercedes 001 989 45 03 Transmission Fluid / MB 236.14 ATF
7G Tronic 722.9 Transmission Fluid Capacity – 10 qts
7G Tronic Plus 722.9 Transmission Fluid – Mercedes Genuine ATF FE A000 989 09 04 Transmission Fluid / MB 236.15 ATF / Mobil ATF 134 FE
7G Tronic Plus 722.9 Transmission Fluid Capacity – 10 qts
722.9 Transmission Gear Ratios
First – 4.37
Second – 2.85
Third – 1.92
Fourth – 1.36
Fifth – 1.00
Sixth – 0.82
Seventh – 0.72
Reverse 1 – 3.41
Reverse 2 – 2.23
What Transmission Do I Have?
Looking for a 722.9 conductor plate? Visit Street Smart Transmission who sells the 722.9 plate and valve body.
