In this guide, you will find step-by-step instructions on how to change the conductor plate (and valve body) on 722.6 transmissions installed on most 1998-2007 Mercedes-Benz vehicles including C-Class, E-Class, S-Class, CLS-Class, R-Class, ML-Class, G-Class etc. 

What you will need

Procedure

Instructions on how to change the conductor plate and valve body on Mercedes-Benz 722.6 5G transmission. 

  1. Allow the car to cool down. Raise your car using a car lift, ramps, or jack stands.Raise Vehicle get ready to change mercedes transmssion valve body conducotr plate
  2. Secure the vehicle with jack stands. Set parking brakes. Block rear wheels to prevent the vehicle from rolling back. 
  3. Remove the splash shield from under the vehicle. Mercedes Conductor Plate Valve Body DIYThey are held in place with several 8mm screws. Mercedes Transmission pan location
  4. Place an oil pan under the transmission. Locate the drain plug at the bottom of the transmission pan and remove it using a 5mm Allen Socket and drain all transmission oil. Mercedes 722.6 transmission drain plug Reinstall the drain plug using a new washer. Washer
  5. Remove the Allen or T30 Torx bolts that hold the transmission pan in place, but keep track of the position of every bolt as they are not all the same length.Bolts for transmission oil pan on mercedes benz 722.6 Lower the pan carefully, as there will be some oil left in it.Mercedes oil pan for transmission

     

  6. Remove the oil filter by pulling it downwards. When it comes out, a small amount of oil will splash out of the valve body.Replace transmission oil filter on mercedes c e s ml gl r g class

     

  7. Locate the plug connector from the transmission. Mercedes transmission 13 pin connector locationTurn the bayonet lock counterclockwise and pull the plug out.13 pin connector mercedes transmission Locate and remove the bolt found in the center using a deep 7mm socket, and wiggle the connector out.Mercedes 13 pin connector

     

  8. Locate and remove the T30 Torx bolts that hold the valve body and conductor plate assembly in place. Do this in a zig-zag pattern. Lower the valve body assembly from the car.Remove mercedes valve body

     

  9. Working on a clean table or workbench, remove the yellow plastic covers at the top side of the conductor plate. 722.6 5 gear automatic transmission valve bodyUnderneath it, there are six solenoids held in place by three brackets. Remove the T30 Torx bolts and pull out the solenoids carefully. Mercedes valve body

     

  10. The connector plate is held in place with plastic tabs. Pull it up until it breaks free, remove it from the valve body, and then install a new connector plate in the same way.Install new mercedes conductor plate

     

  11. When reinstalling solenoids, make sure to place them in their original locations. Reinstall the brackets and place the plastic covers back on.Mercedes Transmission Solenoid
  12. When raising the valve body assembly back into the gearbox, make sure that the gear selector lever fits into the sliding tab located on the side of the body.Mercedes transmisison gear selector level in transmissionIf you skip this step, your vehicle will not drive when placed in Reverse or Drive. 
  13. Smear a small amount of transmission oil on the o-ring of the new filter and push it into the hole in the valve body until it pops in to place.Replacing Mercedes transmission fluid filter

     

  14. Replace oil pan gasket. Mercedes Transmission Pan Gasket

     

  15. Clean the transmission pan very carefully. Avoid leaving any debris or lint in the oil pan.  There is a magnet at the front side, which you will need to remove and clean away any metal shavings from it before reinstalling. Mercedes Transmission Gasket Replacement
  16. Reinstall all transmission pan bolts. Take extra care when starting bolts, as they can cross-thread easily. Torque mercedes transmission oil panAt the first stage, hand-tighten them until snug in a criss-cross pattern. Then tighten them up to 8Nm with a torque wrench again in a criss-cross pattern.
  17. Under the hood, locate the transmission dipstick tube. Brake off the red clip.Mercedes transmission dipstick locationRemove the plug and place a suitable funnel into it. Pour in 3.5 liters of transmission oil and then put the dipstick in.
  18. Start the car and let it idle for 5 minutes. Drive it for another 5 minutes. During this time, shift it through the gears several times to make the oil move inside the transmission.
  19. Back under the hood, pull out the transmission dipstick to check the oil level and add more if needed.

In the end, you need to clear all error codes and recalibrate the transmission with a Mercedes-Benz scanner as this ensures the best performance. This can be done by a Mercedes specific diagnostic tool, or you can take it to a dealer or Mercedes specialist.

The Mercedes five-speed automatic called the Mercedes-Benz 5G-Tronic also known as 722.6, is their first electronically controlled transmission. If your car is from that time it most likely has a five-speed auto transmission. Although being robust and reliable in general, this transmission has a couple of weak points. One is a faulty conductor plate, another is leaking of the 13-pin connector. In this guide, we will be explaining exactly how to fix the issue(s).

Torque Specifications

  • 722.6 transmission pan bolts should be torqued to 8 Nm (71in. lbs.)
  • 722.6 transmission drain plug torqued to 20 Nm (15 in. lbs).

Applications

Mercedes S-Class

  • 1996–1998 Mercedes-Benz W140
  • 1999–2005 Mercedes-Benz W220
  • 2006–2013 Mercedes-Benz W221 (V12 models only)

Mercedes CL

  • 1996–1998 Mercedes-Benz C140
  • 2000–2006 Mercedes-Benz C215
  • 2007–2014 Mercedes-Benz C216 (V12 Models only)

Mercedes E-Class

  • 1996–2002 Mercedes-Benz W210 (all models except some early 1996 cars)
  • 2002–2006 Mercedes-Benz W211 (all models except 2004-2005 E500)
  • 2007–2009 Mercedes-Benz W211 (4-cyl and 4-matic only)
  • 2009–2011 Mercedes-Benz W212 (4-cyl models only)

Mercedes C-Class

  • 1997–2000 Mercedes-Benz W202
  • 2001–2005 Mercedes-Benz W203 (all models)
  • 2006–2007 Mercedes-Benz W203 (4-cyl and 4-matic models only)
  • 2007–2011 Mercedes-Benz W204 (4-cyl models only)

Mercedes CLK

  • 1998–2002 Mercedes-Benz W208
  • 2003–2005 Mercedes-Benz W209 (all models except 2005 CLK 500)
  • 2006–2009 Mercedes-Benz W209 (4-cyl and CLK 55AMG only)

Mercedes ML

  • 1998-2005 Mercedes-Benz W163

Mercedes G-wagon

  • 1996–2006 Mercedes-Benz W463 (all models)
  • 2007–2012 Mercedes-Benz W463 (G55 AMG only)

Mercedes SLK

  • 1997-2003 Mercedes-Benz R170
  • 2004-2010 Mercedes-Benz R171 (4-cyl models only)

Mercedes SL

  • 1997-2001 Mercedes-Benz R129
  • 2001–2004 Mercedes-Benz R230 (all models)
  • 2005–2006 Mercedes-Benz R230 (all models except SL500)
  • 2007–2011 Mercedes-Benz R230 (SL 55AMG and V12 models only)

Mercedes SLR

  • 2005-2009 Mercedes-Benz W199

Non Mercedes-Benz models

Maybach

  • 2002–2013 Maybach 57 and 62

Jeep

  • 2002-2012 Jeep Grand Cherokee[7] (02-04 WG Diesel W5J400, 05-10 WK V6, WK V8, WH V6 3.0 Diesel export only Steyr W5A580)
  • 2006-2010 Jeep Commander XK (3.7 gas) XH (3.0 diesel - export)
  • 2012-2018 Jeep Wrangler (JK)[8]

Dodge

  • 2005-2008 Dodge Magnum (AWD, RT, SRT8 only)
  • 2006-Present Dodge Charger (2006-2007 3.5L V6 HO) (2015+ Police Only)
  • 2007-2011 Dodge Nitro (4.0L Models only)
  • 2009-2014 Dodge Challenger
  • 2011-2012 Dodge Durango (V6 Models only)
  • 2003-2006 Dodge Sprinter Vans ( N. America)

Chrysler

  • 2004-2008 Chrysler Crossfire, all models[9]
  • 2005-2014 Chrysler 300

Jaguar

  • 1998-2003 Jaguar X308 (Supercharged models only)
  • 1998-2002 Jaguar XK (X100) (Supercharged models only)

Ssangyong

  • 1998–2014 Ssangyong Chairman H
  • 2004–2017 Ssangyong Rexton
  • 2005–2017 Ssangyong Rodius
  • 2006–Present Ssangyong Kyron
  • 2014-Present Ssangyong Actyon sports

Porsche

  • 2002-2005 Porsche 911 (996 series)
  • 2006-2008 Porsche 911 (997 series)

Freightliner

  • 2001-2007 Freightliner Sprinter Vans (USA)

FAQ

Do you have to program the conductor plate on 722.6 transmissions?

The new conductor plate comes pre-programmed and ready for fitment. 722.6 does not need coding in most cases.  However, you still need to clear the codes and run a calibration procedure to ensure the best results. This can be done by a MB specific diagnostic tool, or you can take it to a dealer, or a Mercedes specialist. 

What are some of the symptoms of a bad conductor plate or valve body? 

  • Harsh gearshifts
  • Downshifts taking more time than usual
  • Transmission going into Limp mode
  • Staying in second gear all the time

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