722.9 Solenoid Kit 2002-2011, remanufactured and ready to install. Fits the 722.9. Ships fast from the USA.
If your earlier seven-speed Mercedes, an S550 or S350 on the W221 chassis, an E350, an ML or a GL, has started dropping into limp mode, flaring between gears, or banging into second, the cause is very often in the electrohydraulic plate that sits under the pan. This remanufactured set contains eight 722.9 solenoids, so the whole control side of a first-generation 7G-Tronic can be renewed in one job instead of replacing a single solenoid, closing the pan, and coming back for the next one in six months.
The 722.9 shifts by handing torque from one clutch or brake to another, and every one of those elements has its own electronically controlled regulator. On the standard torque-converter 722.9, Mercedes factory documentation numbers eight solenoid positions: Y3/8y1 sets working pressure, Y3/8y2 through Y3/8y7 control clutches K1, K2 and K3 and brakes B1, B2 and B3, and Y3/8y8 runs the torque converter lockup clutch. All of them plug straight into the conductor plate that carries the integrated control unit. Several are built to deliver full pressure when they lose power, which is how the transmission still moves in limp mode with everything switched off. When one regulator sticks or leaks, the clutch it feeds either slips or slams, and the control unit logs a fault against that position.
Start with a scan tool that reads the Mercedes transmission module, not just generic codes. Save the control unit data before clearing anything, note which solenoid position the fault points to, and check whether the module communicates at all. If it will not talk after an ignition reset and a connector check, a solenoid set is the wrong part; the factory fix there is a complete electrohydraulic unit. Also look at the case connector for fluid wicking through the pins, since that sets the same codes. Rebuilders writing in GEARS Magazine report that on this transmission the coils themselves rarely fail; most problems come from cut, missing or hardened O-rings on the solenoid tips that leak and burn the clutch they control. Our 722.9 shift solenoid diagnosis guide covers the full sequence, and the 722.9 pressure control solenoid guide explains the regulator bore wear that can keep codes coming back after new solenoids.
This set is listed for the 722.9 from 2002 to 2011, with W221 S-Class models named among the applications. Be aware that the 722.9 replaced the five-speed in stages, so a very early car in that range may still have the 722.6; check the tag on the transmission case before ordering. Units built from 2010 onward moved toward the 7G-Tronic Plus update, so if your transmission is 2011 or later, compare it against the 722.9 solenoid kit for 2011-2016. Match the solenoid body, connector and tip shape to your old parts using the photos, or send your year and VIN and we will confirm before it ships. All of our parts for this family are on the 722.6 and 722.9 transmission page.
If the clutches are already burnt from a long-running leak, a solenoid set will not bring them back; the 722.9 master rebuild kit is the next step.
| Fits | 722.9 2002-2011 |
| Part type | Solenoid Kit |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Eight. That matches the eight solenoid positions on the standard torque-converter 722.9 electrohydraulic plate: working pressure, the six shift elements, and the converter lockup clutch.
Only if the car actually has the seven-speed. The 722.9 replaced the five-speed 722.6 in stages, so check the transmission tag or send us your VIN before ordering.
Yes. The solenoids and speed sensor are serviceable on the 722.9; the conductor plate and its integrated control unit are not. If the control unit will not communicate at all, the correct repair is a complete electrohydraulic unit instead.
These units were filled to MB 236.14. Fluids carrying that approval are backward compatible with the original 236.12 fill. Check the level at the specified fluid temperature.
Yes. Clear the stored faults and reset the transmission adaptations with a tool that supports the 722.9, then road test through all seven gears so the module relearns.
