Mercedes 7G-Tronic (722.9) 7-speed automatic: problems, costs and what to check

Buy only with fluid records and a clean full-system scan, and avoid any car that has run in limp mode or judders at a steady speed.

Updated 26 October 2026

At a glance

What it is: Mercedes' first series 7-speed automatic, launched in 2003 as 7G-Tronic. Revised in 2010 as 7G-Tronic Plus. Fitted to C, E, S, CLS, M and GL classes, GLK, Sprinter and Vito.
Main faults: the control board with speed sensors (the conductor plate) fails and sends the car into limp mode. The torque converter lock-up clutch judders. The valve body wears. Old fluid causes harsh shifts.
Reliability: 2/5, because the control board can fail from about 50,000 km and a replacement board or mechatronic costs 850 to 1,700 EUR (Russia, 2019 press article).
DIY: 1/5, because every board or valve body change needs a full-system scanner and Mercedes coding (SCN coding) before the car drives properly.
Prefer: a car with fluid invoices showing the right fluid changed every 40,000 to 80,000 km, and a clean full-system scan. Avoid: a car stuck in 2nd, in limp mode, or with judder at a steady speed.

Known issues

Issue	Affects	Typical km	Repair cost
Conductor plate and speed sensor failure	All 722.9 cars; early 2004-2007 builds most	50,000 to 80,000 km	About 850 EUR for the control board (Russia, 2019 press article)
Torque converter lock-up clutch judder	All 722.9 cars; a Daimler bulletin covers Plus cars built 2011-2012	100,000 to 200,000 km	No confirmed price
Valve body and clutch pack wear	All 722.9 cars	100,000 to 180,000 km	1,500 to 1,700 EUR for a complete mechatronic (Russia, 2019 press article)
Old fluid and missed adaptation reset	All 722.9 cars	80,000 to 100,000 km	About 600 EUR for a flush with new fluid (Austria, 2022)

Before you buy

Read the shift pressure data with XENTRY or an equal Mercedes scanner. Bad result: pressure deviations above 0.5 bar, or adaptation values above 30 percent. Those point to valve body wear.
Read the full gearbox fault memory with a full-system scanner. An engine-only OBD2 reader does not show it. Bad result: speed sensor codes P0717, P0718, P0722 or P0793, or any stored limp mode.
Test drive cold and warm, and pull away from a stop. Bad result: stuck in 2nd, slipping between 1st and 2nd, or limp mode at about 48 km/h (30 mph).
Hold a steady light throttle at about 60 km/h. Bad result: a shudder or hum. A scanner shows converter slip; 5 to 25 rpm is normal, and above about 80 rpm points to clutch wear.
Ask for the fluid invoices and check the fluid. Bad result: no change after about 80,000 km, dark brown or black fluid, a burnt smell, or a fluid other than the one for the build. A wrong fluid can cause code P0741. Red-amber is the correct colour.
Ask a dealer whether bulletin LI27.20-P-055758 applies to the car's VIN, and whether it was done. Bad result: lock-up codes FC 2783 or FC 0741 still stored.

Models with this gearbox

Brand	Model	Generation	Production years	Power	Engine codes	ADAC versions
Mercedes-Benz	C-Klasse	203 facelift	2005–2008	204–272 PS (150–200 kW)	272920, 272940, 272960, 642910	66
Mercedes-Benz	C-Klasse	204	2007–2011	204–487 PS (150–358 kW)	156985, 271860, 272921, 272947, 272948, 272961, 272971, 272982, 642830, 642832, 642960, 642961, 651912	108
Mercedes-Benz	C-Klasse	204 facelift	2011–2015	120–517 PS (88–380 kW)	156982, 156985, 271820, 271860, 271950, 271952, 274910, 276957, 642830, 642832, 642834, 651911, 651912, 651913	162
Mercedes-Benz	C-Klasse	205	2014–2018	116–367 PS (85–270 kW)	274910, 274920, 276823, 651921, R9M	196
Mercedes-Benz	CL-Klasse	216	2006–2010	388–525 PS (285–386 kW)	156984, 273961, 273968	7
Mercedes-Benz	CLK-Klasse	209	2004–2005	306 PS (225 kW)	113968	5
Mercedes-Benz	CLS	219	2004–2008	224–514 PS (165–378 kW)	156983, 272964, 272985, 273960, 642920	5
Mercedes-Benz	CLS	218	2010–2014	204–408 PS (150–300 kW)	276952, 278922, 642 853, 642852, 642853, 642858, 651924	26
Mercedes-Benz	CLS	218 facelift	2014–2017	204–408 PS (150–300 kW)	276850, 278922, 642858, 651924	16
Mercedes-Benz	E-Klasse	211	2002–2006	190–314 PS (140–231 kW)	113E50, 272943, 272964, 629910, 642920	62
Mercedes-Benz	E-Klasse	211 facelift	2006–2009	190–514 PS (140–378 kW)	156983, 272922, 272943, 272964, 272985, 273960, 629910, 642920	78
Mercedes-Benz	E-Klasse	207/212	2009–2013	136–525 PS (100–386 kW)	156985, 271860, 272977, 272983, 272984, 273966, 273970, 273971, 276952, 276957, 278922, 642836, 642838, 642850, 642852, 642856, 642858, 651911, 651924, 651925	198
Mercedes-Benz	E-Klasse	207/212 facelift	2013–2017	136–408 PS (100–300 kW)	274920, 276820, 276850, 276952, 276957, 278922, 642838, 642852, 642858, 651911, 651924, 651925	212
Mercedes-Benz	GL-Klasse	166	2012–2015	258–435 PS (190–320 kW)	276821, 278928, 642826	4
Mercedes-Benz	GLC	253	2016–2018	320 PS (235 kW)	274920	2
Mercedes-Benz	GLE	166/292	2015–2018	333–442 PS (245–325 kW)	276821, 278928	4
Mercedes-Benz	GLK-Klasse	204	2008–2012	143–306 PS (105–225 kW)	272948, 272971, 276957, 642832, 642961, 651912, 651916	26
Mercedes-Benz	GLK-Klasse	204 facelift	2012–2015	143–306 PS (105–225 kW)	274920, 276957, 642832, 642835, 651912, 651916	12
Mercedes-Benz	M-Klasse	164	2005–2008	190–510 PS (140–375 kW)	113964, 156980, 272967, 273963, 629912, 642940	12
Mercedes-Benz	M-Klasse	164 facelift	2008–2011	190–510 PS (140–375 kW)	156980, 272967, 273963, 629912, 642820, 642940	21
Mercedes-Benz	M-Klasse	166	2011–2015	204–408 PS (150–300 kW)	276821, 276955, 278928, 642826, 651960	10
Mercedes-Benz	R-Klasse	251 facelift	2007–2010	190–388 PS (140–285 kW)	272945, 272967, 273963, 642950	54
Mercedes-Benz	R-Klasse	251 facelift 2	2010–2012	190–388 PS (140–285 kW)	272945, 272967, 273963, 276958, 642872, 642950	11
Mercedes-Benz	S-Klasse	221	2005–2009	235–525 PS (173–386 kW)	156984, 272965, 272975, 273922, 273924, 273961, 273968, 629911, 642930, 642932	22
Mercedes-Benz	S-Klasse	221 facelift	2009–2013	204–435 PS (150–320 kW)	272965, 272974, 272975, 273922, 273924, 273961, 273968, 276950, 278932, 629911, 642862, 642868, 642930, 642932, 651961	36
Mercedes-Benz	S-Klasse	217/222	2013–2017	231–455 PS (170–335 kW)	276824, 276960, 278929, 642861, 642867, 642868, 651921	78
Mercedes-Benz	SLK-Klasse	171	2004–2008	231–400 PS (170–294 kW)	113 989, 113989, 272942, 272963	8
Mercedes-Benz	SLK-Klasse	171 facelift	2008–2011	231–360 PS (170–265 kW)	113989, 272942, 272969	11
Mercedes-Benz	SLK-Klasse	172	2011–2016	184–306 PS (135–225 kW)	271861, 274920, 276956, 651980	9
Mercedes-Benz	Sprinter	906 facelift	2013–2018	114–190 PS (84–140 kW)	271.951, 642.896, 651.955, 651.957	107
Mercedes-Benz	Sprinter	907/910	2018–2021	114–190 PS (84–140 kW)	642.896, 651, 651.955, 651.957	79
Mercedes-Benz	V-Klasse	447	2014–2019	136–190 PS (100–140 kW)	651.950	256
Mercedes-Benz	Vito	447	2014–2019	136–190 PS (100–140 kW)	651.950	114
Mercedes-Benz	X-Klasse	470	2018–2020	258 PS (190 kW)	642	4

In detail

Conductor plate and speed sensor failure

Symptoms. Shifting faults at first, then limp mode. The car slips between 1st and 2nd, then stays in 2nd with a top speed of about 48 km/h (30 mph). It can get stuck in 2nd when pulling away. The check-engine light may come on, with jolting and erratic shifts. Speed sensor codes are P0717, P0718, P0722 and P0793.

Cause. The speed sensors sit in the conductor plate, the electronic board in the oil bath. The sensors cannot be replaced alone. Heat wears the board: solder joints fail when the oil stays above about 120 C for long, and the board does not like sustained heat above about 110 C.

Which cars. All 722.9 cars. Early units from 2004 to 2008 failed more often. The garage reports name the W204, W211, W212, W221, GLK and Vito.

Fix. Replace the conductor plate. A new plate must be coded to the car's VIN (SCN coding) by a dealer or authorised shop, and a donor unit must be prepared first.

Revised parts. Early 2004 to 2007 units (VGS1) need the valve body replaced with the plate. Later units (VGS2 and VGS3) need the plate alone. The change follows the build date, not the model year.

Cost. Russia: control board assembly about 850 EUR (2019 press article).

Sources: Mercedes Medic, 722.9 problems and solutions, Kfz-Meisterbetrieb Dietrich, 722.9 problems, The Autopian, what a conductor plate is, Kolesa.ru, CLS review

Torque converter lock-up clutch judder

Symptoms. A judder or shudder between 2nd and 3rd gear, most often at higher mileage. A jerk when the lock-up engages, a vibration under light acceleration, and a hum. The car may shudder at a steady low speed, often in one speed window.

Cause. The lock-up clutch lining wears, faster with aggressive driving. Debris from the wear clogs the solenoids. A worn release valve lets the converter release slowly, which gives uneven creep at low speed. Heavy wear can spread metal through the whole gearbox.

Which cars. All 722.9 cars. The Plus built from 04/2011 to 02/2012 with OM651, OM642 or M278 engines has a Daimler bulletin for this fault (see Recalls).

Fix. Overhaul or replace the torque converter. If the lock-up clutch is badly damaged, the gearbox is replaced with the converter. An oil change alone rarely fixes a lock-up slip above 200,000 km.

Sources: Kfz-Meisterbetrieb Dietrich, 722.9 judder, PMM, inside the 7G-Tronic TCU, Mercedes-Benz bulletin LI27.20-P-055758, mirror, Vehicle Service Pros, magnetic clue service note

Valve body and clutch pack wear

Symptoms. Pressure drifts, shown by XENTRY as deviations above about 0.5 bar. A hard jerk on 3 to 2 and 2 to 1 downshifts. A harsh 4 to 5 shift, a delayed engagement, or no forward gear engaging. In the worst case the K3 clutch fails.

Cause. Wear debris from the clutches blocks the solenoids and valve channels. Oil can reach about 130 C, and above that the control unit cuts torque and shift frequency. Hot oil also ages the board.

Which cars. All 722.9 cars. Deposits and pressure deviations usually show from 100,000 to 180,000 km.

Fix. Overhaul the valve body with new spools, bores to nominal size and new seals. If a channel cannot be repaired, replace the whole valve body. After a swap the car needs SCN coding and adaptation with XENTRY.

Cost. Russia: complete mechatronic assembly 1,500 to 1,700 EUR (2019 press article).

Sources: Kfz-Meisterbetrieb Dietrich, 722.9 problems, Kfz-Meisterbetrieb Dietrich, 722.9 jerks, DRIVE2, ZFCENTER logbook, Kolesa.ru, CLS review

Old fluid and missed adaptation reset

Symptoms. Harsh or jerky shifts, often from 80,000 km on. A jerk on 3 to 2 and 2 to 1 downshifts is typical.

Cause. Old or dirty fluid, which lets debris block the solenoids. The oil pump loses pressure if the oil is not changed, by about 90,000 km. The hydraulic block is sensitive to oil cleanliness. Adaptation values drift after a long standstill or an oil change with no reset. The oil pump itself can fail at about 160,000 km.

Which cars. All 722.9 cars.

Fix. A dynamic flush with the right fluid, then an adaptation reset of the shift and lock-up values with XENTRY, then an adaptation drive. A plain drain leaves 40 to 60 percent of the old oil in the box.

Cost. Austria: gearbox flush with new fluid about 600 EUR (2022 article).

Sources: Kfz-Meisterbetrieb Dietrich, 7G-Tronic flush, Kolesa.ru, W204 review, Auto.ru, W205 review, AutoScout24 Austria, 7G-Tronic Plus

Recalls

Country	Code	Years	What is done
Mercedes-Benz service bulletin	LI27.20-P-055758	Built 04/2011 to 02/2012	Service bulletin on lock-up clutch fault codes FC 2783 and FC 0741. Check it with a dealer by VIN.

Maintenance

Fluid. Early 7G-Tronic: MB 236.14, red. 7G-Tronic Plus, from mid-2010: MB 236.15, blue. The Plus has option code A89 and gearbox serial numbers from 2834527 up. The two fluids are not compatible. A wrong fluid must be drained and flushed at once.
Interval. Mercedes' plans run from 40,000 km to 125,000 km or 5 years, depending on the model and use. Towing needs the shorter end. Garages advise 40,000 to 80,000 km.
After a service. Reset and relearn the adaptation values with XENTRY, or the shifts can stay harsh.