Mercedes-Benz.
Mercedes builds its own automatics, and Malaysia is full of the 7G-Tronic (722.9) — a gearbox with one famous weak point: the conductor plate inside the valve body. Its symptoms (limp mode, missing gears, speed-sensor faults) terrify owners, but for a specialist it's routine, well-documented work.
C-Class · E-Class · GLC · A-Class · CLA · GLA
What's fitted
| Unit | Type | Found in | Specialist note |
|---|---|---|---|
| 7G-Tronic (722.9) | Conventional automatic | C-Class W204/W205, E-Class W212, GLC | Conductor plate and valve body are the known service items; the mechanical core is strong. |
| 9G-Tronic (725.0) | Conventional automatic | W205 facelift, W213 E-Class, newer GLC | Excellent unit; strict fluid specification, unforgiving of wrong oil. |
| 7G-DCT (724.0) | Dual-clutch | A-Class, CLA, GLA | Wet-clutch DCT; juddery low-speed behaviour usually traces to fluid or clutch adaptation. |
Known failure modes
Fault 01
Limp mode / stuck in one gear (722.9)
The classic conductor-plate failure — internal speed sensors die and the gearbox protects itself. Repairable at component level without replacing the gearbox.
Fault 02
Harsh 2–3 shift or flare
Valve-body wear or degraded fluid on higher-mileage 7G units. A rebuild of the valve body restores factory shift quality.
Fault 03
A-Class/CLA judder in traffic
7G-DCT clutch judder, aggravated by heat and old fluid. Fluid service and adaptation first; clutch pack if wear is confirmed.
Cost band · Malaysia
RM 500 (diagnosis) to RM 11,000+ (full overhaul); conductor plate typically RM 2,500–4,000
Exact pricing depends on the diagnosis — see the full 2026 cost guide for how quotes are built and the questions that keep them honest.
Mercedes-Benz owners ask
- 01My W204 is stuck in limp mode. Do I need a new gearbox?
- Almost certainly not. Limp mode on the 722.9 is most commonly the conductor plate — a known, repairable fault. A specialist scan reads the internal sensor codes and confirms it in minutes.