shlomiel

Hello

I have mercedes C200, MY2006, W203, engine 2.2 CDI, automatic transmission (5 speed, 722.6), 520,000KM on the clock. *No CEL at all.

bought it about 2 months ago.
about a month ago i did some maintenance job: replaced engine oil, engine oil filter, air filter, fuel filter, brake fluid, coolant, injectors gaskets.

the following problems appeared since day 1 i bought it, regardless of this maintenance job,

The problems are:
1. hard shift between 1-2 when cold, barely noticed when the car is hot.
2. RPM shaking in cruise speed driving (for example, driving on 100 km/h highway, the rpm goes up and doun +-150 RPM and not stays on 1700~.

you can see the second problem in this video i took:

I have changed twice (2 weeks ago and 1 week ago) the Transmission oil+internal transmission filter+pan gasket.
Plus, i have changed the 13-pin connector.
but still, it didn't solve the problem.

what would you recommand to do next?
are these a known problems?

I thought to open the drop the pan off, take the valve body out and replace the following:
1. conductor plate (replace in new, genuine conductor plate, about 250$ at the dealer)
2. Lock-Up PWM Solenoid (i suspect this is the source of the shaking rpm in highway)
3. maybe the 1-2/4-5 Shift Solenoid
4. maybe the all 6 solenoids.

I found these updated solenoids parts numbers:

3X A 240 270 02 89 (replaced A 240 270 01 89)
1X A 140 277 04 35
2X A 203 270 00 89 (replaced A 140 277 03 98)

and the pic of the valve body


So what do you think? I would appreciate your assistance.

Plutoe

Be cautious, new part numbers do not always mean the parts have been updated.


Have you used Xentry in road mode to test the transmission---if not do so and post the results.

shlomiel

So after this problem: (shaking rpm at cruise+ahrd shifting between 1-2 gears)

I fixed it by doing the following:
1. drop the pan off (5xT30 bolts and 1 10mm bolt) +remove the filter+took the Valve Body (stamped in 0006) out (9 T30 torx bolts).
2. replaced the Conductor Plate with new genuine part. part # 140 270 1161
3. replaced the Lock-Up PWM Solenoid with another used one. Part # A140 277 00 35
4. install the Valve Body back in.
5. install a new transmission filter (MANN, came together with the pan gasket) part # MANN H 182 KIT
6. install the pan back with a new gasket.
7. fill in 4.2 liters of Castrol Transmax Dexron VI Mercon LV.

see the new video now:

Now, the 1-2 shift is much smoother + no more rpm shaking in cruise.

Ferreiraw203

Hello, how did you know the lock solenoid was bad? Thanks.