This happened twice last night and once today. When the car comes almost to the dead stop at the traffic light less then 5MPH, car jerks. Once the cars in motion again, it will jerk again when the car shifts to 2nd gear then it won't shift to 5th gear and passes 3k RPM and just kept going up!.
I got on the highway last night after this "Jerk" at the red signal almost to a dead stop, followed by 2nd gear jerk and I was going at 60MPH then realized my RPM was above 3K RPM and won't shift to 5th gear. I pulled over to the shoulder, turned off the car, restarted, and the problem disappeared.
It looks like once I turn off the car and re-start, the problem disappears. This has never happened before and started last night Does anyone have any ideas on why? Do you guys think resetting the ECU may do something???? Please help!!
Cars on a "S" Mode. Transmission fluid was changed at 60K and currently milage is 74K.

Dump the codes and post them. The transmission codes will give us a big clue.

no CEL, no warning lights on the dash board.....

I suggest that you take car in and have the transmission fluid level checked. I can almost guarantee that you are a couple quarts low. Have you seen any red fluid from underneath you car when parked overnight? In either case just go to an Indy to have it checked out for a couple bucks. If you do need some like I did the new quarts from MB run 20 bucks a bottle. They are expensive but not when compared to buying a new transmission.

Greg

I recently had transmission fluid oil in my passenger side footwell and it ended up getting into my TCU. I wonder if you might have the same problem, I suspect my transmission problem is because my TCU was exposed to trans fluid which conducts electricity and possibly shorted some of the circuitry.

Checking trans fluid is tough considering no one sells dipstick but a indy shop who knows MB's and has MB tools should be able to check for you as stated above.

Let me know as I have similar symptoms and would like to get this resolved outside the stealership if at all possible.

Well....MB does does actually sell the Transmission Dipstick (must be removed after you check the level) for 58 plus tax. It is not a normally stocked part from what my dealer told me.

I did find this one on Ebay though: http://cgi.ebay.com/ebaymotors/Merce...motiveQ5fTools for 21 plus shipping.

I had to check mine as well because the tranny was shifting late for a while and a week ago it completely came out of gear when I was trying to make a fast pass. I had to pull over and restart the car in order for it to go into gear again. I went straight to an Indy and found that I was 2 quarts low, he replaced it for 40 bucks and the car shifts like normal again. I did find a loose trans line so i tightened it up but now I am wondering if I shouls also do the trans plug / TCU.

Greg

Just got the car back from the shop with $601.00 less in my pocket

Heres is the run down descrptions from the invoice.

"Scan for Shiftting irregularities - Codes stored for Transmission Electrical Shift Plate. Remove & Replace Shift Plate, Renew Fluid, Clear codes & Road Test."

Almot three hour labor with $270.00 for the Transmission Electrical Shift Plate.

Car runs very smooth with absolutely no "Jerk" and gears shift smoothly than before and very responsive

Any idea what "Electrical Shift plate" exactly do? it fixed the issue for me but are there other functions to it? The reason I am asking is because the car feels much more responsive at each gear and shifts very smooth.

If it's part number 1402700861, then it holds the input and output speed sensors. It's gone bad for a few people on this forum.

As long as hey were in there, did the mechanic replace the o-ring for the transmission wiring harness? It would have added about $2 to the bill if they did it while replacing the electronics plate. It costs several hundred if done as a separate job.

forgot to mention, "Replaced Gasket" under the invoice for $12.00. Do you think this gasket is O-ring?

No the O-ring is a seperate part than the transmission gasket. From what I know the O-ring goes on the transmission control unit located on the transmission and accessed from underneath the car. The part only costs 20 something and seems pretty easy to do from other DIY's I have seen. I have yet to see a DIY for a W208 though. The old O-rings are known to leak and then trans fluid will accumulate on the TCU sensor / pins and will cause issues with shifting. I am not sure if it will cause damage to the transmission so hopefully someone smarter can chime in with more info. This is definitely on my list of preventive maintenance to be done especially with 139,000 miles slowing coming up.

Greg

The dealer did the plate and o-ring on my car two summers ago. These are the parts/prices listed on my invoice:

• electronics kit (plate) (part number 140-270-08-61) - $223.45
• transmission pan gasket (part number 140-271-00-80) - $12.00
• seal ring (part number 140-271-00-60) - $2.09
• transmission fluid (part number 001-989-21-03-10) - $14.50 each
• Transmission oil filter (part number 140-277-00-95) - $15.50
• Lock pin (part number 140-991-00-55) - $1.69
• Spacer (part number 203-540-02-53) - $11.02

i replaced that o-ring and sensor as well about 2 years ago. my dad is a Mercedes master tech and as soon as we bought the car he said we had to replace it asap along with some other maintenance stuff. there was some fluid buildup on it. dads rock

My 1999 clk 430 will not shift into gear and can not run over 40 miles an hour without going to 4000rpm, any ideas?