hi guys,

i have a w203 sport 7spd automatic. i was driving my car yesterday on local street, and for some reason, the transmission didn't want to upshift or downshift to the next gear. i had a hard time accelerating and once I got to about 40 mph, my transmission wouldn’t upshift to another gear. I tried it shift it manually to D- or D+, still no difference. I had to pull over and restart my car for everything to go back to normal. Please help!

 

I'm not sure if the 7G trans has shifting probs.

 

If a reboot fixed it I would just watch it. TCU's suffer these maladies from time to time.

 

yeah, sounds like temporary limp mode

 

^^^That's what I was thinking.

 

is there anyway i can just reboot the tcu besides restarting the car?? i drove the car today and it happened again. would doing a transmission flush help?

 

wow it happened again i would check it out something is wrong. how is you battery i know that the w203's due wired stuff when they don't have good batterys.

 

A transmission flush isn't gonna help a situation like this - it can't hurt, however. Something weird going on with the TCU it seems. Are you past warranty? You could always call Roadside assistance when it does it and see what they have to say. I've never heard of this happening before on this forum.

 

i havent changed the battery ever since i bought the car. and im passed warrenty. im going to bring it in this fri and see what they say. i hope it wouldnt cost me an arm and a leg.

 

maybe some sort of sensor? Keep in mind tranmissions use pressure to change gears. I had a tranmission shifting problem which was due to a bad mass airflow sensor.

 

did you check if you have fluid in your transmission? by using a special tool dipstick from dealer.

 

did u install after market hid's?


reason why i asked is because this happened to me. i installed some sheap brand hid's back in the day and at times when it would flicker. errors pop up. and there would be times that the car would not shift. i would have to turn it of and then restart. it would be fine after that. then it would slightly flick again. and again same thing. i said **** it. so i disconnected it and drove home with my fogs..

 

yes i did install after market hid, i been driving with the same hid for almost 2yrs, nothing happened until a few days ago. hummm.....

how is your car running now?

 

Yeah i would check the battery level and tranny fluid level. Transmissions are sensitive to those two things.

 

Did you see my separate thread posted to you. I'm having trouble answering this thread

 

its running great now. i have 108000 mile on my car already. still running great. i have a check engine light but nothing seems to be going wrong. i just think it muight be my o2 sensor

 

ic.. my check engine light came on, but it went away. do you currently have aftermarket hid on ur car?