'96 E300 Diesel Check Engine Light P0400-- Car jerks when it shifts gears?
 

I own a '96 E300 Diesel with 240,000 miles and it has been running perfectly. A few weeks ago I had the oil changed, differential fluid changed, the steering fluid flushed and changed and the Coolant flushed and chaged. As soon as i started driving the car once the place finished the job the check engine light came on and the car would shift each gear with a rather violent jerk. I took it back the next day and they checked the codes and came up with a P0400 and P0380 ( p0380 which comes on and off and i have had it checked-- think it might just be a error in the computer) but the p0400 is a new one and it has to do with the EGR Valve. But i didnt have any idea that the EGR valve could affect the transmission. Can anyone help me figure out what might be going on? Thanks and let me know if you need more information!

Check for any disconnected vacuum lines in the engine bay, you may have knocked one off accidentally. Both the modulator for the transmission (adjusts how hard/softly the gearbox shifts gears) and the EGR are vacuum operated so this sounds the most likely.

Do you have or know of any diagrams or photos that show me where these lines are located Im not too educated on where to find these. Id really appreciate it!

https://cimg9.ibsrv.net/gimg/www.mbw...c1fc21e821.jpg
On the front of the engine is a vacuum pump with a large bore plastic pipe leading to the brake booster. Start at the pump, there are some small hoses that attach straight to it and there may also be one that leads from the vacuum hose at the brake booster. Start with these areas.

P0400 on aW210 diesel is a faulty EGR valve pressure transducer!!

But before you are run around the may pole change the filter(95) clear the fault and if the fault returns then its the transducer!!

I checked the lines that i could and i found one with a yellow tip inserted into somewhere else that was pulled out about halfway, i pushed it back in and it shifts completely normally now! Im shocked at how such a small problem can cause something completely unrelated (or so i thought) to act abnormally like the car had been! Thank you! Do you know where i can find a new line to replace since it is 19 years old and would probably prevent it from loosening again if replaced! Ill post a photo of the line i saw loose in a little while!