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A Couple of Months ago 1 of My Transmission Shift Solenoids Went Out on my 2003 E320 Base Model Gasoline Sedan , I Replaced all Solenoids and Conductor Board with a High Performance Kit From FCP Euro In The Video Below .
Once in The Car I Took it for a Test Drive and it shifted Between 1-3 Fine But when I Go To Accelerate above 50mph The Car Goes into Limp Mode and Won't Shift above 2nd Gear It Gives me a P0730 Code at The General Scan and a P2503 At The Transmission Scan (See Pics) I Have Tried Everything Including changing The Throttle Position Sensor/Gas Pedal Assembly and Nothing Works Can anyone Help ?
It sounds like your 2003 E320 is throwing quite the transmission tantrum! Those symptoms you’re describing, especially with the solenoids failing and the limp mode kicking in above 50 mph, are definitely red flags. Error codes P0730 and P2503 suggest there might be issues with the transmission's gear ratio and power supply, respectively.
Considering you’ve already installed a performance kit, it’s possible that the modifications could be affecting the transmission’s behavior. I’d recommend double-checking the installation to ensure everything is connected properly and that there’s no interference with the solenoids. Also, if you haven't already, it might be worth resetting the transmission adaptation values after making changes. Your scanner in the pics I don't think does that, but I have youcanic scanner and it can do it. If the problem persists, you might need to look into replacing the solenoids or even a transmission fluid flush to clear any debris. Good luck, and keep us updated on what you find!
would you consider returning the original solenoids since the high performance solenoids should only be used if the transmission is tuned for it (the video mentions this!)?
i personally would be leery of changing adaptation values (pretty sure your Launch scanner can do this) if the trans was working fine before.
thinking outside the box, how are the rear tires? are they evenly wearing? my thought is if there is some differential change due to variance in tire size possibly causing this issue? this is a conjecture.
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