New Member with 2000 ML430 - Limp mode issues
Hello, I just joined the forum but am not new to MB ownership; I have owned several W124 and W126 sedans and a R107 many moons ago. I recently purchased a W163 ML430 and enjoy the truck but am still trying to adjust to its variety of electronic quirks.
My main concern is that, on occasion, for what seems to be no reason at all, the transmission will enter 'limp home' mode, i.e. it will not shift out of 2nd gear. This takes place completely at random. Most times when I crank up the vehicle it doesn't happen, but sometimes it does. I have done a little online research and as best I can tell the most common causes include a weak battery, a defective 13 pin connector pilot bearing, or a conductor plate failure.
On one occasion where this took place, the SES light came on, and according to my code scanner it was showing a P0700 code; however my tool is a basic Snap-On model and does not have the capabilities to give me any further information. When I purchased the truck it had an older battery in it, I replaced it with a new one, hoping that quick fix would solve the problem, however I did not see a change. Also, following the battery replacement the BAS/ESP light came on briefly, then went out.
I have ordered a dipstick tool to check on the fluid level, but I would like to know how best to diagnose further in order to determine whether I need to replace the connector, the conductor plate, or something altogether different. Any and all replies are welcomed.
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