trans shifting issues
Thread Starter
MBWorld Fanatic!
Joined: Jun 2006
Posts: 6,649
Likes: 207
'03 E55, Range Rover Sport Supercharged, Ducati 748R
trans shifting issues
when driving in sport mode sometimes i'll manually downshift and noticed recently that the trans wouldn't hold the gear and shift right back up as if it was still in "d". so i pushed the mode selector button and it would only toggle between "s" and "c" mode with no option for "m"!
it will do this intermittently during every drive. any ideas?
it will do this intermittently during every drive. any ideas?
MBWorld Fanatic!
Joined: Oct 2009
Posts: 2,825
Likes: 17
From: Southern California
E55 w/ goods, Z32 Project underway
Any codes? The trans will push a code to the trans module which then will send a error code to the primary ECU. Something is not right though.
Any leaks, fluid level, recent trans service? Common issue is a leaking electrical socket located on the trans. It can leak, then in no time send trans fluid straight up into the trans module located under the passenger footwell causing issues requiring removal and a thorough cleaning.
Any leaks, fluid level, recent trans service? Common issue is a leaking electrical socket located on the trans. It can leak, then in no time send trans fluid straight up into the trans module located under the passenger footwell causing issues requiring removal and a thorough cleaning.
Last edited by pearlpower; Sep 30, 2011 at 09:12 PM.
SPONSOR
Joined: Jul 2007
Posts: 5,459
Likes: 152
From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati
Eurocharged Performance ML63 and TT lambo
Thread Starter
MBWorld Fanatic!
Joined: Jun 2006
Posts: 6,649
Likes: 207
'03 E55, Range Rover Sport Supercharged, Ducati 748R
just an update and fyi. this was the result of a bad engine oil temp sensor. if the trans thinks the engine oil is too hot it will lock you out of manual mode.
Former Vendor of MBWorld
iTrader: (1)
Joined: May 2008
Posts: 12,139
Likes: 295
From: Houston
2003 W211 E55, 2003 W220 S600
very interesting! How did you find out the engine temp sensor was the problem. Is the oil temp sensor built into the oil level sensor?
Trending Topics
MBWorld Fanatic!
Joined: Jun 2010
Posts: 4,173
Likes: 7
From: Puerto Rico
2005 E55 AMG
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Thread Starter
MBWorld Fanatic!
Joined: Jun 2006
Posts: 6,649
Likes: 207
'03 E55, Range Rover Sport Supercharged, Ducati 748R
Super Member
Joined: Mar 2009
Posts: 937
Likes: 15
From: Alpharetta Georgia
2006 E55, 2006 saab 93 aero, 2010 glk 4m
Too bad I just saw this thread else I could have helped out as I went through this a year ago with a bad Oil level sensor(i'm assuming the same sensor unit measures the temp). Argued with the master tech for almost a week about this issue but he kept on giving me the "its supposed to work that way since its not a manual transmission...". The issue went away after I had them fix my oil level sensor because of random readings and messages. Eventually it made sense because the whole point seemed to be to keep the Engine RPMs low by using of the transmission. Mine would jump from M mode to sport D. Glad you got this resolved. Can be a scary thing when the car shifts gears and launches forward in traffic.
Thread Starter
MBWorld Fanatic!
Joined: Jun 2006
Posts: 6,649
Likes: 207
'03 E55, Range Rover Sport Supercharged, Ducati 748R
Too bad I just saw this thread else I could have helped out as I went through this a year ago with a bad Oil level sensor(i'm assuming the same sensor unit measures the temp). Argued with the master tech for almost a week about this issue but he kept on giving me the "its supposed to work that way since its not a manual transmission...". The issue went away after I had them fix my oil level sensor because of random readings and messages. Eventually it made sense because the whole point seemed to be to keep the Engine RPMs low by using of the transmission. Mine would jump from M mode to sport D. Glad you got this resolved. Can be a scary thing when the car shifts gears and launches forward in traffic.
