trans shifting issues
09-30-2011, 08:04 PM
#1
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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?
09-30-2011, 09:00 PM
#2
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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; 09-30-2011 at 09:12 PM.
10-27-2011, 03:35 AM
#5
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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.
10-27-2011, 08:18 AM
#7
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10-27-2011, 04:36 PM
#10
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10-27-2011, 05:12 PM
#11
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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.
10-27-2011, 05:21 PM
#12
MBWorld Fanatic!
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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.
