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post #11 of 15 Old 21st July 2016, 03:09 AM Thread Starter
ToneM5
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FmL now itll go into gear and will move but its slipping it has no power take it to bmw to fix and it only comes out worse.

After repair i will need to get into a warranty that covers smg parts as well bought the car in december the dealer said they couldnt warranty it 08 m5 with 46000 miles
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post #12 of 15 Old 21st July 2016, 01:40 PM
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Prestige in new jersey by far the worst ones i've ever dealt with in my life, after the repair the same symptoms return, takes them a week and a half to diagnose that the "new problem" is the transmission control module
SMG Modules don't go bad. Period. If they did, I wouldn't have 15 of them I've been trying to sell for over a year.

SMG troubleshooting sequence should always start with testing the battery on a load tester, then verifying alternator output for both DC and AC (verifies a diode isn't blown). In your case, this is especially true as you have some odd other errors along with it. Low voltage means low torque output from SMG pump motor, therefore undershooting pressure range and running more frequently to maintain it.

After that, SMG pump relay isn't a bad start, but as mentioned it's a $5 part with 15minutes of labor to replace.

Finally, given the SMG pressure problem, the SMG hydraulic pump motor itself is a common failure. This is a typical brushed DC motor design and over time, the brushes wear out, carbon dust builds up internally and provides a parallel path for current that should be going to the armature windings. $300 part, 4 hours labor.

Not sure geography wise how close you are but @M5 daemon daemon runs a shop, M-chanics, in Valley Stream, NY and is one of the most competent techs in the country for this car and transmission.

Last edited by jcolley; 21st July 2016 at 01:41 PM.
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post #13 of 15 Old 21st July 2016, 01:58 PM Thread Starter
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I brought it to another euro shop that just told me the same exact thing you did about the module, except he said with the symptoms its showing it could be a crankshaft position sensor, anyway im going to try and get to the bottom of this, valley stream is about an hour and half away thanks for the input i will go to them next
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post #14 of 15 Old 21st July 2016, 01:58 PM Thread Starter
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I brought it to another euro shop that just told me the same exact thing you did about the module, except he said with the symptoms its showing it could be a crankshaft position sensor, anyway im going to try and get to the bottom of this, valley stream is about an hour and half away thanks for the input i will go to them next
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post #15 of 15 Old 21st July 2016, 02:00 PM Thread Starter
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Originally Posted by ToneM5 View Post
Prestige in new jersey by far the worst ones i've ever dealt with in my life, after the repair the same symptoms return, takes them a week and a half to diagnose that the "new problem" is the transmission control module
SMG Modules don't go bad. Period. If they did, I wouldn't have 15 of them I've been trying to sell for over a year.

SMG troubleshooting sequence should always start with testing the battery on a load tester, then verifying alternator output for both DC and AC (verifies a diode isn't blown). In your case, this is especially true as you have some odd other errors along with it. Low voltage means low torque output from SMG pump motor, therefore undershooting pressure range and running more frequently to maintain it.

After that, SMG pump relay isn't a bad start, but as mentioned it's a $5 part with 15minutes of labor to replace.

Finally, given the SMG pressure problem, the SMG hydraulic pump motor itself is a common failure. This is a typical brushed DC motor design and over time, the brushes wear out, carbon dust builds up internally and provides a parallel path for current that should be going to the armature windings. $300 part, 4 hours labor.

Not sure geography wise how close you are but @M5 daemon daemon runs a shop, M-chanics, in Valley Stream, NY and is one of the most competent techs in the country for this car and transmission.

Also the relay was just recently changed by the dealership im going to look into your scenario i hope thats what it is lol and nothing crazy
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