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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-16-2014, 12:36 PM   #1
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Join Date: Jan 2011
Location: Casa Grande Arizona
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My Ride: 05 325ci
Cog of Death,, Tranny fail-safe mode - Recommendations?

Hi guys,, On Monday I got the love cog of death while driving home. Had to limp it back and then limped it to the local BMW dealer to find out whats wrong.

Here's my car info

2005 325ci
143k miles
Auto Trans

The tech did a diagnostic and didnt find any errors, but recommended I replace my transmission at $5400. Uhh,, what????? He reset the fail safe and I drove it home with no issues.

So what do you guys reccommed? I know when you get the cog of death it could be a millions things that could have gone wrong. Bad tranny, Bad battery, Bad sensor, the list goes on.. What do you guys think I should do?

I love my car, and other than a fuel pump replacement and regular maintenance, the car has been rock solid.
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Old 07-18-2014, 11:32 AM   #2
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Join Date: Jun 2013
Location: LA or OC
Posts: 2,443
My Ride: used to be an auto
Uh what the hell. 'I dont know what it is, so let me quote you the most expensive thing i can think of'. Burn in hell mechanic. Check your MAF first. Caused the gear light on mine.
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Old 08-13-2014, 02:10 PM   #3
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Location: Chicago, il
Posts: 34
My Ride: 2000 328ci
Had the same thing on mine, turned out camshaft sensors were/were going bad. Changed the MAF sensor, it went away, for a little, then it happened one more time and I changed the fuel filter and it all went away...
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Old 09-23-2014, 01:46 AM   #4
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My Ride: 2001 330ci
did this get fixed? my car kept going into fail
safe because of a bad battery that didnt hold a full charge.
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Old 09-26-2014, 01:27 AM   #5
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Location: gross deutsches reich USA
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My Ride: 323i with S54
mechanic checked via generic OBD2 scanner, showed nothing. That is because he needs to scan BMW factory, codes, it will say why the transmission is in safe mode.
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