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Old 03-04-2020, 09:46 AM   #21
HarleyRob
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Quote:
Originally Posted by OURMANDAN View Post
Thanks for the reply HarleyRob,

Your friend's discovery is an important result segways into a pattern I'm noticing. I will soon post a little write up. But let me ask you ; How are you defining limp mode? I thought it meant "limping the car home" , but MrMCar says that's not what it means. If that's the case then I'll call it "governed mode". When you say limp mode, Did your mean the car suddenly went to between 600 and 1100 RPM and bounced quickly between these 2 limits until you restarted the car?
Yes, in my case, referring to it as "governed mode" may be more accurate. I too have thought it meant "limping the car home". My situation was that the car would only have slow acceleration (as in "stuck in 4th gear) when starting from a stopped position. I never experienced any of the "bouncing" of RPM's. It didn't matter if you shut the car off, the car would not come out of limp/governed mode.
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Old 03-04-2020, 10:04 AM   #22
BobC63
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I think that the 'activators' for limp mode are several / many. I have only had it happen twice (once accidentally and then once 'on purpose') and it had nothing to do with conventional engine or transmission issues...

In my case, limp mode activated because I cranked up a 1400 watt sub-woofer full blast and then sat idling at a stop light for about a minute. Didn't understand why the 'cog of death' had lit up. When the light turned green, I attempted to accelerate normally - and you know the rest. Turned off the stereo and sub amp, limped back home, shut off the car and sat in my driveway for a few minutes; puzzled and wondering what just broke on the vehicle.

Restarted the car, and - voila! - limp mode gone.

Thought about it overnight, remembered the situation with the sub turned up full max, and thought I would experiment to see if I could duplicate the problem.

Sure enough, limp mode again. But only when the vehicle was idling at a stop, auto trans in "D"... if the car was parked, or if the car was cruising at normal speed, no limp mode. Figured out that the combination of lower engine rpm while stopped with transmission in gear (vs. simply idling in 'park') and the draw of the fully powered sub amp was too much for the alternator. Output voltage and / or amperage dropped below a certain level and, apparently effected the cars electronics elsewhere. Made the ECM "thinK" that there was a problem in the drivetrain, and activate the limp mode response.

So it is possible that your limp mode turns on and there is actually nothing permanently 'wrong' with the vehicle.
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Old 03-04-2020, 04:26 PM   #23
TobyB
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5 speed manual = no limp mode.

Simple!

heh

t
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Old 03-05-2020, 08:15 PM   #24
aluarca
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Originally Posted by BaliDawg View Post
For anyone wanting to know how these E46 automatic transmissions work, read this.
http://v12.dyndns.org/BMW/BMW%203%20...mission%20.pdf

I have most of the tech docs for both the GM 5L40E and ZF 5HP19 on my Google drive.
PM me your GMAIL address if you want a download link.
I am interested in those Docs, can I email you my gmail as well?

Thanks

Currently my GM transmission is leaking oil from the electric connector going into the tranny. I want to gather as much info on it as I can. Great thread hope we get a ton of info.
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Old 03-05-2020, 08:55 PM   #25
BaliDawg
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I am interested in those Docs, can I email you my gmail as well?
Yes. Send me a PM (private message) with your GMAIL address and I’ll share the GM folder.
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Old 03-06-2020, 06:03 PM   #26
aluarca
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Yes. Send me a PM (private message) with your GMAIL address and I’ll share the GM folder.
Really appreciate it. PM sent
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Old 03-06-2020, 06:41 PM   #27
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Really appreciate it. PM sent
Docs shared. They’re all out there on the Internet, I’ve just collected them up over the years.
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Old 03-06-2020, 09:14 PM   #28
aluarca
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Docs shared. They’re all out there on the Internet, I’ve just collected them up over the years.
Fun time learning about the tranny. Thanks a lot!!!!
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Old 03-09-2020, 09:32 PM   #29
darkfires102
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Limp mode basically does not exist on manual transmission cars- the limp mode many talk about is the cog of death for auto trans users...The EML light will also trigger a limp mode..but a failure tripping the EML is very rare.
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