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Old 04-19-2007, 04:18 PM
shocky111 shocky111 is offline
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limp mode

What puts the tranny in limp mode? What happens while in limp mode? Is damage being done? 2004 6.0, torque shift tranny.

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Old 04-19-2007, 08:45 PM
Joms Joms is offline
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Never heard of 'limp' mode before...
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Old 04-19-2007, 10:08 PM
shocky111 shocky111 is offline
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well stay tuned then...we're both about to learn a thing or two...I hope.

FYI...torque converter wont allow tranny to shift because of an over torque situation. Common with tuners.
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Old 04-20-2007, 08:09 AM
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Quote:
Originally Posted by shocky111
FYI...torque converter wont allow tranny to shift because of an over torque situation. Common with tuners.
FYI the torque converter has no control over the trans. When the PCM tells the trans to shift, the torque converter can't prevent the shift.

Limp home mode is when the PCM detects a severe transmission problem. The PCM limits the transmission operation to try and prevent damage. A lot of people say that limp home is only a certain gear, but that isn't correct. The PCM decides what the trans can still do with the failure that it has, and uses what is still useable.

An example of limp home would be if the PCM detected that the pressure control solenoid that operates the overdrive clutch didn't work. In that case 2nd and 5th gears wouldn't work, so the trans will shift 1-3-4, since that's all that it can do.
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Old 04-20-2007, 08:49 AM
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I've never heard of a Torque shift going into or having a limp mode. The Allison trany (witnessed a 2002 DMax in limp mode) has a limp mode and it will go into limp mode with a tuner and a moderate to heavy load. It is controlled by the TCM and not the torque converter... Then again I could be wrong. I'm sure some one will correct me if I am.
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Old 04-20-2007, 10:12 AM
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The motor will go into limp-mode when certain operating parameters are met (not sure how the tranny is affected). For example, with cooling issues, it will not allow the motor over a certain RPM.

Hopefully, one of the techs will chime in, but I bet a search of "limp mode" will turn up something here or on the net. I know the motor has it, just do not know the specifics.
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Old 04-20-2007, 10:16 AM
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Just wish they had come up with a different name. 'Limp Mode' is not a very manly name for something on a diesel....
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Old 04-24-2007, 11:44 AM
cwacaster cwacaster is offline
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My 05 F-250 went into limp mode while driving once. While in limp mode it ran like it was governed at 50mph. The service department at the dealership said it was because the EGR valve was stuck. They replaced the EGR under warranty and I haven't had any more problems.
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Old 04-24-2007, 02:13 PM
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BBC, do you know what year models have this feature?
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Old 04-24-2007, 02:20 PM
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Quote:
Originally Posted by msgtg
BBC, do you know what year models have this feature?
No... but I think all 6.0L motors have it - regardless of model year... its just a feature of the programing and the motor's capabilities (at least with Ford's programming being used in the PCM).
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Old 04-24-2007, 02:47 PM
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K, thanks dude!
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Old 04-24-2007, 04:13 PM
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Earlier Ford trucks had it too...thr tranny was the topic of this post...my '92 F250 would go into "limp home" mode when the vss module went out and also when the fluid level got too low. It would upshift really HARD and the overdrive lamp would blink to tell you it was in "limp home" mode. Codes would also show up when I took it in for repair....Can't really remember what they did...maybe changed fluid. Finally had to have the tranny overhauled - at about 150,000 miles. Never had the problem again.
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Old 04-24-2007, 04:13 PM
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