only have 3rd gear in 4L60E
Thread Starter
TECH Apprentice
Joined: Jun 2009
Posts: 370
Likes: 0
From: Garland, TX
only have 3rd gear in 4L60E I have recently had a new rebuilt trans and yank 4000ss installed in car. Everything was fine until today.
Feels like the car only has drive. It is not starting off in low gear like normal.
reverse works
The torque converter is no longer locking up either.
If anyone has any knowledge about this, send it please.
I could only find threads where 3rd and 4th was lost.
Feels like the car only has drive. It is not starting off in low gear like normal.
reverse works
The torque converter is no longer locking up either.
If anyone has any knowledge about this, send it please.
I could only find threads where 3rd and 4th was lost.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
If you only have 3rd gear then the trans is in "limp" mode. Scan for codes, that should tell you why it is in limp mode.
Did you have the PCM tuned for the Yank stall? If not, that is why you are in limp mode - the PCM has detected too much slippage and forced limp mode.
Did you have the PCM tuned for the Yank stall? If not, that is why you are in limp mode - the PCM has detected too much slippage and forced limp mode.
Thread Starter
TECH Apprentice
Joined: Jun 2009
Posts: 370
Likes: 0
From: Garland, TX
If you only have 3rd gear then the trans is in "limp" mode. Scan for codes, that should tell you why it is in limp mode.
Did you have the PCM tuned for the Yank stall? If not, that is why you are in limp mode - the PCM has detected too much slippage and forced limp mode.
Did you have the PCM tuned for the Yank stall? If not, that is why you are in limp mode - the PCM has detected too much slippage and forced limp mode.
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Because the PCM detects slippage due to the difference in engine rpm and vehicle speed. It's common with converters over 3500. When I went from a 3000 stall to 3600 I had the problem. Had to tune out several DTC's to keep it from happening.
Do a search on "limp mode" on this forum and you'll get all the info on the codes to tune out - I can't remember them now.
Do a search on "limp mode" on this forum and you'll get all the info on the codes to tune out - I can't remember them now.
Mine would only do it when it upshifted on a hill and the rpm didn't drop at all, sent it to limp mode.
If it happens you should be able to pull over, turn the key off for 15-20 seconds, then restart the car. You will want to get the codes tuned out though so it doesn't happen.
If it happens you should be able to pull over, turn the key off for 15-20 seconds, then restart the car. You will want to get the codes tuned out though so it doesn't happen.
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Verdad Gallardo Moderator
Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
As was mentioned, when the PCM detects too much slippage it enters limp mode. Just turning off the engine resets it and it is hard to predict when it will happen again. Best to get it tuned for a high stall converter - the tune will disable a few codes and reduce the sensitivity of the misfire table.
As was mentioned, when the PCM detects too much slippage it enters limp mode. Just turning off the engine resets it and it is hard to predict when it will happen again. Best to get it tuned for a high stall converter - the tune will disable a few codes and reduce the sensitivity of the misfire table.
Thread Starter
TECH Apprentice
Joined: Jun 2009
Posts: 370
Likes: 0
From: Garland, TX
thank you all for replying. I am going to schedule to get it tuned.
