4l60e limp mode pls help

mike · CAMBRIDGE, ONT

4l60e limp mode pls help

saefifty · PORT PERRY, ONT

Sounds like he foamed the fluid and now the trans is slipping...That would be the slip home mode.

fatstax · COBOURG, ONT

94 4l60? wouldn't it be a 700 r4 still? I put a 700 r in a 93 for my buddies son awhile ago, unless 94 was the changeover year

mike · CAMBRIDGE, ONT

No I think they changed it in 1992 and it is electronic shift 700r4 Wasent as far I know

mike · CAMBRIDGE, ONT

Could be up till 93 tho

mike · CAMBRIDGE, ONT

And I how do I get it out of slip

fatstax · COBOURG, ONT

sorry but I don't believe it has such a mode as you describe, its slipping cause its screwed.

MANCAVER · info@mancavestuff.ca

any speed sensors on the tranny that could be pooched?

mike · CAMBRIDGE, ONT

All the info I can find says that when the transmission has to little or to much fluid or has a screwed shift solenoid the the pcm puts the transmission in limp mode basicly it stays in 2 gear but nothing to describe how to get it out it could very well be something else and it could be screwed that's just the info I've been able to find in the last couple days and was hoping someone would know what to do

DaveM · ONTARIO

Limp mode is in the PCM. It is not happy with the electrical system in the tranny. Either power loss, open solenoid circuits or shorts etc. In limp mode the trans will still work but on a reduced level, usually reverse and 3rd will work, and line pressure will be at max. It should not slip. and the only way to recover is to fix the electrical problem. But again, limp mode will not cause the trans to slip.

mike · CAMBRIDGE, ONT

Ok cool now I understand what exactly the limp mode does and that it does exist and not something just made up somwere. But what else could it be it was running perfectly fine before he dumped the fluid in he said it got a bit low so put some in and over filled it now it has no balls to it at all it will still move just massively reduced power and I did drain the fluid and put it back to proper level there was also no chucks or debris sitting in the pan and there Wasent much sediment eather

hemi43 · ONTARIO

Its has reduced power, because it's trying to move in high gear. It's supposed to do this in limp mode. I sent you a PM.

mike · CAMBRIDGE, ONT

Thanks

MANCAVER · info@mancavestuff.ca

be sure to report back when you find the solution.

just curious, is your speedometer working?

mike · CAMBRIDGE, ONT

Will do

mike · CAMBRIDGE, ONT

And yes it is

saefifty · PORT PERRY, ONT

Likely the overfill whipped and foamed the fluid that I think would drop pressure and the sensors would command limp mode.I think its second gear it goes in.Thing is clearing the codes and using a scanner to reset I believe is the plan...They say unhooking the battery ground will reset but it didnt work for me.........

saefifty · PORT PERRY, ONT

Check all the fuses ..VSS could cause this i think.....

mike · CAMBRIDGE, ONT

Ya fuses was one of the first things I checked. I hate being the dumbass who trys 100 different thing only to realize it was a blown fuse all along lol. And unpluging the battery ain't working for me eather

-- Edited by mike on Friday 25th of April 2014 09:19:58 AM

mike · CAMBRIDGE, ONT

Got an older scanner today will let you guys know how it goes tonight

poncho62 · ADMINISTRATOR

mike wrote:
Got an older scanner today will let you guys know how it goes tonight

I thought the only way to reset OBD1 was to cut power for a while...Would be interested in this fix too, just for interest

fatchuk · ST MARYS, ONTARIO

If and when you get a code post that information ..Also what engine in it.. and there seems to something missing in this story..Why did he put fluid in it in the first place and especialy enough to over fill as much as your sayin..what was happening that he had to fill it..This problem could have been there before he overfilled it..did he have the pan off to change the filter?? did he get that filter back on right ...I have observed many guys do this and not get that o-ring out of the bore and then not get the filter installed correctly..did he move, pinch, break, any wires on the shift solenoides if he had the pan off..need more information to help you..These had lots of interal problems in the early 460 or 480 but, the 480 was much tougher ..kinda like the turbo 400, the 480 had much heavier hard parts..and one thing I remember having problems with was the plug on the side of those ..If for any reason he pulled that plug off he could have broken a pin ..Those plugs are glued on you must use a heat gun to remove them..if you don't most likely you damage the plug..so check that plug and while your at it check the harness for any pinched wires runing over the case up to the tcm..it is hard to help if you do not tell the whole story..we need the facts...

-- Edited by fatchuk on Friday 25th of April 2014 06:55:35 PM

saefifty · PORT PERRY, ONT

Fatchuck is right for some reason people add fluid when they have trans issues.Somehow they think overfilling mite fix it?Im thinking there was a trans issue before he overfilled it.An unnamed oil change place across the road from our shop regularly messed up shift solenoids doing trans services..Im thinking you only have some of the story..

mike · CAMBRIDGE, ONT

Ok to the best what I got for info he said fluid seemed low so he added some to it and not paying attention dumped way to much in not knowing how to get the fluid back out he drove it thinking it did not matter obviously he was wrong and he ended up having to call a tow truck and brought it over to my place I syringed the extra fluid out but it still had the issue even after I unplugged the battery so I dropped the pan to see if anything was floating around in the pan that shouldent be I also checked the solenoids both had 21 ohmes and harnesses were intacked I was told I would need to hook it up to a scanner to see what the acuall issue is so I did so and got nothing. Hemi43 gave me a number to contact for a transmission guy when I called him and explained what happen to him he said once the transmission was filled to full and drivin the fluid would have foamed and this the clutch packs and they would need to be replaced and that even on the scanner that damage wouldent show up at this point it's a 1994 blazzer he picked up under a 1000 bucks and has decided not to fix the transmission and is buying another vehicle do to what it would cost to fix it

mike · CAMBRIDGE, ONT

By the way Hemi43 thanks for the contact he was very helpfull

mike · CAMBRIDGE, ONT

And the transmission is bolted up to. 350 and is also 4x4

slim · DUNDAS, ONT

Thanks for letting us know what happened. Never would've guessed that to much oil would burn up the clutch packs .

MANCAVER · info@mancavestuff.ca

20 year old tranny in a throw-away-truck. Clutch packs could have been mostly pooched anyway. Maybe that's why he added fluid because it was acting up.

mike · CAMBRIDGE, ONT

Ya would have never known Eather

saefifty · PORT PERRY, ONT

Thanks for the follow up...Nice to know what ended..

Hog · WOODSTOCK, ONT

1992 was the last year of the 700R4/4l60e in the fullsize GMT trucks, then went to 4l60e for MY1993.
1993 was the last year for 700R4/4l60 in the F-bodies(Camaro/Firebirds) and Y body Vettes.

If you remove power from a 4l60e the trans will default to 3rd gear. If you place a 4l60e in 2nd gear using the gear selector, the trans will start from a dead stop in 2nd gear. This is designed to apply less torque to the drive wheels in snow/ice conditions.

4l80e replaced the 3l80/400 3 speed trans for MY1991 in the trucks. 1990 454SS was 230hp/385 lb/ft torque with 3 speed 3l80e/400 trans and 14 bolt 9.5" SF rearend with 3.73 gears.
1991-93 454SS got 255hp/405lb/ft torque with the 4 speed electronic OD trans, 14 bolt 9.5SF rear with 4.10 gears. If you remove the power from a 4l80E trans the trans will default to 2nd gear.
I