camarorat

iTrader: (8)

Rebuilt engine and trans and have about 140 miles on each. Was dyno tuned and ran fine except that the car would not idle when it was cold, as soon as it warmed up it ran great, no surge and good idle and shifted great. I was out driving tonight and the SES light came on and the trans would not shift our of 3 gear. It starts from a dead stop in 3rd and won't shift out of it. Got any ideas. Is my new trans shot?

performabuilt

iTrader: (25)

No you are in limp mode. Get the code number and I will tell you what you need to do.
Also is the converter stock?

performabuilt2

makeure the trans is plugged in and there are no fuses blown it is in limp mode the trans reverts to 3rd gear with no power both solenoids off gives third and reverse only

camarorat

iTrader: (8)

Thanks for the info. I am running a vig converter and it's around 3600 stall.I check the fuses and plugs (where are the fuses located) , if that's not it I'll reset it and get a code and drive it over to my friend shop tomorrow to see what code it's throwing.

LS1_K1DD

iTrader: (3)

^Are you running a trans cooler for that higher stall? It could just be getting hot and the computer is going to limp mode to be safe. It feels the tranny is in danger. So it engages into 3rd, pulls timing, and adjusts line pressure to save it. Shut it off, let it cool down, sometimes this works, although your SES light will still be on.

My car does the same thing, but i also don't have a tune. Code may be 0757. Shift solenoid "B" Stuck on. If you aren't running a cooler, i highly advise getting one. And also it wont hurt anything, just don't rod it and stay at a cruising speed.

camarorat

iTrader: (8)

I'm running a cooler. The code is P0757.

BubaGumpShrimp

iTrader: (1)

you just need that code shut off, it relates to excessive slip from the torque converter. The computer thinks that the stock converter is in there and its slipping too much which puts it out of the programmed threshold of what is acceptable amount of slip. Since you change the converer it slips a ton more than a stock one would hence limp mode. Simple to fix it, just have the code shut off and you will be good to go.

jmhz28

Sorry to bring this up from the dead but I am having the same problem. I have PO757 as well and about 50% of the time I am stuck in 3rd gear. There is a 50/50 chance it seems like that when I start the car it will be perfectly fine, or it will be stuck in 3 gear. I have a 3800 VIG stall with no tranny cooler.

I was planning on replacing the A and B shift solenoids and the harness ($55 in parts). Also I have heard varying opinions on just turning the code off.

I have been driving around in D and have had no issues so far. Anyone know why this is?

jrob56

iTrader: (39)

sounds like your answer is one post up, but i would pm some of our sponsors and they could tell you for sure.

jmhz28

But then why does D fix it?

jrob56

iTrader: (39)

Code is coming and going? Hopefully someone more knowledgeable about trans issues will chime in.

jmhz28

Code comes and goes when I am in OD. Transmission will be stuck in 3rd about 50% of the time (sometimes simply restarting the car will make it work like normal). If I keep it in D, then I have no issues.

jrob56

iTrader: (39)

ya thats over my head, pm performabuilt up there and see if they cant help

performabuilt

iTrader: (25)

If you have a stall you will need to remove the test for that code in order to fix its its not a real fault but rather the PCM being confused over the stall.

jmhz28

Removed the code, still happens. Still have no issues driving around in D but its getting to be annoying avoiding highway.

Bugsy

iTrader: (1)

Mine has been doing the same thing for the last couple years. Shutting the car off for 20 or 30 seconds, then restarting it, has always resulted in the tranny resuming proper operation......so far.

Justin Williams

im having a similar issue i have a 99 gmc sierra 1500 4.8l 4x4. Was just shifting hard going from 1-2 but now i was riding around tonight and it stuck in 3rd gear any help would be great trans has 10k on it


also im getting low voltage code on all my coil packs and they r brand new coil and plug wires and plugs

mrvedit

The first step in fixing any transmission "problem" is fixing all engine related codes as some of these codes cause the trans to go into Limp mode.

tallkewlone

on the 99 chevys I have had to replace the pcm, (they need to be flashed for VIN) they have a tendency to go bad and will give you codes like that, all coil packs bad or all oxy sensors reading too low, , If you know the coil packs are good ,(it runs) ,, may want to consider PCM , the shift solenoids do go bad and will throw a po757 code which will set the light sometimes but other times not, If you are stuck in 3rd that is limp. they are easy to replace , just drop the pan and about $15 each