2006 Chevrolet Silverado 2500HD LBZ Transmission Issue

[lancer]

I've got a 2006 LBZ with the Diablosport Predator on the highest level (which I believe is 120). The other day when I got off the freeway, the truck was acting odd, in that the torque converter appeared to stay locked up. Its like the truck were a manual and was compression braking. Driving around town for a few minutes, the converter never appeared to unlock. I was able to stop, but after starting again I could tell that it was still locked. The truck did not stall or try to pull through the brakes when I came to a stop.

Next morning, started the truck and the check engine light came on and stayed on. Drove to work and the converter still felt locked up. When I got home I used the Predator to clear the codes, I then drove the truck again and it drove normally (the converter was not locked). Drove fine all weekend, and then today after I got off the freeway, it was clear to me that the converter was locked again. When I went out to my truck to move it a little bit ago, the check engine light was on again. I don't have the list of codes from when I cleared it the other day, but the codes I read tonight are below.

I have searched, but almost everything I found related to the torque converter not locking up, rather than not unlocking.

Has anybody had this problem? Any advice? Is the torque converter bad?

Transmission is stock. Fluid looks clean and red, smells bad. Does not smell burnt, but smells like rubbing alcohol mixed with oil. I have never smelt new oil for this transmission so I have no comparison.

Codes:

P0116 Engine Coolant Temperature Range / Performance
P0181 Fuel Temp Sensor A Circuit Range / Performance
P0700 Transmission Control System (MIL Request)

the other day when I pulled the codes there was also an EGR low flow code.

Thanks for any help you may have.

I have reverted the truck back to the stock tune.

 

[paint94979]

if the converter were locked at a dead stop your truck would die. How fresh is the fuel filter?

 

[WolfLMM]

Sounds like a classic LIMP. Truck was stuck in 3rd. Thats just a guess though.

 

[coldLBZ]

Those codes are block heater related. My truck does it when I plug in when it's too warm outside. Or plug the truck in for less than 4-5 hours. The trans is not stuck in any gear, it just shifts at a higher RPM. The guy at the stealer told me it does that so you know something is up, makes it harder to ignore I guess. BTW this is just the experience I had with my truck. So now I don't plug in until 10F or below, and it hasn't come back yet. I just read your post again and I can't comment on the EGR code though.

 

[LBZ]

Ya kinda sounds like limp to me as well. I don't think it is a problem with a converter staying locked. Like Paint said, it would likely stall or try to push you through the brakes a little at least.

 

[LBZ]

Well that's a weird one Dan.

I'm guessing you either have the egr blocked off or aftermarket exhaust installed which causes the egr code. No big deal and can be fixed with EFI Live or a finger stick.

 

[paint94979]

Well that's a weird one Dan.

I'm guessing you either have the egr blocked off or aftermarket exhaust installed which causes the egr code. No big deal and can be fixed with EFI Live or a finger stick.

Dale you want to put a finger on his stick?

 

[lancer]

if the converter were locked at a dead stop your truck would die. How fresh is the fuel filter?

Replaced in August with a Racor Coalescer.

Sounds like a classic LIMP. Truck was stuck in 3rd. Thats just a guess though.

Truck was shifting, just roughly. Also, it maintains freeway speeds and revs past 2000 rpm

Those codes are block heater related. My truck does it when I plug in when it's too warm outside. Or plug the truck in for less than 4-5 hours. The trans is not stuck in any gear, it just shifts at a higher RPM. The guy at the stealer told me it does that so you know something is up, makes it harder to ignore I guess. BTW this is just the experience I had with my truck. So now I don't plug in until 10F or below, and it hasn't come back yet. I just read your post again and I can't comment on the EGR code though.

I believe you are correct, this weekend when the truck was working I hadn't plugged it in. Last night I had plugged it in and it stopped working today. The previous owner could have blocked the EGR or the exhaust could be giving the code I imagine, I am not too worried about it because it didn't cause the light to come on.

Dale you want to put a finger on his stick?

Sorry guys only girls fingers on my stick

Thanks everybody for their help. I hope that it is only from plugging it in.

 

[THEFERMANATOR]

You need to get it scanned by a better scanner first. You have the P0700, but no actual trans codes in your list. Alot of scanners can't access the TCM to pull codes, only ECM codes. Find somebody with EFILIVE or a TECH2 and check it with that and go from there.

 

[Mike L.]

Go for the engine temp sensor first. If the ECM thinks the engine is getting too hot it will command hot mode in the Alli to start locking the TCC at will to help cool any way it can. Don't think this is any kind of limp.

 

[lancer]

Go for the engine temp sensor first. If the ECM thinks the engine is getting too hot it will command hot mode in the Alli to start locking the TCC at will to help cool any way it can. Don't think this is any kind of limp.

Thanks for answering, Mike. I didn't know that the Allison would lock up the converter to help cool the motor.

Thanks to everyone for their help, I will update if the problem stays away.

 

[steakman]

...Go for the engine temp sensor first. If the ECM thinks the engine is getting too hot it will command hot mode in the Alli to start locking the TCC at will to help cool any way it can. Don't think this is any kind of limp...

That, my friends, is a nice pce of information..added to me data base..thanx Mike.

stk

 

[Cougar281]

As has been stated, the P0181 and P0116 are probably related to the block heater. I started getting the P0181 when I plugged my truck in (never got the P0116 though). It's a performance limiting code, so when it's set, the truck will have no guts.

Definatley find someone with EFILive or a Tech2 to find out why the TCM is setting the P0700. If you're near St Louis, I can check it out for you.

 

[lotsofmiles]

mine doesnt throw any codes when i plug it in, no matter if its 1 hour or all night. 1 degree out this morning, or in the 30's the last time I plugged it in

 

[Cougar281]

mine doesnt throw any codes when i plug it in, no matter if its 1 hour or all night. 1 degree out this morning, or in the 30's the last time I plugged it in

This winter was the first time mine ever did . It may have been a little warmer than required for the block heater tho...

 

[WolfLMM]

Replaced in August with a Racor Coalescer.



Truck was shifting, just roughly. Also, it maintains freeway speeds and revs past 2000 rpm



I believe you are correct, this weekend when the truck was working I hadn't plugged it in. Last night I had plugged it in and it stopped working today. The previous owner could have blocked the EGR or the exhaust could be giving the code I imagine, I am not too worried about it because it didn't cause the light to come on.



Sorry guys only girls fingers on my stick

Thanks everybody for their help. I hope that it is only from plugging it in.

LIMP mode does not limit rpms

 

[LWATSON]

LIMP mode does not limit rpms

You sure?

 

[dubious]

it limits power and gear selection as far as i could tell when my trans overheated.

 

[Cougar281]

LIMP mode does not limit rpms

Correct; Limp will lock the transmission in 3rd gear, but RPM's are not limited. a P1093 (Low rail pressure) will limit RPM's.

 

[WolfLMM]

Defaults to 3rd gear. Trans stays in third, until code is reset or cycle the ign. Thats why truck feels like it has no GO. Not saying that is what happened, but its JMO.