I have a 2004 , 3500 dully with duramax and my living is haulling RV trailers. No haul trailers,,,We starv. When in drive I can't get the RPM's above 2000 and that is where most trans. shifts are at. If I have a trailer in tow I am sometimes stuck at 30 mph. and if I do get it up to speed the best I can do is 63 MPH What do I check???

Help

I have a 2004 , 3500 dully with duramax and my living is haulling RV trailers. No haul trailers,,,We starv. When in drive I can't get the RPM's above 2000 and that is where most trans. shifts are at. If I have a trailer in tow I am sometimes stuck at 30 mph. and if I do get it up to speed the best I can do is 63 MPH What do I check???

Help

Do you have a check engine light?

No Check engine light. every thing is just perfect except for the speedo says I am going 180 mph

No Check engine light. every thing is just perfect except for the speedo says I am going 180 mph

If you are still within warranty, take it into the dealer.

Any mods? Does it only do this hauling? In my limited experience, that's what our truck does when the tranny limps.

give us some more info on your truck like MrsSpoolin said then we can make a better guess.

It is off warrenty , 122000 miles and there has been no mods

MRSspoolin??

I droped off a trailer this morning and if the engine was shut off for a few minuts ( 10--15) I found it was normal but it soon went back to the 2000 rpm limit

What info would you like as everything is just great except for this problem . fuil consumption is normall , no weird sounds just acts like there is a govner set at 2000 rpms

What info would you like as everything is just great except for this problem . fuil consumption is normall , no weird sounds just acts like there is a govner set at 2000 rpms

Not that I know alot either. But to me it sounds like to me it throwing a 1093 which limits the RPM's to 2000. Esp if it goes back to normal after you shut the engine off. Does it go back to normal everytime you turn the engine off?

Yes it seems like it does. When it started it was good untill the tranny shifted down on a hill then the engine would bog down untill I was down to a speed and gear would be under 2000 rpms. If I was fast I would drop the cruise and try to save the speed. @2000 rpms was the limiting facter

Yes it seems like it does. When it started it was good untill the tranny shifted down on a hill then the engine would bog down untill I was down to a speed and gear would be under 2000 rpms. If I was fast I would drop the cruise and try to save the speed. @2000 rpms was the limiting facter

How old is the fuel filter? If it just started happening you might want to change it to see if it helps. We get 1093's it is mostly when we put larger tunes in.

How can I get the cods from this thing. The only info I have been able to get was out dated as the pins they said to jumper have no contacts in my plug.

I will change out the fuill filter in the mourning. It wasen't that long ago that I changed it but at more than 10000 miles a month I guess not that long is a lot of fuil

I got some bad fuel or someone put crap in my tank but only 1500 miles on the last fuel filter.

For some reason your engine is being told to go into "limp home" mode.

It is odd that it is not giving you the Check Engine Light.

If you go to any AutoZone or similiar car parts store, they will read the codes for free. Or they can sell you a cheap code reader/resetter.

If you get a Predator/PPE/Quad/Bully Dog they can read and reset codes.

If it is an LLY, the P1093 (actual rail pressure does not match commanded rail pressure) code is one common cause of Limp Home. A dirty filter can cause it, as can a defective drivers side fuel rail relief valve.

But first find out what the code is. No sense fixin what aint broke.

If you turn off the engine, turn back on for a minute, repeat 3 times without the error, it will clear the code and the history of the code. But it sounds like you keep throwing them, so if it is the 1093, first do the filter.

Also, when was the last time you checked/changed the tranny fluid and filter?

MRSspoolin??

Yes, and Kat is also female. There are a few here.


I am talking about chips, or programmers. Have you changed the exhast, differant type of air filter, anything on the truck other than what can stock? I see you said no mods, but some people don't consider a K&N air filter a mod, when it can be. Does it only do this while hauling, I'm still not clear on that.

it sounds like it could be a fuel or air filter restricting air flow, happened to me once (full of snow). The only other thing that comes to mind is the transmission high range shift selector. But, if that goes the transmission gear indicator usually goes on the fritz, it will set a check engine eventually and will go into limp mode (stuck in 1 gear).

sounds like speedo sensor to me

when you find out what the problem is, and what the fix is please post it or email me my 2004 has been like yours for 6 months. my post is limp mode still 5 months on. im in australia and not getting much help. appreciated.brad. email:lavenco@albury.net.au

when you find out what the problem and what the fix is please post it or email me. my 2004 has been like yours for 6 months my post is limp mode still 5 months on im in australia and not getting much help. appreciated. brad. email:lavenco@albury.net.au

well today I did change oil and filter. I also changed fuil and tans, filters. It ran good going into town to get parts. we will see how it goes as tomorow I am off to saskatoon to pick up a boat to tale to LA. thats a 2300 mile trip. Hope it goes well. Thanks for all the help.

Still wondering...
Does it only do this while hauling, I'm still not clear on that.

Sounds alot like what happened to my dad's truck he had all the same things happening but his was still under warrenty and it was also a LB7 I believe the fuel injectors were bad.

I just did a 3400 mile trip and no problems. I changed fueil filter, air filter, and found 2 things ( grey little box things I thought were relays. ) lose and had no problems. I also bought a code reader and will carry it with me as I never had a check engine light. Now if I could just get the speddo to say I wasn't gping 60 MPH when I am parked. Thanks guyes and ladys.. Thanks for your help.

I just did a 3400 mile trip and no problems. I changed fueil filter, air filter, and found 2 things ( grey little box things I thought were relays. ) lose and had no problems. I also bought a code reader and will carry it with me as I never had a check engine light. Now if I could just get the speddo to say I wasn't gping 60 MPH when I am parked. Thanks guyes and ladys.. Thanks for your help.

I think you are going to need a new instrument cluster to fix that. We just had to have ours replaced.

If it's limped it will restrict your rpm's to 2 grand. Coming through canada, I didn't have a cold front on the truck and the transmission limped. You can milk it up to 60 then but it's a big pain, as you have found. Towing, I would not even bother. Not knowing your past history with the truck IE what milage you bought it at, etc, doesn't help. The limp mode and check engine light typically "go away" after a while, after around 10-20 ignition cycles. Mine went away, then when I brought it in for something else they told me I had about eleventy billion codes. I knew what they were all from and it ended up it wasn't a big deal. Now we're at 40,000 miles and still running strong.

More information as to service history and vehicle history, modifications, et-cetera would sincerely help everyone's diagnosis of what exact problem you are having, and a way to remedy the situation permanently.

I had the same problem (2000 rpms is tops). I composed a lengthy explanation as to what I went though but my message disappeared when I tried to send it so I'll just give you the results of my experience and research. I should have pushed the tow/haul button! The service light came on and when I checked the codes found that the transmission module had failed. I erased the code and have not had a problem since. I believe the computer put the engine in a fail safe mode so as not to overwork the tranny. My brother-in-law confirmed this with a situation with his Avalanche that was exactly as mine. I have not had the problem recur since I erased the codes 145 miles ago. Tomorrow I expect to be hauling a load and will let you know if the tow/haul button being pushed solves the problem. Actually, it could be a week or more before I haul the load, but I will let you know.

If your speedo indicates 60 MPH when stopped, (equivalant to about 1800 RPM), I'd guess either your rev limiter or speed limiter is kicking in like it thinks it should be doing. Could maybe be a computer problem, or maybe the speed pickup. Just a guess.
Don't think it would be fuel related if your rev limit is consistantly 2000 RPM. Wouldn't fuel problems limit based on load on engine?

Off chance, do you have a catalitic converter on this truck of yours???? As this sound just like a plugged converter.

symtems are, engine idles perfectly, if you rev the engine, rpm will shoot up BUT will bog down, driving you will take off but will bog at a particulare rpm, no fault codes.

this has happened twice to me with GM cars.

quick and only test. use a 3/4" hole saw cut a hole in the exhaust ahead of the converter. mine is all welded.

rev the engine if the rpm is unlimited, problem solved.

to patch use 2 pipe clamps and acurved plate.

good luck.

I've have had this happen 4 times on my 02, have 80K on it now, everytime it has been a dirty fuel filter, it will smoke a little in heavy throttle, I just change the filter and it is full bore again. Good Luck http://www.dieselplace.com/forum/images/smilies/smile.gif

I have a 2004 , 3500 dully with duramax and my living is haulling RV trailers. No haul trailers,,,We starv. When in drive I can't get the RPM's above 2000 and that is where most trans. shifts are at. If I have a trailer in tow I am sometimes stuck at 30 mph. and if I do get it up to speed the best I can do is 63 MPH What do I check???

Help
Sure your wife didn't install a governor):h

I have a 2004 , 3500 dully with duramax and my living is haulling RV trailers. No haul trailers,,,We starv. When in drive I can't get the RPM's above 2000 and that is where most trans. shifts are at. If I have a trailer in tow I am sometimes stuck at 30 mph. and if I do get it up to speed the best I can do is 63 MPH What do I check???

Help Sure your wife didn't install a govorner):h

i think is a speed sensor.at 160 mph the computer is probably saying slow down!!!! and there's should be no codes..

do you have a high idle switch. i know if mine is on it wont let me get over a certain rpm

Mine does that in the winter sometimes because of fuel restriction somewhere. I have to let it stay in a hot garage for the night and all is well in the morning. Is your fuel filter ok? Could your fuel line be clipped somewhere?