I am new to this board so I am hoping someone has had this happen to them before so they can tell me what is wrong. I have owned 3 power strokes and been very happy with them but with the rebates on the gm and the rebate I had on my gm card I bought a 2005 chevy duramax. I had 3700 miles on it and was taking off to the lake for the weekend. I was just getting on the highway and accelarating up to 70mph when it felt like the motor shut off, it went down to 2000 rpm and that is all it would run pulled over and put it in park it would still not run over 2000. There were no engine lights or messages on the dash truck is stock except for new tires 285's. Shut the truck off and let it sit for 20 seconds and tried again ran fine for about 1/4 mile and did the same thing, called dealer and they said call onstar onstar found nothing. Went home let it sit for about 1/2 an hour and ckd things that I could. Took off again and didn't hppen for another 300 miles. Now it does it all the time. took to dealer they have no idea. Set up appoinment for wed, but I would like to know if this has happened to anyone else.
Thanks

If you have a scanner, look for codes. Probably a P1093. Try changing your fuel filter.

don't have scanner dealer put one on but there were no codes on my ford I only did fuel filter every 15,000. miles this only has 4,000 should it need it already?

Depends on the quality of the fuel you pour in it. If you get a dirty load of fuel, it will plug the filter almost immediately. This is true for Fords as well.

It might not be a P1093 (low fuel pressure), but that is what a 1093 does when you throw one.

If the fuel filters were plugged wouldn't it set a code? I just don't get why it does this, but doesn't turn the engine light on, give any codes or show any messages on the info center, should I just replace my filters without cking anything? thanks

How many miles. It never hurts to change the filter.

I am new to this board so I am hoping someone has had this happen to them before so they can tell me what is wrong. I have owned 3 power strokes and been very happy with them but with the rebates on the gm and the rebate I had on my gm card I bought a 2005 chevy duramax. I had 3700 miles on it and was taking off to the lake for the weekend. I was just getting on the highway and accelarating up to 70mph when it felt like the motor shut off, it went down to 2000 rpm and that is all it would run pulled over and put it in park it would still not run over 2000. There were no engine lights or messages on the dash truck is stock except for new tires 285's. Shut the truck off and let it sit for 20 seconds and tried again ran fine for about 1/4 mile and did the same thing, called dealer and they said call onstar onstar found nothing. Went home let it sit for about 1/2 an hour and ckd things that I could. Took off again and didn't hppen for another 300 miles. Now it does it all the time. took to dealer they have no idea. Set up appoinment for wed, but I would like to know if this has happened to anyone else.
Thanks

Engine limp mode. This happens when you get into and out of it too sharply. The pcm see's boost versus rpm versus throttle position that it isn't expecting and enforces the 2000 rpm limit. No codes get set, and it stays this way no matter what gear you are in, neutral park reverse doesn't matter, until you kill the ignition and let it sit for 20-30 seconds. Then it is reset. Go figure. You can pull over and kill it and wait for 20-30 secs or at the next red light kill it while the light is red and restart when it turns green and you will be good to go.

.

Engine limp mode. This happens when you get into and out of it too sharply. The pcm see's boost versus rpm versus throttle position that it isn't expecting and enforces the 2000 rpm limit. No codes get set, and it stays this way no matter what gear you are in, neutral park reverse doesn't matter, until you kill the ignition and let it sit for 20-30 seconds. Then it is reset. Go figure. You can pull over and kill it and wait for 20-30 secs or at the next red light kill it while the light is red and restart when it turns green and you will be good to go.

. I'll have to try this, seems like the crank 3 times dosen't always work.

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Lly Duramax P1093, Heads up diag.
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cragar Posted: Apr 28 2005, 03:49 PM


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Got a heads up today for Y'all. '05 LLY w/ code P1093 :
Most common fix is the fuel rail pressure relief valve.
Will notice fuel rail pressure drop and will also have high
suction rate noted on the J-tool. Will make you think the filter
is plugged.

Could someone fix the main topic to read P1093... TKS, Cragar.

This post has been edited by ESidvers on Apr 28 2005, 04:07 PM

Mtn Biker Posted: Apr 28 2005, 04:34 PM


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Yep, we just fixed one by replacing the relief valve also. Ours looked normal on the suction side though. Actual fuel rail pressure would drop off on hard accel and pop a code. Relief valve passed the test in SI. Had us going in circles for a couple of weeks.

VL

ChevTech Posted: Apr 28 2005, 04:34 PM


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To that I will add..... YEP! We beat our heads against one of those for a while. Exact same DTC, high vacuum, etc. Now we know and it's sooooo easy to pop that hose off the fuel rail to check. Ours looked like a garden hose when we ramped the pressure up.


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Grand Prize Chevrolet
Miami, FL

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Argon Posted: Apr 28 2005, 04:42 PM


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this requires the left rail,right?


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Jim Ulrich Motor Co.
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roblrobl Posted: Apr 28 2005, 04:47 PM


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We have fixed 2 intermittent trucks with the left rail/relief valve.Found the info on here long before TAC Canada had any info.The forum is a wonderful thing.

danelover Posted: Apr 28 2005, 04:56 PM


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Thanks for the heads up Cragar.


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dballs Posted: Apr 28 2005, 06:05 PM


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Thanks for the heads up!! We have one that we have been fighting with that is intermittent. I now know a place to check next time it is in.


--------------------

Daryn Wieburg
Shop Foreman
Bud Clary Chevrolet, Cadillac, Jeep, Subaru, Suzuki, ETC...
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sreynolds1977 Posted: Apr 28 2005, 11:57 PM


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Thanks Cragar!


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Dexcool Posted: Apr 29 2005, 02:26 AM


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What kind of running condition would this cause?I have one in the shop now.Has black smoke and when command the pressure up it will start to fall off. When driving it blows black smoke,knocks and ping then clears up..

roblrobl Posted: Apr 29 2005, 02:56 PM


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One of mine acted just like that.Rail fixed it.As long as it's an lly.

ChevTech Posted: Apr 29 2005, 04:45 PM


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QUOTE (Dexcool @ Apr 28 2005, 09:26 PM)
What kind of running condition would this cause?I have one in the shop now.Has black smoke and when command the pressure up it will start to fall off. When driving it blows black smoke,knocks and ping then clears up..


Ours was just setting a P1093. That causes the PCM to command a reduced power mode (won't go over 2000 rpms) though I don't recall it being like a TAC problem where it says "Reduced engine power" in the DIC. I don't recall any smoke of any kind.

Just remove that "U" shaped hose on the back end of the left fuel rail. Put a hose on the rail side and stick it into a container, then ramp the pressure up. No fuel should come out of that hose. We had to ramp ours up and down a few times before it started to leak, but once it did, it poured out.


--------------------

Mike Janke, Service Manager
Grand Prize Chevrolet
Miami, FL

ASE Master, L1 Certified


In ancient Egypt, cats were worshipped as gods. Cats haven't forgotten this.


ace Posted: Apr 30 2005, 12:10 AM


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Just finished a lly with 1093 code and relief valve popped off at 100mpa. left fuel
rail fixed it


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this makes sense because like I said the truck according to the dealer and onstar showed no codes. The only problem is the truck will do this even if you don't drive it hard and even if you keep the rpm under 2500 rpm.
Also on the relief valve does it always gen a code? I am just concerned I have a family reunion on thursday and I am supposed to pull my boat over [about a 7 hr drive]. I can't get into the gm dealer till wed and I am frustrated that they don't know what it could be. I only have 4,000. miles on the truck.
Thanks for all the help you guys are great.

may not set a code,but you can give this info to your dealer.as for the reunion that is your call.tow trucks are a phone call away

thanks for your help if anyone else has any ideas let me know
thanks again!!!

pyj mine went into the shop with exactly the same problem drop me a e'mail or a phone number and I'll call you

I called the sales manager on Monday and explained my concern about the trip I am taking and if he could get me into the service dept a little sooner. He called me back and asked me to take the truck up right away and they would squeeze me in. The Service mgr called me yesterday and said the truck was fixed there were about three codes they found I don't have my paperwork with me but one was a 1093. He said they replaced the fuel filter and could not warranty it because of possible bad fuel. No big deal. The tech put 27 miles on it but I believe it was all below 2500 rpm down a rural highway. It never did anything. I picked it drove it 1.7 miles and it started all over again. Took truck back along with the print out of this thread. First thing in the morning the truck takes longer to go into limp mode and you have to drive it over 2200 to 2500 rpm to get it to do it quicker, once it does it, than it doesn't take very long at all. I am guessing the tech did not drive it hard enough.

Just wanted to tell everyone that gave me input thanks. phinds your the man the fuel pressure relief valve was bad. Picked the truck up and put 20 miles on it no problems. You saved me from getting blamed for bad fuel.

THANKS AGAIN

Just got mine back from the dealer for the same problem. Was the sending unit in the tank they had to pull the tank put a new sending unit in. Problem fixed. Also put a new fuel filter on as well.

Had similar problems but that was indeed of fuel starvation.
I had to shut it of and make sure there was no more air in the pump but never had problems after that.

Sorry this is not a solution!

I'm new to this board and have had a few problems that sound like what is being posted on this thread. This code "P1093" seemed to happen to our truck a couple times, according to what is being talked about here.

Our truck fell into limp mode and the shut down seemed to rectify the problem.

We took the truck in to have the injectors checked and to have the OBD run to see what codes were stored. The dealer told us they cold not run the check on the injectors due to erratic fuel pressure being delivered from the "fuel pressure regulator" and that it had more than likely caused the "limp" problem. So, we gave them the OK to do the work @ $1k cutomer pay. They called and told us that our truck fell into the VIN range to have all the injectors replaced.

We picked up the truck and after putting approximately 200 miles on it; it FELL FLAT ON IT'S FACE going up a hill, check engine light came on and was in limp mode once again.

I guess what I'm getting at here is; does this sound like the same problem or is this just one more part @ customer pay I will have to do?

The truck went directly back to the dealer and they told us that the injection pump is bad ($1.7k), it bleeds off pressure. Does this sound like the same thing that is being posted here?

Any comment would be REALLY appreciated!!!

Thanks-
Steve

i have same problem started at 70 miles day of delivery 2005 dually 4wd dealer had said did not pop a code after 7 times at dealer i told them i was gonna to b of auto repair, factory came out with 4 techs kept truck 3 days drove 560 miles got a 401 code and a 405 code they said it needed upgrade to computor program that was at 5000 miles did it again at 7500 miles but when returned to dealer could not duplicate.
they replaced fuel rail for customer satisfaction. now has 13500 miles has just dun it again this time code read 901 fuel rail pressure. changed fuel filter $160.00 did it again today 13,625 miles,went to dealer ordered New 2006 truck lost $22,000 on deal new truck coming in 10 weeks maybe! Good Luck

to lb brake,this was not a problem on the 01,s,could be an injection pump but have seen the fuel pressure sensor give the same problem.

i have same problem started at 70 miles day of delivery 2005 dually 4wd dealer had said did not pop a code after 7 times at dealer i told them i was gonna to b of auto repair, factory came out with 4 techs kept truck 3 days drove 560 miles got a 401 code and a 405 code they said it needed upgrade to computor program that was at 5000 miles did it again at 7500 miles but when returned to dealer could not duplicate.
they replaced fuel rail for customer satisfaction. now has 13500 miles has just dun it again this time code read 901 fuel rail pressure. changed fuel filter $160.00 did it again today 13,625 miles,went to dealer ordered New 2006 truck lost $22,000 on deal new truck coming in 10 weeks maybe! Good Luck

Wow, is that english?

Anyways, I have been having the same problem with my truck. Has not thrown any codes and it is going into the dealer for a second time tomorrow. I am going to drive around in the morning until I can get it to act up so they can't say that they can't duplicate the problem.