=== Update #2 ====
The dealer is telling me that they need to replace the fuel filter assembly ($900 bucks and isn't covered by the 100k mile warranty) because of excessive vaccum. I've instructed them to replace the fuel filter and check the vaccum situation prior to the expensive replacement.
If it comes down to the assembly replacement, am I out of line for expecting the 100k Bumper to Bumper to cover that replacement?
:mad:
=== Update #2 End ====
===UPDATE====
Okay folks. I made it back to PDX yesterday evening (no strange behavior all day, but the SES light remained lit). First stop was at the Dealer for a code download before I shut the motor off. Based on past behavior I was reluctant to shut down prior to code removal. The codes were 87 and 93.
I'll be dropping the truck off for them to repair. So, my question to the experts is what do those codes mean?
Thanks for all of your help so far!!!!
===Update end====


New to the forum, sitting in a hotel trying to figure out what is going on with my '01 DMAX on a long distance trip as I try to make it back home. Here is the scenario, pardon the long disc. as I'm not sure what is important:
It all started 11/20 1920 miles into a 2000 mile leg of the current journey. Running at 75 MPH dropped into the passing lane to go around a car that I was creaping up on, stepped on the fuel and the truck fell on it's face and SES light came on. I took it down to 0, shifted to park, back to drive, tried a normal accelleration and it felt normal until 2500 rpm, then back on it's face. After several attempts, I nursed it up to 65 MPH and limped in. Monday morning, it behaved normally (SES light still on) I took it to Jim Glover Chev. in Tulsa, dropped it off and headed to Dallas in my dad's truck. JGC called and said that the SES light was no longer on and they only read a code that indicated a replaced fuel filter and they could not get the truck to behave badly. They suggested that I take it for a spin around Tulsa on Tuesday and try to re-create the behavior. I tried for several hours, no joy. They charged $180 for reading the codes (said it wasn't covered in the 100k mile warranty since they could not find anything wrong) and sent me on my way.
Fast Forward to 11/28 1000 miles into the return trip. Same behavior started at the beginning of the day in Larmie WY. Since it is Sunday, I just nurse the beast down the road until it needs fuel. Upon re-fuel re-start, the symptoms go away for a few miles and then return (SES light stays on the entire day).
I have around 500 miles left in this trip from hell until I return to the Portland Oregon, home base. At that time, I'll take this beast to the local dealer and see what they find. In the meantime, I'm looking for some intelligence from you folks out there in Diesel Place land. The truck is *COMPLETELY* stock. No aftermarket anything. I've stuck to the schedules and change the oil every 5k. I'll be discussing the $180 with Chevrolet when the problem is finally solved.

Reading this section and the Allison section, it sounds like I'm limping the Alli, but not for any of the normal reasons. At this point, I'm rapidly reaching the "I want a new tranny" feeling because I'm not trusting that the service folks at JGC helped prevent this situation and I'm not sure that the last 800 miles or so have been good for the Alli.

Thoughts, Comments, Flames, whatever. At this point I'd pee on an electric fence if I thought it would help.

My 01 did the same thing but it coded that it had a high return fuel rate from injectors I would check the filter for water and see what you got.Mine was exactly like you described cruising along went to pass and fell on its face .Good Luck

Make sure you get the codes from the dealer - there are people here who can help you with this if thay have that information. What were the temps in Wyoming? I have had fuel gel on me, and it was somewhat similar (without the limp and the SES light). Have also had one of my filters plug up, and got exactly what you are seeing. I ended up with all the codes for injectors, but physical examination of the filter showed it plugged (it was a coarse filter used to keep crap out of my fuel tank selecter valve).

Sounds like injectors leaking, PCM will limit fuel pressure.

I dont think you limped the trans, if you did it would go into neutral and stay there until you shut the vehicle off and restarted it. At least thats what happened when I limped mine. I would think you have a fuel filter problem or something like that.

Good luck with your truck!

Mine just did the same thing yesturday and today i spent an hour on the phone with the dealer and then chevrolet. they finaly gave me the number to allison where a guy told me to change the fuel filter so i did and it runs like new.

The very very first thing to do is change the fuel filter.

Jess

Yep, the exact same thing happened to me. Engine continued to run as long as I wasn't pedal to the metal. SES light came on. I pulled out the reader and it mentioned something about fuel pressure.

I change fuel filter the next morning and all has been well since. It wasn't water, so I can only imagine it was clogged. I always carry a spare filter under the rear seat. And because I don't tighen the fuel filter with a breakover bar, I can easily change it from the top.

[QUOTE At this point I'd pee on an electric fence if I thought it would help.[/QUOTE]
That might make the 'RUN' to get a fuel filter a little quicker ):h

My 01 did it..... over boost code. Totally stock truck.

Juice fixed the problem entirely.

Code 87:
Fuel Rail/system pressure - Too Low

Code 93:
Fuel System Leak Detected - Large Leak

Hope this helps