Yesterday while driving my 06 the CEL comes on and the truck wouldn't go above 1900 rpm. The truck is 100% stock and has 26000 miles on it. I have not changed the fuel filter for about 7000 miles. l had driven the truck for about 25 minutes then parked it for say 40 minutes then 5 minutes into ride it happened. When I got home (limped home) l shut it off to see if it would clear and restarted it but in neutral it still wouldn't rev. Any ideas? Earl ....it is a lbz

There are tons of reasons possible, but for what ever reason the truck computer sensed something outside of acceptable operating conditions and put the Truck in Limp mode.

Get the codes scanned to see what issues need addressed.

cant really help anymore untill you know what codes are active

What was the temperature when it happened?

my bet is your fuel is gelled up bud. dump a ton of additive in and let it sit for 12 hours or so then go try to drive it again. maybe even change the filter. good idea if its cold out to keep the tank above half at all times. had the same thing happen last winter, when i pumped half frozen diesel into my truck. seemed to sort itself out after a day and the CEL went away.

if you did limp it, try disconnecting the batteries for a few minutes, then reconnect them. this usually will reset the limp...good luck

Mine went into limp mode last week. I changed the fuel filter and now runs like a champ...good luck.

thanks for the replies. it was like 25 out and yes truck was outside overnight. Also tank was like 7/8 full.

so did you get it running right?

yes but l think l have another problem as well. l changed the fuel filter and it revs now. There is some oil up top of the turbo tube where it hooks up to the blue connector. I am embarressed to say but I checked the oil and added 1 quart, dipstick was still dry. added another ....still dry. took 5 quarts. l changed the oil 3500 miles ago. l have been using the mobil delvac oil. has anyone heard about these trucks using the oil?

Just curious, how many quarts did you put in when you did the oil change?

10.... l have an 01 that has 130,000 on it. not my first oil change

I wasn't going there, I don't know all the facts so I was just getting the obvious out of the way!:D With 3 trucks, a bike, and 7 tractors, I change alot of oil myself....

No problem Buckeye. l will try to post a picture of the oil

Fuel filter?

here is a picture of the oil

Isn't that oil accumulation from the pcv valve? Also you aren't loosing 5 quarts through that leak imo.

Here is a pic of mine, 47k...

here is a picture of the oil

That is the reason many folks reroute thier PCV... stock setup discharges oil vapors back into the inlet of turbo... result is oil you see there.

Its very unlikely that you lost 5quarts of oil through the PCV... deffinitly need to do some checking to figure out where its going, thats a pretty serious leak and should be leaving plenty of evidence somewhere.

thats what is confusing me...there is nothing under the truck at all. Can the turbo be sucking oil from the motor and thats where it is going?

Is this the first time you have noticed that much oil disappearing between oil changes? If so I would let it go and moniter it and see it if continues to do it. You could be losing it through the seals in the turbo, or if you had serious blow by you could be pushing that much oil through the pcv, although I doubt that you would have that much blow by.

this is the first time it has happened

Don't know if it applies to you or not, but one local truck driver complained his rig was losing oil - a Detroit in a PB 379 towing a 9000 gallon tanker. When questioned further about it, he admitted he tried to keep from revving the engine "too much" and we figured out low RPM lugging under load caused the high compression engine to blow the oil right out the crankcase vent. Your "vent" just happens to be the PCV which supposedly puts the oil vapor into the intake, turbo, intercooler, intake manifold, then cylinder to be burned. Unfortunately, that oil vapor doesn't stay vaporized and will condense because that's the designed job of an intercooler. The crankcase oil vapor routing through a device intended to condense is a classic Dumb-ass design by GM courtesy EPA.

Chances are if you've the same problem, your five quarts are dispersed within the intercooler (IC). Look underneath the unit at the IC boots and see if there is much of an oily residue there as well. Most times, it'll be more prominient on the cooled air side (passenger side). If so, you might want to clean the IC while you're at it. Pop the boot from the passenger's side lower end of the IC hose attachment and let the oil drain from it for about an hour...in a bucket, preferrably...then re-attach. It's difficult to fathom that much oil loss in 3.5k without some type of catastrophic event occurring. ??? turbo seals ????

Anyway, as you wait while your IC drains, re-route your PCV as described and detailed elsewhere on DP. Your engine will thank you for fixing GM's snafu.

I dropped it off at the dealers tonight. l will update as l find out whats going on.

service writer called me this morning and says the CEL was from low fuel pressure....I'm ok with that one cause you never know what kind of fuel your getting. Next he tells me that its normal to use some oil. I flipped out and said 5 quarts in 3500 miles? My 01 doesn't use a drop. He also said that the oil on the turbo tube (shown in picture above) is normal (l think thats crap). Does anyone with an 06 get some oil on their tube like shown in the picture? He also said the tranny cooler lines were leaking but that has nothing to do with engine oil. Maybe these dealers should have a guy monitoring real world users forums. I swear they think the people driving them are all dummies.

My o6 lbz has some oil on the turbo tube, mostly on the blue cover part. i also have 60,000 miles, don't burn much oil though.

l called them back and told them to change the oil and put in tracer oil to see where its going. We'll see what happens.

My 06 has 41k on it and uses no oil between changes. I do have a small amount of oil on the tube as shown in your photo. My 02 Powerstroke did the same.
I would change the oil and keep a close look at it. If it continues to use it I would take it to the dealer and get it checked out. I like the suggestion about the IC. I suggest you pull the tubes and see if you get anything draining out.

My 06 has 48k on it and uses no oil between changes also. I have very little oil on the tube as you can see in my pic before.

the thing that gets me is....why all of a sudden? I never used a drop before and all of a sudden 5 quarts? cmon

It's strange. That is alot of oil!

service writer called me this morning and says the CEL was from low fuel pressure....I'm ok with that one cause you never know what kind of fuel your getting. Next he tells me that its normal to use some oil. I flipped out and said 5 quarts in 3500 miles? My 01 doesn't use a drop. He also said that the oil on the turbo tube (shown in picture above) is normal (l think thats crap). Does anyone with an 06 get some oil on their tube like shown in the picture? He also said the tranny cooler lines were leaking but that has nothing to do with engine oil. Maybe these dealers should have a guy monitoring real world users forums. I swear they think the people driving them are all dummies.


It is normal to have that amount of oil on the turbo duct work at that place, unless you have rerouted your PCV then you shouldnt have much at all.

"normal to use oil".... yes to a pretty small degree.... i typically use(or more appropriately lose through the PCV) about 1/2 a quart between oil changes.

Low fuel pressure CEL..... since your not running a big tune i would quess you were gelled up....

I picked up the truck from dealer yesterday. I will keep a log on oil usage. It runs better when l hammer it now, much less smoke. See what happens. Thank all of you for your responses.