[nextlevel38]

started truck this morining very cold been plowing non stop for two days, after start up ck engine light came on, ran ok but it idled about 500 rpm higher than normal for a few seconds.. then went back down any idea??? , code was p0299

 

[blizzardplowman]

Code: P0299
Modules: ECM
Description: Turbocharger Engine Underboost
Might have gotten some snow in the air intake....My 05 would through that code, the 01 and 06 seem immune

 

[brianteel]

I just threw this code in high idle. very strange

 

[nextlevel38]

i cleared it , didnt come back but it sure is strange

 

[Cobra#3747]

If code comes back, check intercooler and pipes/hoses for holes or coming apart.

 

[nextlevel38]

did that all tight, hasnt done it since very cold here this morning seems to be ok

 

[zfuller123]

I've been getting these codes VERY frequently lately myself. Have a buddy helping me to narrow it down so i'd be VERY interested in anything you learn. I'm in Salt Lake - rare that it's been above freezing the past few weeks (happened like 3 days out of the past 3 weeks).... so, i'd correlate the P0299 that i am getting all the time (even at startup) with the air temperature because i've been running a race tune for months without issue... if it means Underboost, that might explain why i get it sometimes when i'm really 'ON IT'...

Also, noting some similarities.... Banks Ram Air is common (including me) on a few threads i've read and a friend of mine that's been helping me figure out this EFI thing also had a friend with Banks Ram air who was getting the same code... Not trying to state anything negative with the Banks kit, because overally i LOVE it, even though my PDA is now just a cool monitor because of EFI Live... The system as a whole made a wonderful change for my truck (I did the whole Big Hoss Bundle).

Anyone else with Banks Ram air ever experienced this? Kinda odd that i've seen this 3 times (including myself) and heard about a 4th case.. all with Banks Ram Air kit...

Any comments Banks??

-->Zach

 

[sparkyss]

Maybe the oils got something to due with it---not flowing as well in cold weather? Or possibly that the VVT is hanging up until it get warm?
Don't think the intake should have anything to due with it but then again who knows. No problems on my end.

 

[brianteel]

i am getting it almost all the time when the high idle is coming on

 

[sweetdiesel]

try changing the ramp time in the high idle setting so it dosnt ramp as fast
this worked for me and another guy

i have banks air kit to it dosnt have anything to do with the air kit imo

 

[sweetdiesel]

i geuss process of elimanation would be best
change to stock for a couple days and see if you get the code
if you still do check for leaks
if you have no leaks change back to stock air...so on and so on

 

[dieselmax82]

Had this code once and I changed the air filter and cleaned the mass air flow sensor, cleared the code and never saw it since

 

[nextlevel38]

havent had this happen since my first post, but as i have access to allot of gm info there a several things that can set this code, however since it hasnt come back i cant go any further

 

[sweetdiesel]

havent had this happen since my first post, but as i have access to allot of gm info there a several things that can set this code, however since it hasnt come back i cant go any further

Do tell maybee some one else could bennifit

 

[Durus Maximus]

P0299 Too!

I got one of these codes last Friday at start-up. Ambient air temp was around freezing. All Data said that 3 Ignition cycles should clear the code. Also recommends a new 90 dollar sensor. The tech checked on part availability. The parts house said the sensor is not a "High Fail Item", so they don't stock that many. Truck seems to run just fine, I'll watch for it again and check some of the things recommended by DP. :thankyou2

 

[brianteel]

i have it everytime the high idle comes on

 

[nextlevel38]

best i can tell now is mine happens do to a voltage drop very odd

 

[dmaxlly]

p0299

My truck threw the same code also. This is the first time the code has shown up and the only thing that has changed with the truck from previous years is I used high idle. I never used it before, so I tried it and the p0299 was set. I do however have the top and bottom bra on the truck also. Don't know if that makes a difference though. I reset the code and as long as I don't use high idle everything is fine and no codes.

 

[Durus Maximus]

Oil and P0299!?

Maybe the oils got something to due with it---not flowing as well in cold weather? Or possibly that the VVT is hanging up until it get warm?
Don't think the intake should have anything to due with it but then again who knows. No problems on my end.

I did an oil change the day before I got this code. The shop I go to recommend the same oil they use for a diesel fleet they service trucks. Hmmmmm!?