"Low Boost Code" With new turbo

[JCasper]

I keep getting this code when I am towing. It has happened 3 times now and throws me into limp mode.



I have a boost fooler plugged into my factory connection where the stock turbo was plugged in.



I need to find some way to eliminate this. Does the Quadzilla boost fooler work better, will it help my problem?

 

[mattymac]

Boost foolers only work on the upper end of your boost reading (from exceeding max boost values) We are having the problem of boost reading to low at cruising/low speeds, there is no fix that im aware of other than clearing it with a downloader.

 

[RobertP]

the best way i have found to avoid this code is to use the sensor from the factory turbo and just zip tie it up out of the way. and just find a box that will keep the overboost code away and your good to go.

 

[JCasper]

the best way i have found to avoid this code is to use the sensor from the factory turbo and just zip tie it up out of the way. and just find a box that will keep the overboost code away and your good to go.

If I do this, it will keep the code away? The sensor will just unbolt from the factory turbo, I am assuming? I will need to look at it tonight.



I am running a Smarty, but have also seen the Overboost code before. It isn't as much of a problem as the low boost.

 

[RobertP]

If I do this, it will keep the code away? The sensor will just unbolt from the factory turbo, I am assuming? I will need to look at it tonight.



I am running a Smarty, but have also seen the Overboost code before. It isn't as much of a problem as the low boost.

yup that should take care of the low boost issue. i have never seen that code at all on my truck. i do get the overboost code quite often though but it really hasnt effected anything that i know of.

 

[JCasper]

yup that should take care of the low boost issue. i have never seen that code at all on my truck. i do get the overboost code quite often though but it really hasnt effected anything that i know of.

Unless I hear of something else I will put that on before I tow again in a couple of weeks.

 

[mattymac]

the best way i have found to avoid this code is to use the sensor from the factory turbo and just zip tie it up out of the way. and just find a box that will keep the overboost code away and your good to go.

Anyone who tows (and sometimes suttle cruising with the right conditions) with a bigger than stock turbo usually gets this code! It also has NOTHING to do with the electronic WG sensor. It has to do with the MAP sensor getting a lower than "normal" boost reading at either cruising or towing conditions (from what I have seen) since the programming in the ECM is more sensitve to safety and emmisions than prior years and it (ECM) is thinking theres a boost leak or problem with the turbo (or whatever) so it then cuts back the fuel to keep EGT's in check (since we all know these motors stock run alot closer to the point of meltdown) there is less room for error.

 

[JCasper]

Anyone who tows (and sometimes suttle cruising with the right conditions) with a bigger than stock turbo usually gets this code! It also has NOTHING to do with the electronic WG sensor. It has to do with the MAP sensor getting a lower than "normal" boost reading at either cruising or towing conditions (from what I have seen) since the programming in the ECM is more sensitve to safety and emmisions than prior years and it (ECM) is thinking theres a boost leak or problem with the turbo (or whatever) so it then cuts back the fuel to keep EGT's in check (since we all know these motors stock run alot closer to the point of meltdown) there is less room for error.

So are you saying there is nothing I can do about it?

 

[mattymac]

Theres no way that im aware of with running bigger turbos.



The only way would be to make the MAP sensor give out a higher voltage reading to the ECM within its limits yet in a way suttle enough where its driveable and not make the ECM unhappy and throw a code (since the MAP sensor helps determine load on the motor thus giving the ECM fueling requirement info)



Or be able to rewrite the parameters in the ECM for acceptable boost limits on the low side?

 

[JCasper]

Theres no way that im aware of with running bigger turbos.



The only way would be to make the MAP sensor give out a higher voltage reading to the ECM within its limits yet in a way suttle enough where its driveable and not make the ECM unhappy and throw a code (since the MAP sensor helps determine load on the motor thus giving the ECM fueling requirement info)



Or be able to rewrite the parameters in the ECM for acceptable boost limits on the low side?

I guess I didn't pay much attention prior to purchasing this turbo, but I don't remember hearing of this problem before it happened to me the first time.



I am a bit bummed about it. It always seems to happen at the worst time.

 

[Bob Wagner]

I have talked to Marco in regards to the P0299 and the code can be set anywhere in the map so writing a specific program is not an option

 

[JCasper]

I have talked to Marco in regards to the P0299 and the code can be set anywhere in the map so writing a specific program is not an option

Hmmmmmmmmm, I wonder what to do now.

 

[R_Painter]

I made my own boost fooler when I put on my silver bullet and have yet to see a low boost code.

 

[mattymac]

I have talked to Marco in regards to the P0299 and the code can be set anywhere in the map so writing a specific program is not an option

But is there a set variance of range(s) in the boost scale that are acceptable and unacceptable for what the ECM "wants" to see such as a certain percentage of boost at any level?



From what I have seen the 0299 code happens to me 99. 9% of all the times while im towing heavy on the flats at cruising or sustained speeds, which means below 15lbs. once in the hills where boost is all over the place its less of an issue.



I understand that there are MANY diffrent variables in the progamming and the changing of programming that can take place but if it can be written then can it be re-written inside the ECM or is it not really an option?

 

[mattymac]

I made my own boost fooler when I put on my silver bullet and have yet to see a low boost code.

Did you ever experience the 0299 before? Do you tow? Is it a true boost fooler at the MAP sensor or the WG solinoid bypass? Could you share some insight on what you made and how it functions?

 

[R_Painter]

I only saw the 0299 code when I had no boost fooler. I have aquad boost fooler at the map sensor and a homemade fooler at the bypass plug. Instead of buying the $25 plug from II I bought a 1 amp 100 ohm resister and solidered it between the two wires off the factory harness I cut off my factory turbo. Plug it in and have never seen a low boost code on my triple dog when I check for codes.

 

[RobertP]

Did you ever experience the 0299 before? Do you tow? Is it a true boost fooler at the MAP sensor or the WG solinoid bypass

with my WG solinoid just hanging, and my sps 66 ive towed about 12-15 thousands pounds with no issue. i have never experianced a low boost code. i will see soon how the SB 66 tows also.

 

[mattymac]

with my WG solinoid just hanging, and my sps 66 ive towed about 12-15 thousands pounds with no issue. i have never experianced a low boost code. i will see soon how the SB 66 tows also.

The whole purpose of the WG solinoid is to hold off boost pressure (and the opening of the wastegate) then when it recieves its signal from the ECM to then open it dumps drive pressure and keeps the turbo from spinning into orbit, it has no way of reading boost pressure its just a dumpvalve used to help control emmisions. I have tried it both ways with the II resistor and the factory WG valve hagging. Both have yeilded the same results triggering the 0299 (as it should since this vavle/resistor has nothing to do with "BOOST READING". Myself along with many others are in the same boat. Why yours isnt doing it is beyond me.

 

[WOT]

Would an aftermarket intercooler help? I have heard that since they are less restrictive you can actually reduce the pressure drop through the intercooler and effectively have more boost under the same conditions as monitored by the MAP sensor. Of course $1000 to figure that out might be an expensive guess. Maybe someone needs to put together a matrix of year, options (auto/man), and mods for people that do and don't have the problem.

 

[JCasper]

I am still wondering how I missed this. If I would of known of this problem I would of thought twice about the bigger turbo. It is very annoying having to pull over and clear the code.