After install of WW2 I've been getting P0238 and SES at high boost. Never got the light previously even at 25 PSI on my gauge.

Now that the light and code are tripping I bought and installed an OCR. Still getting the light and code at high boost.

Spoke with Clay, he advised that I scan with AE KOEO, if the code showed then bad wire, if not possibly bad MAP sensor.

No code, only time it trips is high boost.

Does anyone have insight into this? I doubt the OCR is not set correctly. Bad MAP sensor?? Any other tests?

 

How high are we talking?

 

28-29 psi but my understanding is that the regulator is set to keep the MAP from seeing over the preset level so max shouldn't matter.

Light doesn't stay illuminated very long but code is stored until I clear it.

 

Any chance the regulator is bad or needs adjustment? I'm not familiar with how it works, but my understanding is it goes in the map line and prevents the map from ever seeing anything over "x" pressure, so if the ECM is throwing a code it must be reading more than "x"psi

 

It's possible that the regulator is not set properly but it seems that there could be other causes, question is how to narrow that down prior to throwing parts at it.

Maybe I can test the regulator with compressed air.

 

Yeah, shouldn't be hard. Just need the right hose adapters

 

Has anyone had a MAP sensor go bad on their truck?

 

I've heard of them going bad. Actually there was a thread a couple weeks ago where that was what Toreader_diesel ended up suggesting.

 

Where is everyone else? I'm worthless on this topic, I'm just keeping you company lol

 

Much appreciated regardless Jeff. I'll take another crack at the search engine and do some more AE stuff tomorrow.

After thinking about it probably don't have fine enough gauge resolution at work or home to test the regulator with compressed air.

 

I got the same P0238 code about a week ago during an overboost situation. It comes along randomly and I never paid it much mind until recently. My truck seems a bit sluggish and my mpgs have dropped. My boost readings on my Aeroforce Scangauge don't seem to match my Autometer analog boost gauge, so I have a spare MAP sensor that I will be installing in the morning. I will report my findings tomorrow night.

 

you might want to get ahold of PHP, I don't believe you should be setting over boost codes with their tunes.....

right?

 

Roland, hope the new MAP sensor resolves your issue, looking forward to the results.

Steve, Good point on the tuning, rereading their site isn't super-definitive on this as I might be operating outside normal conditions. I'll try to contact them.

From the powerhungry website:

Some other companies offer "Codes" calibrations for an additional fee. These calibrations prevent the SES light from illuminating. There are certain DTCs that are perfectly acceptable to eliminate such as P0478 (high exhaust pressure) and P0238 (high boost pressure). However, if your truck is setting a DTC such as P1211 (ICP out of range) under hard acceleration, this is frequently a sign of an inadequate or failing high pressure oil system and should be addressed. We strongly advise against disabling this type of DTC, as it relates directly to the performance and longevity of your truck's engine. All of our calibrations are written using tuning parameters which should keep your truck from setting DTCs under normal operating conditions. We believe this should be included in your custom calibrations, so we do not charge our customers for this feature.

 

I'm betting that they didn't prevent it from throwing a code with standard tunes, which would include a stock turbo. Safe levels for a stock turbo is around 30psi, which is right around where you're getting the code. They likely deleted the OVerboost code when tuning for a 38R since it can safely handle higher boost. That would be my best guess.

 

ok im haven the same prob. at high boost i throw a ses light an then my boost leavel drops. the code that i have goten are p0472, p0238, p1211 an also a p1249. but now im only grttin a p0238. so your sayin my high pressure oil pump is goin out?