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Thanks so much guys, I greatly appreciate all the help. Found the plug for the sensor. Going to order it and install it.

ORB?

Install it and just zip tie it up right the sensor should be open to normal air or should it be mounted on something special?

Looking at both of these sensors pricing, typically I’m all about original Cat parts but they are each $260 from cat and after market are around $50. Anyone can add there 2 cents about which is better the same etc.

oops

After my original ECM died and I purchased a new one from cat and they flashed it to 330 hp I never had it connected to something that could read codes until the other day at cat when they changed my speedometer pulses for the eco hubs. Thanks guys, So that mystery solved! Now for a solution...

What do yall see on your trucks? Do you have this sensor? Do you have this trouble code? If you don’t have it then why?

That would explain a lot. But this trouble code did not show up years ago after I replaced the ECM with a new one from cat. There is an empty plug in the harness that is in the location of where that sensor should be.

Or the 3126B motor

Also the part numbers are only one number different. And why does it say resistor thermal, atmospheric sensor and not barometric?

Great picture! I just found a different picture showing it in the technical manual. Focus on item numbers 15 & 19. 19 I’m assuming manifold absolute pressure or commonly called MAP sensor which could also be call barometric pressure sensor. Problem I’m coming across is I don’t have item number...

Not sure what you’re saying.

Cat 3126b is turbo. I found the boost sensor but still can’t find the barometric pressure sensor.

I’m looking for barometric pressure sensor.

I unplugged what I believed to be the barometric pressure sensor and the I got another trouble code that was boost related and had the same description “ voltage above normal or shorted to high” So it definitely sounds like a bad or disconnected barometric pressure sensor. But where the heck is...

I’m getting a fault code 108 3 Barometric pressure. Voltage above normal or shorted to high source. I was planning on replacing the sensor but cannot verify the location of this sensor any know where it is? I believe the boost pressure sensor is the same part and I don’t want to replace the...

That’s an interesting thought about using the trip to get averages. Thanks, Still working on the cluster colors. The green numbers have been changed to white and enlarged. About 5 hours into programming also changed engine torque to barometric pressure.

Not sure how accurate that 7.5 average mpg is. It was there when I first plugged the blue fire up. Not sure if that’s over the life of the ECM or what. It hasn’t changed and I can’t figure out how to reset it. I put a new ECM in it 6-7 years ago.

Just returned home after a 120 round trip to Caterpillar where they programmed the ECM Speedometer parameters. Here in Florida driving long flat straight roads with no wind adjusting the cruise control speed every ten miles or so and watching the Bluefire instant fuel consumption. It looks like...

Maybe I’m the unlucky one.