2013 prostar maxxforce air guage malfunction

Both air gauges pinned at 6 o'clock And low pressure warning alarm sounding.

Everything mechanically seems to be working. I can go down the road and drive through it and it will intermittently return to normal then again go to 6 o'clock and sound the low pressure alarm. There is no consistent pattern to it with respect to the timing of it. Sometimes it will happen for 30 seconds or so then not happen for a few minutes other times it will happen for 10-15 minutes stop for a minute then start again and vice versa.

This literally just started happening a few hours ago, just got into a truck stop to try and diagnose further. I don't know what's going on but have been told so far that you can reset the dash by shutting the truck off then after the display goes out turn the key to on, let everything cycle then turn it off and repeat two more times. I was also thinking about pulling the battery cables to cut power to the cab and try to reboot the ECM and BCM...

Any other suggestions? And would LOVE to hear from someone that may be able to offer some insight into what is ACTUALLY going on. Electrical short, bad harness wiring, sensors perhaps, maybe the BCM itself???? HELP!!!

 

Thank you! Much appreciated!

It's throwing 1079 fmi 1 - short on gauge, I think?

Seems like it could be water related, been driving in and out of heavy rains the past 24 hours, everytime I hit a patch of heavy rain it goes off and stays that way until about 30 min after clearing it then it'll be fine until I hit HEAVY rain again. Could be coincidence but it's the most consistent thing to coincide.

Anyway, you've certainly spelled it out clearly enough. Thanks again.

 

I'm gonna have to pull the gauge cluster aren't I???

 

Got er fixed up - job made easy by your input. Much appreciated.

We'll see what's next - always something with this truck.

 

Wiring, shorted 5v reff. And you were not kidding about it being a lot of fun to get back in there.