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Old 05-22-2012, 02:51 PM   #1
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Join Date: May 2012
Location: Virginia
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Air Pressure Alarm

I have a 2010 Fleetwood Discovery 40G with Freightliner Chassis. I had an alarm go off, and the gauge dropped significantly. Within 10 seconds, the gauge popped back up to normal. I stopped at the next safe location and could find no air leaks. This drill repeated itself a dozen times or more while traveling between Disney World and Virginia.

Anyone have any ideas what is going on?
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Old 05-22-2012, 04:01 PM   #2
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I had exactly the same problem on our Bus, except I was in the woods in Alaska. Recovery within a few seconds and it didn't happen for another 10 seconds or an hour plus. When it finally quit long enough for the brake pressure indicator to go to zero and stay there for about 10 seconds, I knew it was an indication rather than air problem. (My emergency brake should have set and it didn't)

All the gauges on the front dash, including the speed and tach are on a single wire. The computer in the rear takes all the necessary readings and streams this info as a code and a reading on a single wire to the dash. This is called multiplexing. All the dash readings are on this same single wire, daisy chained one to the next. If you have the oil pressure first on the wire, you can pull it and put it last on the wire and it'll still show the correct reading.

What I did to solve my problem was to simply pull all the wires and scramble the order they were hooked up in. Since I did that, I've never had my problem again. This could be a simple and cheap thing to try that might work. Good luck.
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad
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Old 05-22-2012, 04:17 PM   #3
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I had this problem yesterday also. I called the Freightliner help desk and its a known problem on some chassis. They are sending me a new wiring harness for the LBCU/guages. Some of the harnesses have bad connectors that loosen over time, thats why its an intermittent problem. BTW, they are sending the harness at no charge.

1-800-FTL-HELP and have the last six of your VIN ready.
Jim with Judy
2017 Newmar Ventana 4369, 2005 Jeep Wrangler (Rock Crawler), 2016 Jeep Wrangler (Mall Crawler)
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