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Topic: ok, why is my behind the dash beeper beeping? (Read 661 times) previous topic - next topic

ok, why is my behind the dash beeper beeping?

This one has me going in circles.

Driving northbound down the I5 Grapevine grade, just after reaching the bottom getting off the retarder and on the gas, the beeper behind the dash sounds for a couple of minutes, then goes silent.

All the gauges look fine.

I took it to Valley Power, an Allison shop, and the computer shows no stored fault codes. The dipstick shows a good level, and the atf  is clear, clean, fresh smelling Transynd.

I got my vmsPC working. Today on then same run, one shorter downgrade before the last one,  the retarder temp did momentarily hit 308, then dropped to 260. No beeping. On the final long downgrade, I carefully keep it in 4th and lightly use the retarder. Temp is mostly under 250, once hitting 260. At the bottom of the grade the beeper sounds again, just like before. I have everything monitored on the vmsPC, and everything is normal. At the next stop, I check for fault codes, and there are none.

So....what is going on here? I don't see this on any other downgrade.
Tom Lang K6PG (originally  KC6UEC)
and Diane Lang
2003 38 U295 build 6209
2016 Jeep Grand Cherokee Summit Ecodiesel
still have tow-ready 2006 Acura MDX 
Temple City, California
Motorcade 16681 California Chapter President
SKP 16663 member of SKP Park of the Sierra, Coarsegold California
FMCA F071251
Retired electrical and electronic engineer

Re: ok, why is my behind the dash beeper beeping?

Reply #1 –
Tom, just a thought. Is there some sort of radio transmitter in the area? I wonder if some stray RF is getting into your system somehow.

Re: ok, why is my behind the dash beeper beeping?

Reply #2 –
Low air pressure?
It's the only beeper I have under the dash on my '90.
36' 1990 U280 GV

Re: ok, why is my behind the dash beeper beeping?

Reply #3 –
You have a much later coach than mine, so it is probably different.  Mine sounds for a lot of different things.  The one thing that caused it to sound when it should not was a bad antenna up switch.  Maybe it is something that is unrelated to the grade, that is if other things can make it beep.
Jerry Whiteaker former owner 96 U270  36' #4831 Austin,TX-Owner Mods LCD TV w/front cabinet rebuild - LCD TV bedroom - Dual Central AC, either can cool coach w 30 amp - Skylights at roof AC openings - Drop ceiling for ducting of AC - Shower skylight white gelcoat/wood/epoxy frame - Air Springs/Shocks replaced - 2014 CRV - 8K Home Solar - Chevy Volt

Re: ok, why is my behind the dash beeper beeping?

Reply #4 –
It seems like every year is a bit different.  James T. at FOT might be able to get you a document that tells what makes the beeper beep.  My 2001 has an apparent blue box failure that makes the pressure gauges read zero, the red lights to come on and the beeper to beep.  I put a switch in the annunciator wiring to silence it but I miss it to help me to remember to turn off the turn signal.

Roger
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: ok, why is my behind the dash beeper beeping?

Reply #5 –
seems like a few of us are haviong beeping problems.
On the way back from Mexico for the first 2 days it kept coming on for different lentghs of time then the 3rd day nada. The 4th day just a couple of times after I noticed that when it beeped I took my foot off the throttle a bit and it stopped almost right away. Every time same thing. While the beeping was happening the "check engine" light came on. VMSpc said nothing and no change in readouts on computer. That night I tied up the wiring harness that goes down the injector side so it did not touch engine and no more beeping? Coincidence or?? Any thoughts?
JohnH
Coachless, now use aircraft. 2003 Ford Travelair TC280 class C. Super shape. Just for 1 yr .
1994 Ford E350 ClassC,total renovation inside and out. Now sold.
2000 U295  36' Cummins 350 c/w Banks Stinger, Resonator upgrade,Solar, LED lites.Residential fridge with slide out pantry. Build 5674. Sold
ex 92 GV 022C ored Cummins. Sold
ex 95 GV240 cat 3116. Sold
2017 Mini cooper s & 2016 land Rover LR2 HSE  LUX.
jhaygarth@aol.com    SKP #130098
treat everyone as you would like to be.

Re: ok, why is my behind the dash beeper beeping?

Reply #6 –
I wonder if the batwing antenna might have a mercury switch to chime when it is up and the engine running. Might be the grade and pavement are just right to set it off. For what it's worth, I am always in the number three lane doing 55 when this happens, at exactly the same place.
Tom Lang K6PG (originally  KC6UEC)
and Diane Lang
2003 38 U295 build 6209
2016 Jeep Grand Cherokee Summit Ecodiesel
still have tow-ready 2006 Acura MDX 
Temple City, California
Motorcade 16681 California Chapter President
SKP 16663 member of SKP Park of the Sierra, Coarsegold California
FMCA F071251
Retired electrical and electronic engineer

Re: ok, why is my behind the dash beeper beeping?

Reply #7 –
Check the ground wire bus bar in the dash.  Sometimes these short out requiring cleaning.
Peter & Beth Martin
No Forrest? What have you done?
MC# 15890 until Dec 2016; FMCA #F329677
Cincinnati, OH

Re: ok, why is my behind the dash beeper beeping?

Reply #8 –
John,
When you let up on the throttle torque goes down and the engine probable moves a little.
You also say you tied up a wire bundle on the engine and think that helped.
So if the problem comes back in the future I think I would start the search at that wire bundle.
John Duld
1995 U320C SE 40'