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Old 03-20-2023, 10:18 AM   #1
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Monaco La Palma XL 34PPD Warning Light

Has anyone had experience with the dash Warning light coming on after ascending a hill, topping it and proceding downhill? The light comes on for 20-30 seconds and always goes off. Temp gauge never moves up, no loss of power, no diesel smoke, and excellent oil prsessure. No codes tripped. Any ideas?

2008 Monaco La Palma XL 34 PPD 340 hp Cummins; 70k miles
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Old 03-20-2023, 12:41 PM   #2
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Exactly what light is "the dash Warning light" ...?? Is it a light that has no label? Or what your documents indicate has no label? Maybe we're to assume it is the Check Engine/MIL indicator? But the light is red in color, correct?
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Old 03-20-2023, 03:52 PM   #3
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The light actually is WARNING and is amber. There is no other check engine light. It's intemittent and always goes off.

I'm suspecting a Boost sensor; or exhaust gas sensor; or some type of turbo sensor, but I can't trap this thing
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Old 03-21-2023, 03:41 AM   #4
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This is what I found in the La Palma Owner's Manual:

WARNING: If oil pressure drops and the “WARNING:” lamp illuminates, immediately shut-off the engine and check oil level.

WARNING: Out of range condition exists within the engine protection circuits. Have the motorhome serviced as soon as possible.

Engine Diagnostics:
The engine diagnostics will notify the operator of deviations from the programmed limits of the engine through the “Warning” lamp in the dashboard. Should a system component with the engine develop a deviation, the “Warning” lamp will illuminate and a diagnostic code will be logged and stored in the system memory. These codes are accessed by a service technician using special equipment.



I would get a code reader and see what codes are being set.
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Old 03-21-2023, 07:59 AM   #5
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I bought my rig in late 2008, it has all the right gauges on the dash but in most cases I can hardly see them while driving.



I know how important it is to have the ability to know how the engine/transmission are performing. Temps, oil pressure, boost, voltage were things I was interested in so I looked at options.
At the time there were 2 monitoring systems, Scangauge & Silverleaf VMSpc. I ended up buying a Silverleaf as it offered me the ability to display any of the parameters I was interested in onto a screen of my design. There is another option now, it is Bluefire, which is bluetooth and display on a phone, but I've read where people have had problem with it dropping out and sometimes not wanting to link. Do your research.



So now the rig does not move unless the Silverleaf is displaying all the info and is all good. I have also set up alarms on key parameters so if something happens I'll know it ASAP. The Silverleaf also has the ability to receive fault codes from the ECM.


So long story short I'd suggest you get some sort of monitoring system with the ability to display fault codes.
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Old 03-21-2023, 11:31 AM   #6
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That is a diesel-powered LaPalma, so it is very likely a momentary condition resulting from use of the exhaust or engine brake on the downhill side. It's not unusual in that situation for the diesel engine parameters to briefly get out of range as the engine revs with no fuel being burned (engine braking while descending a grade). Have the stored diagnostic code read out and explained, but I'll bet they say "no worries".
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