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Old 10-02-2022, 10:00 AM   #1
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Monaco Owners Club
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Location: Warwick RI
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Can't shut off engine....

I have a 2000 Monaco diplomat with a 275 ISB Cummings. I have a problem that just started a couple of weeks ago. I have been to two mechanics and they both could not find a remedy to repair it. Here's whats happening, When I stop the coach I apply the parking break and place the transmission in neutral. Then turn off the key and the engine is still running. At that point I have found that if I push the reverse button the engine will shut down. No codes are showing up. I know this is strange but does anyone have any ideas of what I can do to fix this.


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Old 10-02-2022, 11:46 AM   #2
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Welcome to iRV2 .

There have been a number of similar posts over the years ; but usually required chassis battery disconnect to shut the engine down .
But then I can't say if they had tried using the trans shifter .

From your description , it would appear there is enough voltage to keep the engine ECM active but not enough amperage to activate any transmission functions .
Can you try using the turn signals to see if you get the same shut down ?

Similar issues on Freightliner chassis , traced back to a defective diode in the alternator activation wiring . Another member found that his cross over between battery power and ignition power was due to internal issues with his dash radio, that allowed the power for the radio memory to cross over to keep the ignition side powered up .
To eliminate the radio as a possible cause , pull both the fuses that power radio function, or disconnect the wiring from the radio.

Is your coach on a Roadmaster chassis ?
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Old 10-02-2022, 02:08 PM   #3
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Engine wont shut off

Yes it is on a road master 8 bag
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Old 10-03-2022, 06:44 AM   #4
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Start pulling fuses while running (key Off) and see if it shuts down and trace from there. There is a bad diode somewhere back-feeding the ECM.
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