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Old 10-02-2022, 09:00 AM   #1
Junior Member
Monaco Owners Club
Join Date: Aug 2022
Location: Warwick RI
Posts: 3
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.

Thank You
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Old 10-02-2022, 10:46 AM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 32,364
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 ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 10-02-2022, 01:08 PM   #3
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Monaco Owners Club
Join Date: Aug 2022
Location: Warwick RI
Posts: 3
Engine wont shut off

Yes it is on a road master 8 bag
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Old 10-03-2022, 05:44 AM   #4
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Join Date: Oct 2019
Posts: 507
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.
1999 American Dream 40DVS
Spartan Chassis, Cummins ISC 330
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