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Old 12-25-2016, 12:06 PM   #1
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Workhorse R30 Engine Comm Fail

Hello and Merry Christmas

My Thor Mandalay Presidio with a Cummins ISC and Allison won't start and is throwing an Engine Comm Fail and Trans Comm Fail error.

My wife and I were traveling in snowy weather yesterday and stopped for fuel. Everything was running fine, tho slush buildup on lower half of the motorhome. Went to start to leave and dash lights up with error codes.

We got towed to a corner of the parking lot and now we are camping. Temp yesterday was 32, today it is 16 & very windy. They are calling for -6 tonight. So, it is a bit difficult to work on it.

Anyway, looks like we are stuck here until Tuesday before anything opens, fuel and propane tanks are full.

It must be a connector, but I don't know where to start. I looked over the ECU in the inverter Bay, nothing obviously wrong.

Any suggestions?
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Old 12-29-2016, 11:26 AM   #2
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For anyone searching this problem in the future, it was a bad starter relay.
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Old 12-29-2016, 07:59 PM   #3
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Thanks for the update!
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Old 12-29-2016, 10:50 PM   #4
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Thanks for the update.

Too many times on here people don't come back on and tell us what fixed their problem.
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Old 12-31-2016, 04:17 PM   #5
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Quote:
Originally Posted by ScoobyMike View Post
For anyone searching this problem in the future, it was a bad starter relay.
Thanks for the feedback. It's contributions like this that make this forum #1 to identify Workhorse problems and owner applied solutions.
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Old 01-01-2017, 06:38 PM   #6
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I am pretty sure this problem started a year or so ago when I tried to start the engine on low batteries. The low voltage drove high current that welded the starter solenoid closed. Lesson learned, if batteries are low, stop cranking immediately!
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Old 01-01-2017, 06:42 PM   #7
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Thank you for the update they are important for those who may do a search of the subject in the future.

It's good to read you got it solved.
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Old 01-01-2017, 10:23 PM   #8
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Originally Posted by ScoobyMike View Post
I am pretty sure this problem started a year or so ago when I tried to start the engine on low batteries. The low voltage drove high current that welded the starter solenoid closed. Lesson learned, if batteries are low, stop cranking immediately!
I see you have learned that lesson well. The first and best diagnostic toward 12 volt problems is knowing that a charged set of batteries is in place with adequate operational voltage and a 100% effective ground.
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