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Old 03-02-2020, 07:56 PM   #1
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Diagnostic codes

Have a 2001 Thomas freight liner with 24 valve 5.9 Cummins. Getting a 278 code when it is cold then after running get 381 code. Does anyone have a link to what the codes are. I have googled everything and found codes, but these are not on list. Thanks for help!!!
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Old 03-02-2020, 10:39 PM   #2
Mini-Skoolie
 
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Location: Central Alabama
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Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
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What about ISB Fault Codes List
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Old 03-02-2020, 11:22 PM   #3
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Heck yeah thank you!!! It had both codes on there. So I have a lift pump circuit issue and air intake heater relay circuit issue. Lift pump is going to be my issue.
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Old 03-02-2020, 11:33 PM   #4
Mini-Skoolie
 
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Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
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Many ISB's around that year model had a an issue which dealt with the lift pump. Search for Cummins campaign 0504, bulletin 4907663 for more information.
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Old 04-10-2020, 10:55 PM   #5
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Hey guys.

I just got a 2005 Thomas built bus. 5.9 24v. I drove it over 100 miles from where I bought it from to my house. Ran great! I've been running it for about 10 minutes a day while I'm working on the conversion just at idle. I noticed the warning light on the dash was on as well as the stop light. I'm unfamiliar with the built in engine diagnostic fault codes. I'm unable to find accurate fault list that correspond with my bus. Can anyone point me in the right direction? Thanks!
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Old 04-11-2020, 05:05 AM   #6
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http://www.diesel-service-parts.com/isb-fault-codes.html
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Old 04-11-2020, 05:07 AM   #7
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ISB Fault Codes List
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Old 04-12-2020, 01:53 AM   #8
Skoolie
 
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Year: 2001
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Quote:
Originally Posted by Joejoe View Post
I just got a 2005 Thomas built bus. 5.9 24v. I drove it over 100 miles from where I bought it from to my house. Ran great! I've been running it for about 10 minutes a day while I'm working on the conversion just at idle. I noticed the warning light on the dash was on as well as the stop light. I'm unfamiliar with the built in engine diagnostic fault codes. I'm unable to find accurate fault list that correspond with my bus. Can anyone point me in the right direction? Thanks!
Don’t run the engine till you get the stop light figured out. I think there’s a way to get the dash lights to flash the code in a certain way but I can’t remember off hand how. Alternately you could buy a code reader and see if it can find them; sometimes you need the special Cummins software to get all the codes I think.
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Old 04-12-2020, 08:32 AM   #9
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There's a reason for the stop engine light, intended to prevent major engine damage until a problem is corrected. Usually low oil pressure or over temperature - low coolant level will often activate it too.
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