Throwing Codes

[BuiltMFG]

I plugged in my OTC HD and have about 7 codes that need diagnosing. Is there any resource that I can use for help?


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[Suprman]

Engine codes should be standard Cat codes the A1 trucks have normal Cat ecm.

 

[TNriverjet]

Heres a thread (post #15) that has info on Allison codes

http://www.steelsoldiers.com/showth...d-shift-from-4th-to-5th/page2&highlight=codes

I'm also trying to post the PDF here, but not sure that will work.
View attachment Codes20Allison201000202000.pdf