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EEC 61 means there is a code in the aftertreatment system. ECU1 means it is the first code. Try pressing your diag screen buttons to get to the diagnostic info to get the rest of the code. The truck is expected to go into limp mode when you get a aftertreatment code.
If I can get the rest of the code, I can advise on that it is as well. It will have a spn and fmi number with it.
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