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Just wondering if anyone knows if you can rewrite a 06 cummins ecm?

Hi, I have an 06 cummins. About a year ago the front and rear banks started dropping out at random times. Codes were p2146 and p2149. When a bank would drop out it didnt last long, even if it did, when you shut it off and start it again it would act fine. Making it really difficult to test. Now...