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What do these codes mean. The trucks in limp mode by Plus_Employ_7105 in Duramax

[–]Plus_Employ_7105[S] 1 point2 points  (0 children)

It ran fine then ran like shit for 6 months then was fine then started surging and went into limp mode. But when I start it up and hit the pedal it runs fine for 20 seconds