07 freightliner century showing fault code Sht Lo 128 257 04?

Question

Check engine light stays on, truck run normal!

Answer 1

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there is a big truckers site called " truckers report " go there and ask people that own them . more likely you get an answer there than here.

Answer 2

Are you using your regen frequently? That was the code that came up when my filter for the regen was dirty and it wasn't working properly.