Recently, my Freightliner Cascadia check engine lights go on when I drive up the hill, also loses power and drives very slowly. When I change to low gear, the lights go off but the truck still moves very slowly. When I pass the hill and drive along a flat terrain, the truck moves at normal speed with no check-engine or other problem. Oil pressure is normal and MPG is normal. What could be a reason for the check engine lights on when I go up the hill?
Thank you very much in advance for any suggestion!
Freightliner Cascadia check-engine lights on when goes up the hill
Discussion in 'Experienced Truckers' Advice' started by Yursat, Sep 11, 2020.
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