Have a 2014 Cascadia. Forgot to treat my fuel in cold weather. Not the motor skips and derates. Check engine light comes on when the truck derates. Turbo boost engages when extra demand for fuel exist. When going down a hill the boost turns off and the check engine light goes off and truck runs fine till demand for extra fuel again. Changed fuel filters twice. Been treating the fuel and replaced air filter. Any advice would be useful.
DD15 dereate
Discussion in 'Freightliner Forum' started by Edward01222, Feb 17, 2022.
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