Hey all.... hoping someone can help me out with this one....... 08 Pete 389 Tri axle, my check engine light is coming on when I use the engine brake. the engine brake is working the same, so I am not sure why this is happening....looking for input before having to take it to Peterbilt... Thanks
Check Engine Light
Discussion in 'Peterbilt Forum' started by JerseyShoreTrucker, Feb 24, 2017.
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