okay guys lets rally this one....few weeks ago everything cool...was getting 300-330 per tank of fuel....got new tires same size as before (285/75/16) on stock rims and no lift....drove to indiana...mileage went to 250 per tank....no codes nothing....well was driving forty miles and abs and park brake light go on..with service brake system....pulled codes and got c0055. bought a new speed sensor....so do i need a to get abs module rebuilt now....what about the horrible fuel mileage. thanks in advance.
speed sensor is the root of all your problems. Computer reads truck speed via speed sensor to tell abs in event of panic stop how much brake force to apply, also speed sensor and air flow and or map sensor to adjust fuel and air ratio. So once you install sensor and clear codes you should go back to normal. Atleast it did with my truck last year. Same problems same symptons.
2011 White LTZ
LML CC 4x4 Z71
2007.5 LMM CC 4x4 new toy
2006 Black LBZ crew cab - Stolen 10/10/15
Gone but not forgotten