P0638 P0638 code definition This diagnostic power train code represents a problem happening with the vehicle’s throttle actuator control (https://www.yourmechanic.com/article/throttle-actuator-control-throttle-body-range-performance-by-robert-kulp) (https://www.yourmechanic.com/article/throttle-actuator-control-throttle-body-range-performance-by-robert-kulp) range in bank one. What the P0638 code means In many newer model vehicles, the throttle body is hooked...
