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P0638 Severity
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
The engine computer (PCM) monitor the movement of the throttle body to verify that it matches its commanded position. If the throttle body fails to move as requested, code P0638 will be set.
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OBD-II Code P0638 is defined as a Throttle Actuator Control Range/Performance
The engine computer (PCM) monitor the movement of the throttle body to verify that it matches its commanded position. If the throttle body fails to move as requested, code P0638 will be set.