P0638 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0638 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0638 code.

What Does P0638 Code Mean?

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.

P0638 Symptoms

• Decreased engine performance

Common Problems That Trigger the P0638 Code

• Powertrain Control Module (PCM) failure
• Throttle body assembly failure
• Wiring issue