P0639 Fault Code

Throttle Actuator Control Range/Performance (Bank 2)

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0639 fault code indicates a problem with the throttle actuator control range or performance specifically for bank 2 of the engine. This code typically points to issues with the electronic throttle control system that can impact the air intake and engine performance.

• The throttle actuator is responsible for regulating the airflow into the engine, ensuring optimal combustion and power output.
• When the system detects that the throttle position is not within the expected range or is not performing as it should, this code is triggered.

What are the symptoms of the P0639 code?

Drivers may notice various symptoms when the P0639 fault code is present, including:

• Check Engine Light illuminated on the dashboard
• Reduced engine performance or power loss
• Erratic or unexpected throttle response
• Engine stalling or hesitation during acceleration
• Difficulty in maintaining a steady speed

What causes the P0639 code?

There are several potential causes for the P0639 fault code, including:

• Faulty throttle actuator or motor
• Damaged or corroded wiring in the throttle control circuit
• Issues with the engine control module (ECM) or powertrain control module (PCM)
• Vacuum leaks in the intake system
• Throttle body issues such as carbon buildup or mechanical obstruction

How to fix P0639?

To resolve the P0639 fault code, follow these steps:

• Use an OBD-II scanner to confirm the error code and other related codes that may be present.
• Inspect the throttle actuator and its wiring for any signs of damage or corrosion and replace if necessary.
• Clean the throttle body to remove any carbon deposits that may be impeding its performance.
• Check for vacuum leaks in the intake system and repair as needed.
• If the problem persists, a reprogramming of the ECM/PCM may be required or replacement of the unit if it is malfunctioning.