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OBD error code P0639 troubling you? Can’t understand what it means and how it relates to your vehicle’s fall in engine performance? Well, error code P0639 is concerned with Bank 2 throttle actuator control performance/range issues. It is a generic error code and applies to all OBD-II vehicles. To know more about this error code, have a look at the sections below.

Here, you need to know the fact that control modules mostly include the transmission control module, the body control module, the anti-lock brake control module, the instrument panel control module, the fuel injection control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, and the climate control module. Your vehicle’s PCM will set this error code P0639 when it detects that there are some problems with the throttle actuator control Bank 2. Here bank 2 indicates to the engine’s bank that is missing cylinder 1. To know more about this code and its causes, have a look at the section below.

What causes this problem with the Throttle Actuator Control Range/Performance (Bank 2)?

• Problems with the pedal position sensor
• Issue some throttle position sensor
• Bad throttle actuator motor
• Problems with the throttle body wiring harness due to it being dirty
• Bad throttle body connection (loose or dirty)
• Issues with the powertrain control module

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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0639 here:

Common Symptoms

• Decline in the engine performance
• Flashing of check engine light or malfunction indicator lamp (might skip in some cases)
• Problems while accelerating such as hesitation

Want to correct the Trouble Code P0639? Read these points mentioned below:

• Undergo faulty or damaged throttle wirings, connectors & other components replacements
• Undergo throttle actuator motor replacement, if found faulty
• Undergo throttle body replacement completely, if found faulty
• Replace the pedal position sensor if necessary
• Replace, repair or reconnect loose, corroded or damaged electrical connectors
• If you come across any defective wiring within the CAN bus harness, then undergo its replacement

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0639 code to be stored:

• To begin the diagnosis, conduct a careful visual inspection of all the related throttle actuator control wirings, connectors and components. Next step involves clearing the trouble codes and retesting the systems after you conduct the repairs to be sure of being successful. In case you feel after the visual inspection that all the wirings, connectors are operating well, then download the freeze frame data and all stored codes for further analysis.
• Now, clear all the codes and conduct a test drive. Make sure of the fact that this error code P0639 occurs only with the electronically controlled throttle body equipped vehicles. Also test for the voltage between the throttle actuator control motor connectors and the powertrain control module. If you do not detect any voltage or ground signal, then disconnect the PCM from the connectors and test each and every circuit for any resistance or continuity.
• You can assume a faulty motor if you discover a voltage and ground signal at the throttle actuator motor connector. Undergo the necessary repairs and then conduct a test drive to see if the code returns. In case it persists then use a diagnostic scanner and CAN Bus system wiring diagram to check for the pins of the CAN Bus harness. Also install a memory-saving device to avoid any PCM and control module memory loss.
• Once you are done with all the repairs, clear the code and then conduct a test to see if the code returns.

Common Mistakes When Diagnosing the P0639 Code

In order to avoid any misdiagnosis, make sure that you do not treat the symptoms and codes stored in reaction to the storage codes. The best way to treat this code is by downloading the freeze data and then treating it. 

P0638 - Throttle Actuator Control Range/Performance (Bank 1)