Throttle Actuator Control Range/Performance (Bank 2)
Code P0639 indicates that the Powertrain Control Module (PCM) has detected a malfunction in the throttle actuator control system for Bank 2. This typically means the throttle position sensor or actuator is not responding correctly, or the actual throttle position does not match the commanded position. Bank 2 refers to the side of the engine opposite cylinder #1. This can cause reduced engine power, poor acceleration, and potential stalling.
01. Most Common Causes
- Faulty throttle actuator control motor
- Wiring or connector issues in the throttle actuator circuit
- Malfunctioning throttle position sensor
- Carbon buildup on throttle body
- PCM software or hardware failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Engine stalling or rough idle
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P0639 and check for related codes.
Step 2: Visually inspect the throttle actuator wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the throttle actuator motor and position sensor with a multimeter per manufacturer specifications.
Step 4: Clean the throttle body if carbon buildup is suspected.
Step 5: If all else fails, reprogram or replace the PCM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause sudden loss of throttle control, leading to unsafe driving conditions. You may experience reduced power or stalling.
How much does it cost to fix?▼
The cost to fix P0639 typically ranges from $50 to $150 for diagnostic and cleaning, but could be higher if parts like the throttle actuator or PCM need replacement.