P0639 Code - Throttle Actuator Control Range/Performance Bank 2
Quick Answer
The Powertrain Control Module (PCM) compares the actual Throttle Position (TP) with the target TP when the engine is running. Common causes include Drive-by-wire control system malfunction, Throttle actuator malfunction, Throttle valve malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0639 indicates Throttle Actuator Control Range/Performance Bank 2.
- Common causes
- Common causes include Drive-by-wire control system malfunction, Throttle actuator malfunction, Throttle valve malfunction.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0639 Description
What are the Possible Causes of the DTC P0639?
- Drive-by-wire control system malfunction
- Throttle actuator malfunction
- Throttle valve malfunction
- PCM malfunction
How to Fix the DTC P0639?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0639 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0639 Mazda — Throttle Actuator Control Range/Performance
Frequently Asked Questions about P0639 Code
What does the OBD-II code P0639 mean?
The P0639 code indicates a problem with the throttle actuator control range or performance in Bank 2 of the engine, meaning the throttle system is not operating as expected.
What are the common symptoms of the P0639 code?
Symptoms may include reduced engine performance, poor throttle response, a lack of power, the check engine light turning on, and potentially the engine entering "limp mode."
What causes the P0639 code to appear?
Common causes include a faulty throttle actuator, damaged wiring or connectors, a malfunctioning throttle position sensor, or an issue with the engine control module (ECM).
Can I drive with the P0639 code active?
Driving with this code is not recommended as it can lead to poor performance, reduced fuel efficiency, and potential safety risks due to limited throttle control.
How do I diagnose the P0639 code?
Start by scanning for the code using an OBD-II scanner, inspecting the throttle actuator wiring and connectors for damage, and testing the throttle position sensor and actuator for proper operation.
What repairs can fix the P0639 code?
Repairs may include replacing the throttle actuator, repairing or replacing damaged wiring or connectors, recalibrating the throttle system, or in rare cases, reprogramming or replacing the ECM.
Is a faulty throttle position sensor a potential cause of the P0639 code?
Yes, a malfunctioning throttle position sensor can cause improper throttle actuator performance and trigger the P0639 code.
Does the P0639 code only affect Bank 2?
Yes, this code specifically refers to a throttle actuator performance issue in Bank 2, which typically involves the cylinder bank opposite to Bank 1 in V-shaped engines.
How much does it cost to repair the P0639 code?
Repair costs vary depending on the root cause, but replacing a throttle actuator typically ranges from $200 to $600, plus diagnostic and labor fees.
Can a dirty throttle body cause the P0639 code?
Yes, a dirty or clogged throttle body can restrict airflow and cause throttle actuator performance issues, potentially triggering this code.
Discuss the causes and fixes for P0639 OBDII Code
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