AutoCodes – Volvo – P0638 Volvo

P0638 Volvo Code - Throttle Actuator Control Range/Performance

Quick Answer

The Powertrain Control Module (PCM) compares the actual Throttle Possition (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: P0638 Volvo indicates Throttle Actuator Control Range/Performance.
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.

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Code Popularity 14,061

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 01, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0638 Volvo Description

The Powertrain Control Module (PCM) compares the actual Throttle Possition (TP) with the target TP when the engine is running. If the difference is more than the specification, the PCM determines that there is a throttle actuator control circuit range/performance problem.

OBDII Code P0638 Volvo - Throttle Actuator Control Range/Performance - AutoCodes.com — P0638 Volvo Code - Throttle Actuator Control Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0638 Volvo?

Drive-by-wire control system malfunction
Throttle actuator malfunction
Throttle valve malfunction
PCM malfunction

How to Fix the DTC P0638 Volvo?

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 does this mean?

Code Tech Notes

Dirty or clogged throttle body can triggered the P0638 code. Before replacing any parts try cleaning the throttle body and reset the engine light.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0638 Volvo 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.

Need more information about the P0638 Volvo code?

Need more information on how to fix the P0638 Volvo code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0638 Volvo Code

1. What are common symptoms of OBDII code P0638 in a Volvo related to Throttle Actuator Control Range/Performance?

- Common symptoms include rough idling, reduced engine power, stalling, and difficulty accelerating.

2. What are possible causes of OBDII code P0638 in a Volvo?

- Possible causes include a faulty throttle actuator, wiring issues, electronic throttle control module problems, or a malfunctioning throttle pedal sensor.

3. How can I diagnose the cause of OBDII code P0638 in my Volvo?

- Diagnosis typically involves using a scan tool to check for the specific fault code, inspecting wiring and connections related to the throttle actuator, and testing the throttle actuator itself for proper function.

4. Can I drive my Volvo with OBDII code P0638 present?

- It is not recommended to drive with this code present, as it can lead to unsafe driving conditions and potential further damage to the vehicle.

5. How can I repair OBDII code P0638 in my Volvo related to Throttle Actuator Control Range/Performance?

- Repair options may include replacing the throttle actuator, fixing any wiring issues, recalibrating the electronic throttle control system, or replacing the throttle pedal sensor.

6. Are there any DIY tips for addressing OBDII code P0638 in my Volvo?

- DIY tips may include checking for loose or damaged wiring, ensuring proper connections, and resetting the electronic throttle control system through a relearn procedure if applicable.

7. Is it necessary to reset the OBDII code P0638 after making repairs in my Volvo?

- Yes, it is important to clear the code using a scan tool after making any repairs to ensure the issue has been resolved and to prevent the code from reappearing.

8. Will OBDII code P0638 in my Volvo cause the check engine light to illuminate?

- Yes, this code typically triggers the check engine light to illuminate on the dashboard of your Volvo.

9. Can a faulty throttle actuator cause other OBDII codes to appear in my Volvo?

- Yes, a faulty throttle actuator can potentially cause other related codes to appear, so it is important to address the issue promptly to prevent further complications.

10. How much does it cost to repair OBDII code P0638 in a Volvo at a dealership or repair shop?

- The cost of repairs can vary depending on the specific diagnosis and parts needed, but it is recommended to consult with a professional for an accurate estimate.