P0638 Code - Throttle Actuator Control Range/Performance Bank 1
Quick Answer
The diagnostic trouble code P0638 indicates a problem with the throttle actuator control system in Bank 1. Common causes include Faulty throttle actuator control module, Wiring or electrical issues in the throttle actuator circuit, Dirty or faulty throttle body. 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 indicates Throttle Actuator Control Range/Performance Bank 1.
- Common causes
- Common causes include Faulty throttle actuator control module, Wiring or electrical issues in the throttle actuator circuit, Dirty or faulty throttle body.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0638 Description
The diagnostic trouble code P0638 indicates a problem with the throttle actuator control system in Bank 1. This code typically means that the Engine Control Module (ECM) has detected that the actual throttle position does not match the expected position based on input from other sensors. This discrepancy can lead to poor engine performance, reduced fuel efficiency, and potentially even engine stalling. The throttle actuator control system is responsible for regulating the air intake into the engine, which directly affects its performance. If left unresolved, this issue can lead to further damage to the engine and other components.
Common Causes of P0638
- Faulty throttle actuator control module
- Wiring or electrical issues in the throttle actuator circuit
- Dirty or faulty throttle body
- Vacuum leaks in the intake system
- ECM software issues
Symptoms of P0638
- Engine hesitation or stumbling
- Reduced engine power
- Difficulty accelerating
- Check Engine Light illuminated
- Rough idle
How to Fix P0638
- Diagnose the issue using a scan tool to confirm the P0638 code and check for any other related codes.
- Inspect the throttle actuator control module and wiring for any visible damage or corrosion.
- Clean the throttle body to remove any carbon buildup or debris that may be affecting its operation.
- Check for vacuum leaks in the intake system and repair as necessary.
- If the issue persists, consider replacing the throttle actuator control module or addressing any ECM software issues.
Cost to Fix P0638
The cost of repairing a P0638 code can vary depending on the specific cause of the issue. In general, replacing a faulty throttle actuator control module can range from $200 to $500, while cleaning the throttle body or addressing wiring issues may cost around $100 to $300. Labor costs can add an additional $80 to $150 per hour, and diagnostic time may also be charged separately. It's recommended to consult with a professional mechanic to get a more accurate estimate based on your vehicle's make and model.
Tech Notes for P0638
Need more information about the P0638 code?
Need more information on how to fix the P0638 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0638 code diagnosed by a professional: Find a repair shop in your area
Code P0638 Information for Specific Makes
- P0638 Hyundai — Throttle Actuator Control Range/Performance
- P0638 KIA — Throttle Actuator Control Range/Performance
- P0638 Mazda — Throttle Actuator Control Range/Performance
- P0638 Mercedes-Benz — Throttle Actuator Control Range/Performance Bank 1
- P0638 MINI — Throttle Actuator Control Range/Performance
- P0638 Mitsubishi — Throttle Actuator Control Range/Performance
- P0638 Subaru — Throttle Actuator Control Range/Performance
- P0638 Suzuki — Throttle Actuator Control Range/Performance
- P0638 Volkswagen — Throttle Actuator Control Range/Performance
- P0638 Volvo — Throttle Actuator Control Range/Performance
Frequently Asked Questions about P0638 Code
1. What are the common symptoms of OBDII code P0638 (Throttle Actuator Control Range/Performance Bank 1)?
- Common symptoms include reduced engine performance, rough idle, stalling, and illuminated Check Engine Light.
2. What are the possible causes of OBDII code P0638?
- The code P0638 can be triggered by issues such as a faulty throttle actuator, damaged wiring or connectors, or a problem with the electronic throttle control system.
3. How can I diagnose the cause of OBDII code P0638?
- Diagnosis typically involves scanning the vehicle's computer for the specific error code, conducting a visual inspection of the throttle actuator and related components, and performing tests to check for proper voltage and signal outputs.
4. Can I drive my vehicle with OBDII code P0638?
- It is not recommended to drive with this code present, as it can lead to potential safety hazards and further damage to the vehicle if left unresolved.
5. What are some repair tips for fixing OBDII code P0638?
- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the throttle actuator if faulty, and resetting the throttle control system.
6. How much does it cost to repair OBDII code P0638?
- The cost of repair for OBDII code P0638 can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
7. Can a DIY enthusiast fix OBDII code P0638?
- While some minor repairs related to OBDII code P0638 can be done by experienced DIY enthusiasts, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.
8. How urgent is it to address OBDII code P0638?
- Addressing OBDII code P0638 promptly is recommended to prevent potential drivability issues and further damage to the vehicle's engine or throttle control system.
9. Is OBDII code P0638 a common issue in certain vehicle makes and models?
- OBDII code P0638 can be more common in vehicles with electronic throttle control systems, but it can potentially occur in any make or model that utilizes such technology.
10. Can resetting the vehicle's computer clear OBDII code P0638?
- Resetting the vehicle's computer may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear. It's important to address the root cause of the problem for a permanent solution.
Discuss the causes and fixes for P0638 OBDII Code
Code P0638 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.