P0638 Code - Throttle Actuator Control Range/Performance Bank 1
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 indicates Throttle Actuator Control Range/Performance Bank 1.
- 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 P0638 Description
What are the Possible Causes of the DTC P0638?
- Drive-by-wire control system malfunction
- Throttle actuator malfunction
- Throttle valve malfunction
- PCM malfunction
How to Fix the DTC P0638?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0638 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
- 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.
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