P0638 Mercedes-Benz Code - Throttle Actuator Control Range/Performance Bank 1
Quick Answer
This fault code is stored in the engine control module when a fault is detected with the throttle positioner motor. Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection. 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 Mercedes-Benz indicates Throttle Actuator Control Range/Performance Bank 1.
- Common causes
- Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection.
- 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 Mercedes-Benz Description
What are the Possible Causes of the DTC P0638 Mercedes-Benz?
- Faulty Accelerator Pedal Position Sensor
- Accelerator Pedal Position Sensor harness is open or shorted
- Accelerator Pedal Position Sensor circuit poor electrical connection
- Faulty Throttle Positioner Motor
How to Fix the DTC P0638 Mercedes-Benz?
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
Mercedes Benz Code = 0194 (Throttle valve actuator): Mechanical fault (P0638)
Mercedes Benz Code = 0212 (Throttle valve actuator): The component was replaced without performing throttle valve adaptation (P0638)
Mercedes Benz Code = 0228 (Throttle valve actuator): Throttle valve jamming (iced up) (P0638)
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0638 Mercedes-Benz 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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Frequently Asked Questions about P0638 Mercedes-Benz Code
1. What are the common symptoms of OBDII code P0638 in a Mercedes-Benz related to the Throttle Actuator Control Range/Performance Bank 1?
- Common symptoms include reduced engine power, poor acceleration, and the vehicle going into limp mode.
2. What are the possible causes of OBDII code P0638 in a Mercedes-Benz indicating an issue with the Throttle Actuator Control Range/Performance Bank 1?
- Possible causes include a faulty throttle actuator, wiring issues, electronic control unit (ECU) problems, or a failed throttle position sensor.
3. How can I diagnose OBDII code P0638 in my Mercedes-Benz if it points to a Throttle Actuator Control Range/Performance Bank 1 problem?
- Diagnosis typically involves conducting a thorough inspection of the throttle actuator, checking the wiring for any damage, and using a diagnostic scan tool to retrieve specific fault codes.
4. Is it safe to continue driving my Mercedes-Benz with OBDII code P0638 related to the Throttle Actuator Control Range/Performance Bank 1?
- It is not recommended to drive the vehicle with this code as it can lead to performance issues and potentially unsafe driving conditions.
5. How should I proceed with repairing OBDII code P0638 in my Mercedes-Benz indicating a Throttle Actuator Control Range/Performance Bank 1 malfunction?
- The repair process usually involves replacing the faulty throttle actuator, repairing any damaged wiring, or reprogramming the ECU as necessary.
6. Can a DIY enthusiast attempt to fix OBDII code P0638 related to the Throttle Actuator Control Range/Performance Bank 1 in a Mercedes-Benz?
- Due to the complexity of the throttle system and the importance of proper diagnosis, it is recommended to have a professional technician handle the repair.
7. Are there any preventive maintenance tips to avoid encountering OBDII code P0638 in a Mercedes-Benz linked to Throttle Actuator Control Range/Performance Bank 1 issues?
- Regularly servicing the throttle system, ensuring proper wiring connections, and using high-quality fuel can help prevent potential issues leading to this code.
8. How long does it typically take to repair OBDII code P0638 in a Mercedes-Benz associated with Throttle Actuator Control Range/Performance Bank 1 problems?
- The repair time can vary depending on the exact cause of the issue, but it usually takes a few hours to a full day to diagnose and fix the problem.
9. What are the potential risks of ignoring OBDII code P0638 related to the Throttle Actuator Control Range/Performance Bank 1 in a Mercedes-Benz?
- Ignoring this code can lead to further damage to the throttle system, decreased fuel efficiency, and potential safety hazards while driving.
10. Can resetting the OBDII system clear OBDII code P0638 in a Mercedes-Benz associated with Throttle Actuator Control Range/Performance Bank 1?
- While resetting the system may temporarily clear the code, it is important to address the underlying issue causing the fault code to prevent it from reoccurring.
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