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Engine-Codes – BMW – P1638 BMW

P1638 BMW Code - Throttle Valve Position Control Throttle Stuck Temporarily

Quick Answer

The P1638 BMW code indicates an issue with the throttle valve position control, specifically that the throttle is stuck temporarily. Common causes include Faulty throttle position sensor, Dirty throttle body, Damaged throttle valve. 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
P1638 BMW indicates Throttle Valve Position Control Throttle Stuck Temporarily.
Common causes
Common causes include Faulty throttle position sensor, Dirty throttle body, Damaged throttle valve.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1638 BMW Description

The P1638 BMW code indicates an issue with the throttle valve position control, specifically that the throttle is stuck temporarily. The throttle valve controls the amount of air that enters the engine, which is crucial for proper combustion and engine performance. When the throttle valve is stuck temporarily, it can lead to a variety of problems with the vehicle's performance.

OBDII Code P1638 BMW - Throttle Valve Position Control Throttle Stuck Temporarily
P1638 BMW Code - Throttle Valve Position Control Throttle Stuck Temporarily

Common Causes of P1638 BMW

  1. Faulty throttle position sensor
  2. Dirty throttle body
  3. Damaged throttle valve
  4. Issues with the throttle control module
  5. Electrical or wiring issues

Symptoms of P1638 BMW

  1. Erratic idling
  2. Stalling
  3. Hesitation during acceleration
  4. Decreased engine power
  5. Limp mode activation

How to Fix P1638 BMW

  1. Inspect the throttle valve position sensor and replace if necessary.
  2. Clean the throttle body to ensure smooth operation.
  3. Check the throttle valve for damage and replace if needed.
  4. Scan the throttle control module for any error codes and address as required.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1638 BMW

The cost of repairing a throttle valve position control throttle stuck temporarily code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that rates at auto repair shops can vary, so it's best to get a quote from a few different shops to find the best price.

What does this mean?

Tech Notes for P1638 BMW

BMW Diagnostic Trouble Code (DTC): 100001

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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 P1638 BMW Code

1. What does the OBDII code P1638 mean on a BMW?

P1638 indicates "Throttle Valve Position Control Throttle Stuck Temporarily," meaning there is an issue with the throttle body or its control system.

2. What are the common symptoms of code P1638 in a BMW?

Symptoms may include poor acceleration, hesitation, reduced engine power, rough idling, and the Check Engine Light turning on.

3. What causes the P1638 code to appear on a BMW?

Common causes include carbon buildup in the throttle body, a malfunctioning throttle actuator, issues with the throttle position sensor, or wiring problems in the throttle control circuit.

4. Can I drive my BMW with the P1638 code?

While you may be able to drive the car, it is not recommended as the issue could worsen and lead to unsafe driving conditions or further damage.

5. How can I fix the P1638 code on my BMW?

Repairs may involve cleaning the throttle body, inspecting and repairing wiring or connectors, recalibrating the throttle control module, or replacing faulty components like the throttle actuator.

6. Is code P1638 related to the throttle position sensor?

Yes, issues with the throttle position sensor, such as incorrect readings or electrical faults, can trigger the P1638 code.

7. Does the P1638 code require throttle body replacement?

Not necessarily; often, cleaning the throttle body or addressing electrical issues can resolve the problem. Replacement is needed only if the throttle body is irreparably damaged.

8. How much does it cost to fix the P1638 code on a BMW?

Costs can vary widely depending on the specific issue, ranging from $50 to $500, with cleaning or repairs being cheaper than replacing parts.

9. Can a software update fix the P1638 code on a BMW?

In some cases, a software update or recalibration of the throttle control module may resolve the issue, especially if the problem is related to incorrect programming.

10. How can I prevent the P1638 code from appearing again?

Regular maintenance, such as cleaning the throttle body, ensuring proper connections, and addressing issues promptly, can help prevent recurrence.

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