P1638 BMW Code - Throttle Valve Position Control Throttle Stuck Temporarily
Quick Answer
The Electromotive Throttle Actuator is attached to the intake plenum and adjusts the throttle valve. Common causes include Faulty Electromotive Throttle Actuator, Electromotive Throttle Actuator harness is open or shorted, Electromotive Throttle Actuator 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
- P1638 BMW indicates Throttle Valve Position Control Throttle Stuck Temporarily.
- Common causes
- Common causes include Faulty Electromotive Throttle Actuator, Electromotive Throttle Actuator harness is open or shorted, Electromotive Throttle Actuator 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 P1638 BMW Description
The Digital Motor Electronics opens or closes the electromotive throttle actuator electrically. The throttle valve opening angle in the electromotive throttle actuator is monitored by 2 hall effect sensors. The throttle valve is moved by an electric actuator motor. This servomotor is actuated by a pulse-width modulated signal with a frequency of 1000 Hz.
The Digital Motor Electronics diagnosis monitors the throttle valve for freedom of movement. The Diagnostic Trouble Code (DTC) is recognized when the pulse-width modulated signal for activating the throttle valve is above 80 %.
What are the Possible Causes of the DTC P1638 BMW?
- Faulty Electromotive Throttle Actuator
- Electromotive Throttle Actuator harness is open or shorted
- Electromotive Throttle Actuator circuit poor electrical connection
How to Fix the DTC P1638 BMW?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1638 BMW 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 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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