Throttle Valve Position Control Throttle Stuck Temporarily


Table of contents

P1638 BMW Possible Causes

  • Faulty Electromotive Throttle Actuator
  • Electromotive Throttle Actuator harness is open or shorted
  • Electromotive Throttle Actuator circuit poor electrical connection

How do I fix code P1638 BMW?

  Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

Tech Notes

  • BMW Diagnostic Trouble Code (DTC): 100001

Cost of diagnosing the P1638 BMW code

  The cost of diagnosing the P1638 BMW code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1638 BMW Description

  The Electromotive Throttle Actuator is attached to the intake plenum and adjusts the throttle valve. The air supply to the engine is modified by adjusting the throttle valve. The Digital Motor Electronics (DME) calculates the position of the throttle valve using the following information: Position of the accelerator pedal and Torque request from other control units.
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 %.

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