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Code

P0638

Throttle

Throttle actuator control range / performance

The electronic throttle could not reach the commanded position.

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Most likely causes

Carbon in throttle body
Faulty throttle motor
Wiring fault

Symptoms you may notice

Check engine light
Limp mode
Poor throttle response

Checks to run

Clean the throttle body
Read the throttle angle live
Test the actuator

Tools you may need

Throttle cleaner OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Throttle

Throttle position sensor / pedal circuit malfunction

Throttle position sensor range / performance problem

Throttle position sensor B circuit malfunction

Throttle actuator control motor circuit range / performance

Throttle / pedal position sensor D circuit low

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