P0638Medium SeverityElectrical

Throttle Actuator Control Range/Performance (Bank 1)

What This Means

The throttle actuator control range/performance (bank 1) has been detected. This relates to the PCM internal programming or actuator control.

Common Symptoms

Check engine light on
Charging system warning
System malfunction
Reduced functionality

Common Causes

PCM programming error
Module failure
Wiring issue
Communication error
Internal component failure

Estimated Repair Cost

$100 – $1500

Parts and labor (varies by vehicle and location)

Difficulty:Professional

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.