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P0638 Diagnostic Trouble Code Discussion for April 2014

Throttle Actuator Control Range/Performance

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Trouble Ticket Help Requests for DTC P0638
Help Request Posted
2001 Volkswagen Jetta GL 2.0L Poor Idle Quality, Hesitation, MIL Lamp on
P0638: throttle actuator control range/performance. ... raises idle. sets code p0638.also had codes,p1564 under voltage, and p0507 idle high. only returning code now is p0638.recent repairs include, m.a.f. sensor. m.a.f. harness, fuel pump relay, battery, v.w.throttle body. adapt throttle a few times always acc...
April 16, 2014