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P0638 Diagnostic Trouble Code Discussion for December 2013

Throttle Actuator Control Range/Performance

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Trouble Ticket Help Requests for DTC P0638
Help Request Posted
2005 Cadillac STS 4.6L Surge, Stall VIN: 1G6DC67A95
P0638: Throttle Actuator Control Command Performance. ... intermitent surge then stall when hot.The surge is quite abrupt and idle speed varies from 300 t0 700 rpm 2 or 3 times then stalls.If you restart it will repeat the surge and stall. If you shut it down , then restart it will run for a minute or 2 before st...
December 03, 2013
2003 Saab 9-3 Arc 2.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: YS3FD49Y03
P0638: throttle mechanical position deviation from demanded. ... not have a tech2 and out launce will not communicate. generic obd shows tps at 28% always. has no throttle response. Identafix and alldata say no diagnostic info for code p1681. replace ecm...
December 26, 2013