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P1638 Diagnostic Trouble Code Discussion for June 2006

TCM Internal - CAN 1 RAM Performance

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Trouble Ticket Help Requests for DTC P1638
Help Request Posted
2001 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 2GCEC19V21
P1638: Generator 'F' Terminal Circuit Malfunction. I am posting this for a friend that is thinking about a membership.This vehicle will set a p0440 code as soon as it runs the evap monitor.The system appears to hold vacuum as it was tested with a vacuum pump.Don't know if the alt codes are related or not.Thank...
June 22, 2006