Same as on all new cars -- attach an OBD-II compliant code reader to the OBD-II socket, located on the lower left of the dash, and read the codes.
A scan tool is required to read the trouble codes.
Not very likely, as there is no such thing as a 2005 Pontiac Trans Am.
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There are trouble codes in the computer systems. You need to have the PCM, ABS, etc checked for codes to know possible causes.
Pontiac Torrent was created in 2005.
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Transmission code present. You need to check the TCM for codes to know possible causes.
The transmission is 100% computer controlled. If you are having a shifting issue you need to have the system checked for trouble codes.
The Pontiac G5 was first introduced in 2004 for the 2005 model year. For 2005 and early 2006, this car was known as the Pontiac Pursuit in the Canadian market, and G5 Pursuit during mid-2006. It was also known as the Pontiac G4 in Mexico from 2005-2006 -- source:wikipedia--pontiac g5