Diagnostic Aids

Check for spread connectors at pass-thru connector. Code 68 will set when going to default (2nd gear). Refer to TESTS W/O CODES article.

Fig 1: CODE 68, Schematic, Overdrive Ratio Error

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 68, Flow Chart, Overdrive Ratio Error

Courtesy of GENERAL MOTORS CORP.