Diagnostic Aids

Check for spread connectors at pass-thru connector. Code 68 will set when going to default (2nd gear). If code is intermittent, see INTERMITTENTS in TESTS W/O CODES article in this section.

Fig 1: CODE 68, Schematic, Overdrive Ratio Error

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE 68, Flowchart, Overdrive Ratio Error

Courtesy of GENERAL MOTORS CORP.