Diagnostic Aids

Check for deformed connections at pass-thru connector. DTC 68 will set when transmission defaults to 2nd gear. An intermittent incorrect engine speed signal will set DTC 68 if incorrect signal lasts for greater than 2 seconds. A mechanical failure in solenoid "A" (1-2 shift solenoid stuck off) or solenoid "B" (2-3 shift solenoid stuck on) could set DTC 68.

Fig 1: DTC 68 Schematic - 1994

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC 68 Flow Chart - 1994

Courtesy of GENERAL MOTORS CORP.