Code 68, System Problem Using Tech 1: Notes

The PCM-integrated cruise control system is designed to monitor itself to ensure that the desired cruise position and actual cruise position are equal to each other. Code 68 will set when actual servo position sensor signal is 12 percent greater than desired servo position sensor signal for 1.5 seconds.

Fig 1: Code 68, Schematic, System Problem Using Tech 1

NOTE: Diagnosing Code 68 using this chart requires the use of the GM Tech 1 Bi-Directional Scan Tool.

Fig 2: Code 68, System Problem (Using Tech 1)