Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
The diagnostic trouble codes are displayed on the three transfer case shift select buttons. The Shift select buttons are located on the instrument panel. When connector pin 13 on the data link cable is grounded, and the ignition switch has been off for at least five seconds prior to positioning the ignition switch to run, the shift select buttons will blink various times together to indicate diagnostic trouble codes from 1 to 4.