Diagnostic Tests: Notes

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 1999 GMC Suburban, 1999 GMC Savana Special, 1999 GMC Savana Camper Special, 1999 GMC Savana, and 1999 GMC Pickup. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before clearing DTCs, record FREEZE FRAME and FAILURE RECORDS for reference during testing. Data will be erased when DTCs are cleared.

NOTE: If PCM is replaced, NEW PCM must be programmed using special equipment.

NOTE: Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM before proceeding with DIAGNOSTIC TESTS.