Section 1 (Engine Controls Tests W/Codes - Diesel): Summary
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.
If no hard fault codes are present, driveability symptoms exist or intermittent DTC(s) exist, proceed to appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.