Diagnostic Starting Point - Automatic Transmission: Symptoms

WARNING: This page is about a different car, the 2003 GMC Yukon XL, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

When it has been determined through DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in Engine Controls - 6.OL or DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in Engine Controls - 8.1L that no DTCs are present, begin symptom diagnosis by reviewing the TRANSMISSION COMPONENT AND SYSTEM DESCRIPTION . Reviewing TRANSMISSION COMPONENT AND SYSTEM DESCRIPTION information enables you to understand the operation of the system. This helps you determine if the condition described by the customer is normal or if a malfunction exists. If it is determined that a malfunction exists, identify the concern by referring to the SYMPTOMS - AUTOMATIC TRANSMISSION table. The SYMPTOMS - AUTOMATIC TRANSMISSION table provides common diagnostic categories which relate directly to diagnostic information or procedures.