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Tahoe / Yukon Service Manual

Symptoms - Active Grille Air Shutter

  1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to Active Grille Air Shutter Description and Operation. Visual/Physical Inspection Inspect for aftermarket devices which may affect the operation of the system. Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections. Symptom List Active Grille Air Shutter 1 Malfunction Active Grille Air Shutter 2 Malfunction