A Symptoms

IMPORTANT: The following steps must be completed before using the symptoms table.

1. Perform the Diagnostic System Check - Cruise Control 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. Diagnostic System Check - Cruise Control
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Cruise Control Description and Operation (w/o ETC) or Cruise Control Description and Operation (w/ETC) or Cruise Control Description and Operation (Diesel).

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the Cruise Control System. Refer to Checking Aftermarket Accessories in Diagnostic Aids.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ Cruise Control Indicator Always On
^ Cruise Control Indicator Inoperative
^ Cruise Control Inoperative/Malfunctioning (4.3L, 4.8L, 5.3L, 6.OL WO/ETC) or Cruise Control Inoperative/Malfunctioning (6.0L, 8.1L W/ETC) or Cruise Control Inoperative/Malfunctioning (Diesel) Cruise Control Indicator Always On.

For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application RPO Codes