Symptoms - Antilock Brake System. GMC Truck TopKick C-Series (Conventional) C6/C7/C8 2006

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2006 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 General Information 🢒 Vibration Diagnosis and Correction 🢒 Symptoms - Antilock Brake System

Important: The following steps must be completed before using the symptom tables.

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.

Review the system description and operation in order to familiarize yourself with the system functions. Refer to ABS Description and Operation .

•	Inspect for aftermarket devices which could affect the operation of the Antilock Brake System (ABS). Refer to Checking Aftermarket Accessories .

•	Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

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

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

•	ABS Indicator Always On

•	ABS Indicator Inoperative

•	Low Traction Indicator Always On

•	Low Traction Indicator Inoperative

•	Traction Off Indicator Always On

•	Traction Off Indicator Inoperative