Symptoms - Hybrid Controls. GMC Truck Yukon

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2008 🢒 Yukon - 4WD 🢒 Body Systems 🢒 Adjustable Pedals 🢒 Symptoms - Hybrid Controls

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 operation in order to familiarize yourself with the system functions.

Refer to the following procedures:

•	Drive Motor Generator Control Module Description and Operation

•	High Voltage Monitoring Systems Description

•	Hybrid Modes of Operation Description

•	Drive Motor Battery System Description

•	Transmission General Description

•	Inspect for aftermarket devices which could affect the operation of the Hybrid System. 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 to Testing for Intermittent Conditions and Poor Connections .

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

•	Engine Will Not Crank

•	Engine Does Not AutoStop