Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Start the engine.

Does the starter operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Start the engine while listening to the starter motor turn.

Is there a loud "whoop", that may sound like a siren if the engine is revved while the starter is engaged, after the engine starts, but while the starter is still held in the engaged position?

Go to Step 6

Go to Step 4

Do you hear a "rumble", a "growl", or, in some cases, a "knock" as the starter is coasting down to a stop after starting the engine?

Go to Step 7

Go to Step 5

Important: This is often diagnosed as a starter drive gear hang-in or a weak solenoid.

When the engine is cranked, do you hear a high-pitched whine after the engine cranks and starts normally?

Go to Step 8

Go to Step 7

Inspect the flywheel ring gear for the following:

Is the flywheel bent, or does it have damaged teeth?

Go to Step 8

Go to Step 7

1. Remove the starter motor. Refer to Starter Motor Replacement .
2. Inspect the starter motor bushings and clutch gear.

Does the clutch gear have chipped or milled teeth or worn bushings?

Go to Step 9

Go to Step 10

Replace the flywheel. Refer to Engine Flywheel Replacement in Engine Mechanical - 6.0L (LS2)

Did you complete the replacement?

Go to Step 10

--

Replace the starter motor. Refer to Starter Motor Replacement .

Did you complete the replacement?

Go to Step 10

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3