Engine Cranks Slowly

Perform the following checks:

• Battery - Battery Inspection/Test. Refer to Battery Inspection/Test (Non-HP2)  or Battery Inspection/Test (HP2) .
• Wiring - Inspect the wiring for damage. Inspect all connections to the starter motor, solenoid, battery, and all ground connections. Refer to Circuit Testing , Wiring Repairs , Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
• Engine - Make sure the engine is not seized. Refer to Symptoms - Engine Mechanical .

If the battery, the wiring and the engine are functioning properly and the engine continues to crank slowly, replace the starter motor. Refer to Starter Motor Replacement (4.3L Engine) , Starter Motor Replacement (4.8L, 5.3L, and 6.0L Engines) , Starter Motor Replacement (8.1L Engine) or Starter Motor Replacement (6.6L (LLY) Engine) .