Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Hummer H3 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Battery, Charging System And Starting System
- Specifications
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Engine Electrical
- DTC B1327
- DTC B1390
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC B1420
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC B1487
- DTC B1488
- DTC B1492
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC B1516
- DTC B151B
- DTC B1566
- DTC C0899
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC C0901
- DTC P0562 (ECM)
- Diagnostic Instructions (ECM)
- DTC Descriptor (ECM)
- Diagnostic Fault Information (ECM)
- Circuit/System Description (ECM)
- Conditions for Running the DTC (ECM)
- Conditions for Setting the DTC (ECM)
- Action Taken When the DTC Sets (ECM)
- Conditions for Clearing the DTC (ECM)
- Diagnostic Aids (ECM)
- Reference Information (ECM)
- Circuit/System Testing (ECM)
- Repair Procedures (ECM)
- DTC P0562 (FSCM)
- Diagnostic Instructions (FSCM)
- DTC Descriptor (FSCM)
- Diagnostic Fault Information (FSCM)
- Circuit/System Description (FSCM)
- Conditions for Running the DTC (FSCM)
- Conditions for Setting the DTC (FSCM)
- Action Taken When the DTC Sets (FSCM)
- Conditions for Clearing the DTC (FSCM)
- Reference Information (FSCM)
- Circuit/System Testing (FSCM)
- Repair Procedures (FSCM)
- DTC P0563 (ECM)
- Diagnostic Instructions (ECM)
- DTC Descriptor (ECM)
- Diagnostic Fault Information (ECM)
- Circuit/System Description (ECM)
- Conditions for Running the DTC (ECM)
- Conditions for Setting the DTC (ECM)
- Action Taken When the DTC Sets (ECM)
- Conditions for Clearing the DTC (ECM)
- Diagnostic Aids (ECM)
- Reference Information (ECM)
- Circuit/System Verification (ECM)
- Repair Procedures (ECM)
- DTC P0563 (FSCM)
- Diagnostic Instructions (FSCM)
- DTC Descriptor (FSCM)
- Diagnostic Fault Information (FSCM)
- Circuit/System Description (FSCM)
- Conditions for Running the DTC (FSCM)
- Conditions for Setting the DTC (FSCM)
- Action Taken When the DTC Sets (FSCM)
- Conditions for Clearing the DTC (FSCM)
- Diagnostic Aids (FSCM)
- Reference Information (FSCM)
- Circuit/System Verification (FSCM)
- Repair Procedures (FSCM)
- DTC P0615
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Procedures
- DTC P0622
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- Symptoms - Engine Electrical
- Battery Inspection/Test
- Battery Charging
- Battery Electrical Drain/Parasitic Load Test
- Battery Common Causes of Malfunction
- Charging System Test
- Generator Noise Diagnosis
- Starter Solenoid Does Not Click (Manual MA5)
- Starter Solenoid Does Not Click (Automatic M30)
- Starter Solenoid Clicks, Engine Does Not Crank
- Engine Cranks Slowly
- Starter Noise Diagnosis
- Repair Instructions
- Battery Negative Cable Disconnection and Connection
- Battery Positive and Negative Cable Replacement (LLR)
- Battery Negative Cable Replacement (LH8)
- Generator Cable Replacement (With LLR)
- Battery Replacement (LLR)
- Battery Replacement (LH8)
- Battery Box Replacement (LH8,LLR)
- Starter Replacement (LLR)
- Starter Replacement (LH8)
- Generator Bracket Replacement (LLR)
- Generator Replacement (LLR)
- Generator Replacement (LH8)
- Description and Operation
- Special Tools and Equipment
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.