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.
2007 Hummer H3 AutomaticFACTORY OEM SERVICE PROCEDURE
Battery, Charging System And Starting System
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Engine Electrical
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- DTC B1327
- DTC B1390
- DTC B1487
- DTC B1488
- DTC B1492
- DTC B1516
- DTC B1566
- DTC C0899
- DTC C0901
- DTC P0562
- DTC P0563
- Symptoms - Engine Electrical
- Battery Inspection/Test (Non-HP2)
- Battery Charging
- Battery Electrical Drain/Parasitic Load Test
- Battery Common Causes of Malfunction
- Jump Starting in Case of Emergency (Non HP2)
- Charging System Test
- Charge Indicator Always On
- Charge Indicator Inoperative
- Generator Noise Diagnosis
- Starter Solenoid Does Not Click
- Starter Solenoid Clicks, Engine Does Not Crank
- Engine Cranks Slowly
- Starter Motor Noise Diagnosis
- Repair Instructions
- Description and Operation
- Battery Description and Operation
- Charging System Description and Operation
- Electrical Power Management (EPM) Overview
- Charging System Components
- Generator
- Generator Battery Control Module
- Powertrain Control Module (PCM)
- Instrument Panel Cluster (IPC)
- Charging System Operation
- Charge Mode
- Fuel Economy Mode
- Voltage Reduction Mode
- Start Up Mode
- Headlamp Mode
- Battery Sulfation Mode
- Windshield Wiper Voltage Boost Mode
- Fuel Pump Voltage Boost Mode
- De-Ice Voltage Boost Mode
- Instrument Panel Cluster (IPC) Operation
- Electrical Power Management Description and Operation
- Starting System 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.
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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.