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.
2003 Hummer H2FACTORY OEM SERVICE PROCEDURE
Engine Mechanical: Starter: Starters
- Description & Operation
- Starter Motor Usage
- Battery Usage
- Component Locator
- Engine Electrical Connector End Views
- Diagnostic Starting Point - Engine Electrical
- Diagnostic System Check - Engine Electrical
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code List
- Diagnostic Tests
- DTC B1327: Low Voltage
- DTC B1328: High Voltage
- DTC P0562: PCM Detects An Improper Voltage Below 11 Volts
- DTC P0563: PCM Senses System Voltage Is Above 19 Volts
- DTC P0615: Starter Relay Control Circuit Voltage
- DTC P1637: Improper Voltage On Generator L-Terminal Circuit
- DTC P1638: PWM Signal Is Out Of Range
- Symptoms - Engine Electrical
- Symptom List
- Notes
- Starter Solenoid Does Not Click
- Starter Solenoid Clicks, Engine Does Not Crank
- Engine Cranks Slowly
- Battery Inspection/Test (Non-Hp2)
- Battery Charging (Non-Hp2)
- Battery Electrical Drain/Parasitic Load Test (W/ BCM)
- Battery Common Causes Of Failure
- Charging System Test (Cs/Ad/Si Generators)
- Jump Starting In Case Of Emergency (Non Hp2)
- Charge Indicator Always On
- Charge Indicator Inoperative
- Generator Noise Diagnosis
- Removal & Installation
- Torque Specifications
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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