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 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Powertrain Management: Technical Service Bulletins
- Recalls
- Customer Interest
- Drivetrain - 4WD Message Light On DTC C0327 Set
- Electrical - MIL/DTC P2138 with Reduced Engine Power
- Fuel System - Driveability Issues/MIL ON/Multiple DTC's
- A/T - Harsh 1-2 Shifts/DTC's P0741/P0756/P0894
- A/T - MIL ON/DTC P0757/Slipping/Poor Performance
- Fuel System - Poor Performance Due to Injector Clogging
- Engine - Over Oiled Aftermarket Air Filter Concerns
- A/T - No Movement in Drive or Third
- Electrical - Warning Lamps/Electrical Malfunctions
- By Symptom
- Abnormal wear/deterioration
- Customer Interest
- Drivetrain - 4WD Message Light On DTC C0327 Set
- Electrical - MIL/DTC P2138 with Reduced Engine Power
- Fuel System - Driveability Issues/MIL ON/Multiple DTC's
- A/T - Harsh 1-2 Shifts/DTC's P0741/P0756/P0894
- A/T - MIL ON/DTC P0757/Slipping/Poor Performance
- Fuel System - Poor Performance Due to Injector Clogging
- Engine - Over Oiled Aftermarket Air Filter Concerns
- A/T - No Movement in Drive or Third
- Electrical - Warning Lamps/Electrical Malfunctions
- Driveability
- Erratic Shifting
- False instrument warning light/gauges
- Hard Shifting
- Inoperative
- Recalls
- Slipping
- All Technical Service Bulletins
- Recall - Directional Indicator Rework
- Drivetrain - 4WD Message Light On DTC C0327 Set
- Aftermarket Parts - Non GM Parts And Accessories Info
- Engine, A/T Controls - Non-GM Calibration ID
- Electrical - MIL/DTC P2138 with Reduced Engine Power
- A/T Controls - Procedure To Take Snapshot Data
- Fuel System - Driveability Issues/MIL ON/Multiple DTC's
- A/T Controls - DTC P0756 Diagnostics
- A/T - DTC P0894 and P1870 Diagnostic Information
- A/T - Harsh 1-2 Shifts/DTC's P0741/P0756/P0894
- A/T - MIL ON/DTC P0757/Slipping/Poor Performance
- Engine Controls - Normal MIL Operation Information
- Engine Controls - Reprogramming Warranty Coverage
- Fuel System - Poor Performance Due to Injector Clogging
- Engine - Over Oiled Aftermarket Air Filter Concerns
- Instruments - PRNDL Display Dim for One Minute
- Fuel System - E85 Fuel Usage Precaution
- Fuel System - GM Fuel Systems Treatment Plus(R)
- Fuel System - E85 Fuel Usage Information
- Engine/Fuel System - Additive Information
- A/T - No Movement in Drive or Third
- Fuel System - TOP TIER Detergent Gasoline Information
- Fuel System - TOP TIER Detergent Gasoline
- Exhaust System - Sulfur Odor Explanation
- Electrical - Warning Lamps/Electrical Malfunctions
- Engine - Unnecessary Flushing Services/Recommendations
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.