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.
2008 Hummer H3 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Section 53 (Data Communication System)
WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Data Communications
- DTC B1000
- DTC B1001
- DTC B1009
- DTC U0100 - U02FF
- DTC U1000 and U1255
- DTC U1001-U1254
- DTC U1300, U1301, or U1305
- Symptoms - Data Communications
- Scan Tool Does Not Power Up
- Scan Tool Does Not Communicate with Class 2 Device
- Scan Tool Does Not Communicate with High Speed GMLAN Device
- Data Link References
- Repair Instructions
- Description and Operation
Factory Service Tools
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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.