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.
2005 Hummer H2 4D Utility PickupFACTORY OEM SERVICE PROCEDURE
Inspection/Maintenance (I/M) System DTC Table
Inspection/Maintenance (I/M) System DTC Table
| System | DTCs Required to Set System Status to YES |
|---|---|
| Catalyst | DTC P0420 or P0430 |
| EVAP | DTC P0451 DTC P0454 DTC P0455 DTC P0442 DTC P0446 DTC P0461 in Instrument Panel, Gages, and Console DTC P0464 in Instrument Panel, Gages, and Console DTC P0496 |
| Oxygen Sensor | DTC P0133 or P0153 DTC P0140 or P0160 DTC P1133 or P1153 DTC P1134 or P1154 DTC P2A01 or P2A04 |
| Oxygen Sensor Heater | DTC P0053, P0054, P0059, or P0060 DTC P0135 or P0155 DTC P0141 or P0161 |
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.
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