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.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1441 (ENGINE CONTROL SYSTEM - 4.2L - TROUBLESHOOTING & DIAGNOSIS)DIAGNOSIS INFORMATION & PROCEDURESINSPECTION/MAINTENANCE (I/M) SYSTEM DTC TABLE
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Inspection/Maintenance (I/M) System DTC Table
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Inspection/Maintenance (I/M) System DTC Table
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Inspection/Maintenance (I/M) System DTC Table
| System | DTCs Required to Set System Status to YES |
|---|---|
| AIR | DTC P0410 |
| Catalyst | DTC P0420 |
| Evaporative Emission (EVAP) | DTC P0442 DTC P0446 DTC P0496 |
| Oxygen Sensor | DTC P0130 DTC P0131 DTC P0132 DTC P0133 DTC P0134 DTC P0137 DTC P0138 DTC P0140 DTC P1133 DTC P1137 DTC P1138 |
| Oxygen Sensor Heater | DTC P0135 or P0141 |
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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.