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 1067 (ENGINE CONTROLS DIAGNOSIS - 6.6L (LB7) (DTCS P0237 TO P0611))
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 1067 (Engine Controls Diagnosis - 6.6L (Lb7) (DTCS P0237 To P0611))
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 1067 (Engine Controls Diagnosis - 6.6L (Lb7) (DTCS P0237 To P0611))
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Diagnosis
- DTC P0237 (California RPO YF5, NE1, and VCL)
- DTC P0237 (Federal RPO FE9, NG1)
- DTC P0238 (California RPO YF5, NE1, and VCL)
- DTC P0238 (Federal RPO FE9, NG1)
- DTC P0300 (Federal Emissions)
- DTC P0300 (California Emissions, and RPO VCL)
- DTC P0301-P0308 (Federal Emissions)
- DTC P0301-P0308 (California Emissions, and RPO VCL)
- DTC P0335
- DTC P0336
- DTC P0340
- DTC P0341
- DTC P0370 or P0374
- DTC P0380 (Federal RPO FE9, NG1)
- DTC P0380 (California RPO YF5, NE1)
- DTC P0401
- DTC P0404
- DTC P0405
- DTC P0406
- DTC P0489
- DTC P0490
- DTC P0540
- DTC P0543
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610
- DTC P0611
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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.