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 1605 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC TROUBLE CODE (DTC) LIST
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Diagnostic Trouble Code (DTC) List
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Trouble Code (DTC) List
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Trouble Code (DTC) List
| DTC | Diagnostic Procedure | Module(s) |
|---|---|---|
| CXXX | DIAGNOSTIC TROUBLE CODE (DTC) LIST in Antilock Brake System | Electronic Brake Control Module (EBCM) |
| P0502 | DTC P0502: VSS CIRCUIT -- LOW INPUT | Powertrain Control Module (PCM) |
| P0503 | DTC P0503: VSS CIRCUIT -- INTERMITTENT | Powertrain Control Module (PCM) |
| P0562 | DTC P0562 | Powertrain Control Module (PCM) |
| P0563 | DTC P0563 | Powertrain Control Module (PCM) |
| P0567 | DTC P0567 | Powertrain Control Module (PCM) |
| P0568 | DTC P0568 | Powertrain Control Module (PCM) |
| PXXX | DIAGNOSTIC TESTS . | Powertrain Control Module (PCM) |
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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.