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 1799 (IMMOBILIZER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Diagnostic Code Index
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Code Index
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC B0688 | Security System Indicator Circuit High |
| DTC B0689 | Security System Indicator Circuit Open |
| DTC B2947 | Security System Sensor Power Circuit Low |
| DTC B2948 | Security System Sensor Power Circuit High |
| DTC B2957 | Security System Sensor Data Circuit Low |
| DTC B2958 | Security System Sensor Data Circuit High |
| DTC B2960 | Security System Sensor Data Incorrect But Valid |
| DTC B3031 | Security System Controller In Learn Mode |
| DTC B3033 | Security System Indicates Tamper |
| DTC P1626 | Theft Deterrent Fuel Enable Signal Lost |
| DTC P1630 | Theft Deterrent Learn Mode Active |
| DTC P1631 | Theft Deterrent Start Enable Signal Not Correct |
RENDER: 1.0x
NO RELATED
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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.