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 DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXLIGHTING DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Lighting DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Lighting DTCS
LIGHTING DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0951 | Dimming Circuit |
| DTC B1480 | Battery Rundown Protection Circuit Malf |
| DTC B2527 | Front Fog Lamp Circuit Low |
| DTC B2530 | Front Foglamps Control Circuit |
| DTC B2540 | Rear Foglamps Control Circuit |
| DTC B2550 | Backup Lamps Control Circuit |
| DTC B2575 | Headlamp Control Circuit |
| DTC B2580 | Headlamp High Beam Control Circuit |
| DTC B2585 | Parklamp Control Circuit Malfunction |
| DTC B2610 | Passenger Compartment Dimming 1 Circuit |
| DTC B2615 | Passenger Compartment Dimming 2 Circuit |
| DTC B2620 | Display Dimming Input Circuit |
| DTC B2625 | Display Dimming Pulse Width Modulation (PWM) Output Circuit |
| DTC B2645 | Ambient Light Sensor Circuit |
| DTC B3801 | Passenger Compartment Lamp Request Circuit |
| DTC B3802 | Parklamps Request Circuit |
RENDER: 1.0x
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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.