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 1842 (DTC INDEX)LIGHTING DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Lighting DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Lighting DTCS
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
LIGHTING DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0951 | Headlamp On Indicator Control Circuit |
| DTC B1480 | Inadvertent Power Supply Voltage Circuit |
| DTC B2527 | Front Fog Lamp Switch Signal Circuit Is Shorted To Ground |
| DTC B2530 | Front Fog Lamp Relay Control Circuit |
| DTC B2540 | Rear Fog Lamp Relay Control Circuit |
| DTC B2550 | Backup Lamp Supply Voltage Circuit |
| DTC B2575 | Headlamp Low Beam Relay Control Circuit |
| DTC B2580 | High Beam Headlamp Relay Control Circuit |
| DTC B2585 | Park Lamp Relay Control Circuit |
| DTC B2600 | DRL Relay Control Circuit |
| DTC B2610 | Dimming Control Circuit |
| DTC B2615 | Courtesy Lamp Supply Voltage |
| DTC B2620 | Dimming Input Voltage |
| DTC B2625 | LED Dimming Signal Circuit Is Shorted To Ground |
| DTC B2645 | Ambient Light Sensor Signal Voltage |
| DTC B3801 | Courtesy/Dome Lamps |
| DTC B3802 | BCM Receives Headlamps ON Signal Request Without A Park Lamp ON Signal Request |
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.