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 1746 (LIGHTING 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 B1482 | Battery Rundown Protection Circuit Low |
| DTC B2532 | Front Fog Lamps Control Circuit Low |
| DTC B2533 | Front Fog Lamps Control Circuit High |
| DTC B2575 | Headlamp Control Circuit |
| DTC B2577 | Headlamp Relay Output Circuit Low |
| DTC B2578 | Headlamp Relay Output Circuit High |
| DTC B2585 | Park Lamp Circuit |
| DTC B2587 | Park Lamp Relay Output Circuit Low |
| DTC B2588 | Park Lamp Relay Output Circuit High |
| DTC B2600 | Daytime Running Lamp Control Circuit |
| DTC B2602 | Daytime Running Lamp Circuit Low |
| DTC B2603 | Daytime Running Lamp Circuit High |
| DTC B2622 | Display Dimming Pulse Width Modulation (PWM) Input Circuit Low |
| DTC B2623 | Display Dimming Pulse Width Modulation (PWM) Input Circuit High |
| DTC B2627 | Display Dimming Pulse Width Modulation (PWM) Output Circuit Low |
| DTC B2628 | Display Dimming Pulse Width Modulation (PWM) Output Circuit High |
| DTC B2647 | Ambient Light Sensor Circuit Low |
| DTC B2662 | Park Lamp Relay Output Circuit Low |
| DTC B2743 | Fog Lamp Switch Circuit High |
| DTC P0504 | Brake Switch Circuit 1-2 Correlation |
| DTC P1574 (ECMw/L61) | Stop Lamp Switch Circuit |
| DTC P1574 (PCMw/L66) | Stop Lamp Switch Circuit |
| DTC P1574 (TCMw/L61w/MN5) | Stop Lamp Switch Circuit |
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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.