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.
2003 Chevrolet TrailBlazer 4.2 S, 4WDFACTORY OEM SERVICE PROCEDURE
Body Control Module DTCS
BODY CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B1000 | Internal Malfunction |
| DTC B1001 | ID Mismatch |
| DTC B1004 | KAM In The Module Has Been Reset |
| DTC B1007 | EEPROM Error |
| DTC B1009 | EEPROM Error |
| DTC B1440 | Monitored Ignition Switch Circuits Has Malfunctioned |
| DTC C0550 | Internal Write/Checksum Malfunction |
Factory Service Tools
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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.
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