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 Impala LSFACTORY OEM SERVICE PROCEDURE
Body Control Module DTCS
BODY CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B1000 | Internal Write/Checksum Malfunction |
| DTC B1007 | EEPROM Error |
| DTC B1009 | EEPROM Error |
| DTC B1339 | B+ Supply Circuit |
| DTC B1349 | Ground Circuit Greater Than 4 Volts |
| DTC B1440 | Ignition Switch Circuits May Be Shorted To Either B+ Or Ground |
| DTC B1507 or B1508 | Load Control Circuit |
| 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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