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 18 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC B1009: EEPROM CHECKSUM ERRORTESTING
2003 Chevrolet TrailBlazer 4.2 S, 4WD
DTC B1009: EEPROM Checksum Error: Testing
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana Special, 2001 GMC Savana Camper Special, and 2001 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
- If theft deterrent system diagnostic system check has been performed, go to next step. If theft deterrent system diagnostic system check has not been performed, go to THEFT DETERRENT SYSTEM DIAGNOSTIC SYSTEM CHECK .
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. Turn ignition switch to RUN position. Using scan tool, clear DTCs. If scan tool indicates B1009 is current, go to next step. If scan tool does not indicate B1009 as current, go to INTERMITTENTS under TROUBLESHOOTING.
- Replace appropriate module. After repair, go to next step.
- Using scan tool, clear DTCs. Operate vehicle within conditions for running the DTC as specified in supporting text. If DTC resets, go to step 2 .
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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.