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 MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 15 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC B1009: CHECKSUM ERROR IN CONTROL MODULETESTING
2002 Chevrolet Avalanche 2500, RWD
DTC B1009: Checksum Error In Control Module: Testing
2002 Chevrolet Avalanche 2500, RWDSECTION Testing
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Perform diagnostic system check for suspect system control module. See DIAGNOSTIC SYSTEM CHECK table under SELF-DIAGNOSTIC SYSTEM. Repair as necessary and go to step 4. If diagnostic system check has been performed for suspect system control module, go to next step.
- Check if DTC B1009 was set as a current DTC. If DTC B1009 was set as a current DTC, go to next step. If DTC B1009 was not set as a current DTC go to DIAGNOSTIC AIDS before proceeding to next step.
- Replace, suspect control module. Program and configure new control module. Go to next step.
- Using scan tool, clear DTCs. Operate vehicle within CODE ENABLE CRITERIA conditions. Using scan tool, retrieve DTCs. If DTC B1009 resets, return to step 2. If DTC B1009 does not reset, system is okay.
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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.