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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSTHEFT DETERRENT SYSTEMDIAGNOSTIC TESTSDTC C0559: EEPROM CHECKSUM ERRORTESTING
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
DTC C0559: EEPROM Checksum Error: Testing
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Testing
- If theft deterrent diagnostic system check has been performed, go to next step. If theft deterrent diagnostic system check has not been performed, go to THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK .
- Turn ignition switch to OFF position. Replace Passlock(tm) module. After repair, go to next step.
- Reconnect all previously disconnected connectors and components. Turn ignition switch to RUN position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . Clear DTCs. Perform PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS . After repair, perform PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS .
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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.