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 MANUALSCHEVROLET1999CHEVY EXPRESS G1500, VAN CARGO, 5.7 RREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSANTI-THEFT SYSTEMDIAGNOSTIC TESTSDTC C0559: EEPROM CHECKSUM ERROR (DOMESTIC)TESTING PROCEDURE
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 R
Testing Procedure
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 RSECTION Testing Procedure
- If the VTD Diagnostic System Check was performed, go to the next step. If not, go to DIAGNOSTIC SYSTEM OPERATION CHECK - ANTI-THEFT (DOMESTIC) under TROUBLE SHOOTING.
- Turn the ignition switch to the OFF position. Replace the Passlock™ module. See ANTI-THEFT MODULE under REMOVAL & INSTALLATION. If the repair is complete, go to the next step.
- Reconnect all previously disconnected connectors and components. Turn the ignition switch ON. Connect the scan tool. Clear the DTCs. Perform one of the following Passlock™ reprogramming procedures:
- PASSLOCK™ Reprogramming Seed and Key. See PASSLOCK™ SEED & KEY under PROGRAMMING.
- PASSLOCK™ Reprogramming Auto Learn. See PASSLOCK™ AUTO LEARN under PROGRAMMING.
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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.