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 MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRPASSWORD LEARN PROCEDUREUSING A T50/T60/T20+
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Using A T50/T60/T20+
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Using A T50/T60/T20+
IMPORTANT: Refer to DTC P1631 Theft Deterrent Password Incorrect if the Passlock Learn Procedure cannot be completed successfully. Testing and Inspection
IMPORTANT: Performing the following procedures will cause a DTC P1630 to set when they are completed. This is the intended functionality. Once P1630 is set, turn the ignition OFF for 30 seconds, then turn the ignition ON and P1630 will clear. If P1630 does not clear, go to DTC P163O Theft Deterrent VCM in Learn Mode. Testing and Inspection
PROCEDURE
1. Using the T50/T60/T20+, enter the Service Programming System (SPS).
2. Select Terminal to Vehicle Programming.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Select Vehicle Theft Re-learn.
5. Follow the instructions on the remaining screens.
^ The VCM and the Passlock control module will prepare for a re-learn.
^ A security timer will be ON for approximately 10 minutes or until DTC P1630 sets.
^ When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
IMPORTANT: Performing the following procedures will cause a DTC P1630 to set when they are completed. This is the intended functionality. Once P1630 is set, turn the ignition OFF for 30 seconds, then turn the ignition ON and P1630 will clear. If P1630 does not clear, go to DTC P163O Theft Deterrent VCM in Learn Mode. Testing and Inspection
PROCEDURE
1. Using the T50/T60/T20+, enter the Service Programming System (SPS).
2. Select Terminal to Vehicle Programming.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Select Vehicle Theft Re-learn.
5. Follow the instructions on the remaining screens.
^ The VCM and the Passlock control module will prepare for a re-learn.
^ A security timer will be ON for approximately 10 minutes or until DTC P1630 sets.
^ When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
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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.