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 MANUALSCHEVROLET2000C TAHOE 2WD V8-4.8L VIN VREPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONSSECURITY DATA
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN V
Security Data
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN VSECTION Security Data
Auto Learn Timer: The scan tool displays the seconds used by the BCM to learn valid code from the Passlock(TM) sensor. The learn procedure consists of 3 consecutive periods.
Battery Voltage: The scan tool displays the battery system voltage.
Content Theft Lamp: The scan tool displays the state of the SECURITY lamp. The scan tool displays ON when activated by an unauthorized entry.
Content Theft State: The scan tool displays the state of the content theft feature. The scan tool displays ALARM when activated by an unauthorized entry.
Door Key Switch: The scan tool displays the state of the door key switch. The scan tool displays ACTIVE when the switch is activated in either door key cylinder.
Ignition 1: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN or CRANK position.
Ignition 3: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN position.
Passlock(TM) Code: The scan tool displays the validity of the Passlock(TM) code-received by the BCM. The scan tool displays OPEN, SHORTED, TAMPER and a valid code as a numeric value (1-10).
Passlock(TM) Data Voltage: The scan tool displays the voltage code from the Passlock(TM) sensor to the BCM. The BCM determines if the voltage received is a valid or invalid code voltage.
Passlock(TM) State: The scan tool displays the state of the Passlock(TM) system.
Security Lamp State: The scan tool displays the state of the SECURITY lamp. The scan tool displays ON, OFF or FLASHING.
Tamper Timer: The scan tool displays the time remaining when in the tamper mode. The timer starts when the ignition switch is turned to the RUN position and the BCM receives a Passlock(TM) data voltage different from the last learned voltage. The timer has a delay of 10 minutes and will stay active even if the ignition switch is cycled from the RUN to the OFF position.
VCM/PCM Fail Enable: The scan tool displays the state of the VCM/PCM fail enable mode. The scan tool displays YES when the Passlock(TM) system transitions from the Monitor Passlock(TM) Data state to the VCM/PCM Fail Enable state.
VCM/PCM Fuel Continue: The scan tool displays the state of the VCM/PCM fuel continue mode. The scan tool displays YES when the Passlock(TM) system verifies a valid password to the BCM.
VCM/PCM Learn Timer: The scan tool displays the state of the VCM/PCM learn timer. The scan tool displays INACTIVE when the BCM is not in a learn mode.
VTD Fuel Disable: The scan tool displays the state of the VTD fuel disable mode. The scan tool displays INACTIVE when the Passlock(TM) system verifies a valid password.
VTD Fuel Disable Until Ignition Off: The scan tool displays the state of the VTD fuel disable until Ignition off mode. The scan tool displays NO when the Passlock(TM) system verifies a valid password.
VTD Password Learn Mode: The scan tool displays the state of the VTD password learn mode. The scan tool displays INACTIVE when the Passlock(TM) system is not in a learn mode.
Battery Voltage: The scan tool displays the battery system voltage.
Content Theft Lamp: The scan tool displays the state of the SECURITY lamp. The scan tool displays ON when activated by an unauthorized entry.
Content Theft State: The scan tool displays the state of the content theft feature. The scan tool displays ALARM when activated by an unauthorized entry.
Door Key Switch: The scan tool displays the state of the door key switch. The scan tool displays ACTIVE when the switch is activated in either door key cylinder.
Ignition 1: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN or CRANK position.
Ignition 3: The scan tool displays the state of the ignition switch. The scan tool displays ACTIVE when the ignition switch is in the RUN position.
Passlock(TM) Code: The scan tool displays the validity of the Passlock(TM) code-received by the BCM. The scan tool displays OPEN, SHORTED, TAMPER and a valid code as a numeric value (1-10).
Passlock(TM) Data Voltage: The scan tool displays the voltage code from the Passlock(TM) sensor to the BCM. The BCM determines if the voltage received is a valid or invalid code voltage.
Passlock(TM) State: The scan tool displays the state of the Passlock(TM) system.
Security Lamp State: The scan tool displays the state of the SECURITY lamp. The scan tool displays ON, OFF or FLASHING.
Tamper Timer: The scan tool displays the time remaining when in the tamper mode. The timer starts when the ignition switch is turned to the RUN position and the BCM receives a Passlock(TM) data voltage different from the last learned voltage. The timer has a delay of 10 minutes and will stay active even if the ignition switch is cycled from the RUN to the OFF position.
VCM/PCM Fail Enable: The scan tool displays the state of the VCM/PCM fail enable mode. The scan tool displays YES when the Passlock(TM) system transitions from the Monitor Passlock(TM) Data state to the VCM/PCM Fail Enable state.
VCM/PCM Fuel Continue: The scan tool displays the state of the VCM/PCM fuel continue mode. The scan tool displays YES when the Passlock(TM) system verifies a valid password to the BCM.
VCM/PCM Learn Timer: The scan tool displays the state of the VCM/PCM learn timer. The scan tool displays INACTIVE when the BCM is not in a learn mode.
VTD Fuel Disable: The scan tool displays the state of the VTD fuel disable mode. The scan tool displays INACTIVE when the Passlock(TM) system verifies a valid password.
VTD Fuel Disable Until Ignition Off: The scan tool displays the state of the VTD fuel disable until Ignition off mode. The scan tool displays NO when the Passlock(TM) system verifies a valid password.
VTD Password Learn Mode: The scan tool displays the state of the VTD password learn mode. The scan tool displays INACTIVE when the Passlock(TM) system is not in a learn mode.
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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.