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.
Scan Tool Data Definitions
- 8 - Digit GM Part Number
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The scan tool displays the 8 - Digit GM Part Number. The scan tool displays the part number of the control module.
- Auto. Learn Counter
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The scan tool displays 0-3. The scan tool displays the current state of the Auto. Learn Timer Counter. The Auto. Learn Counter must increment a total of 3 times in order for the relearn procedure to be complete.
- Auto. Learn Timer Status
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The scan tool displays: 00 Sec. - 10:00 Min. The scan tool displays the current state of the Auto. Learn Timer which increments in 10 second intervals. The Auto. Learn Timer must time out 3 times in order for the relearn procedure to be complete.
- Battery Charger
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The scan tool displays On/Off. When the module senses the battery charger the scan tool displays On.
- Battery State
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The scan tool displays Normal/High/Low. The scan tool displays the current battery state input.
- Battery Voltage
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The scan tool displays 0-30 volts. The scan tool displays the current Battery Voltage input.
- Calibration ID
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The scan tool displays the Calibration ID. Display indicates the calibration ID of the VTD systems module.
- Dash Mode
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The scan tool displays On/Off. The scan tool displays On when the vehicle is equipped with a dash mounted ignition switch.
- Data Fail Enable Flag
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The scan tool displays On/Off. The scan tool displays On when the VTD system is in the fail enable state.
- Export Mode
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The scan tool displays On/Off. The scan tool displays On when the VTD system is configured as export. The scan tool displays Off when the VTD system is configured as domestic.
- Fail Enable Counter
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The scan tool displays 0-255. The scan tool displays the number of ignition cycles the theft deterrent control module has been in the fail enable state.
- First Key Flag
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The scan tool displays On/Off. The scan tool displays On when the theft deterrent control module is ready to learn the first key transponder value.
- Fuel Continue
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The scan tool displays On/Off. The scan tool displays On when the VTD system has read a valid key and is sending its fuel continue password via the serial data circuit.
- Fuel Disable Ignition Off
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The scan tool displays On/Off. The scan tool displays On when the PCM has received the fuel disable password from the VTD system. This indicates the PCM will not allow fuel delivery until the ignition is switched off prior to another start attempt.
- Fuel Disable Timeout
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The scan tool displays On/Off. The scan tool displays On when the VTD system disables sending the fuel continue password.
- Ignition Counter
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The scan tool displays 0-255. The module counts each time the ignition is cycled from ON to OFF.
- Ignition Cycle Enable
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The scan tool displays On/Off. The scan tool displays On when the theft deterrent control module is ready to monitor an incoming key transponder value.
- Ignition Voltage
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The scan tool displays 0-18. The scan tool displays the current ignition voltage.
- Incorrect Code Flag
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The scan tool displays On/Off. The scan tool displays On when it detects an unlearned key transponder value.
- Indicator Commanded
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The scan tool displays On/Off/Flash. The scan tool displays the current state of the security indicator as commanded by the VTD system.
- Invalid Key Counter
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The scan tool displays 0-255. The scan tool displays the number of unlearned key transponder values since it has read a valid key transponder value.
- Invalid Key Timeout
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The scan tool displays On/Off. The scan tool displays On when the VTD system disables reading the key transponder value.
- Julian Date of Build
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The scan tool displays the Julian Date of Build. Display indicates the date the module was built.
- Key Not Present Flag
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The scan tool displays On/Off. The scan tool displays On when the ignition is switched to the run position and the VTD system does not detect any key transponder value.
- Learn Additional Keys Flag
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The scan tool displays On/Off. The scan tool displays On when the VTD system is ready to learn additional key transponder values.
- Learn Coded Key
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The scan tool displays On/Off. The scan tool displays On when the VTD system is ready to learn the key transponder value on the next ignition cycle from on to off and back on.
- Manufactures Enable Counter
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The scan tool displays 0-255. The Manufactures Enable Counter is cleared prior to leaving the assembly plant. This data value is for use at the assembly plant only.
- Master Keys Learned
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The scan tool displays 0-10. The scan tool displays the number of learned master keys.
- No. of Key Codes Learned
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The scan tool displays 1-10. The scan tool displays the number of transponder values learned by the theft deterrent control module.
- Password Learning Enabled
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The scan tool displays On/Off. The scan tool displays On when the VTD system is in the password learn state.
- PROM ID
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The scan tool displays the PROM ID. The scan tool displays the 4- digit internal PROM ID of the module.
- Read Complete Flag
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The scan tool displays On/Off. The scan tool displays On when the VTD system has completed reading the key transponder.
- Read Key Code
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The scan tool displays On/Off. The scan tool displays On when the VTD system is attempting to read the key transponder.
- Read Key Timer
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The scan tool displays 0-1305. The scan to displays the time the VTD system has been attempting to read the key transponder.
- Report Password
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The scan tool displays On/Off. The scan tool displays On when the VTD system has sent its fuel continue password to the PCM via the serial data circuit.
- System Power Mode
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The scan tool displays Unknown/Off Battery Save/Off Asleep/Off Awake/Unlock/Rap Unlock/Accessory/Run/Crank/Rap. The scan tool displays the current state of the VTD system power mode.
- Start Disable
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The scan tool displays On/Off. The scan tool displays On when the VTD system has disabled sending the fuel continue password to the PCM. The PCM will not command the starter relay on.
- Tamper Flag
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The scan tool displays On/Off. The scan tool displays On when the VTD system has read a key transponder value that has not been previously learned.
- Two Good Keys Flag
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The scan tool displays On/Off. The scan tool displays On when the VTD system is ready to learn the 2 key transponder values.
- Theft Problem
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The scan tool displays On/Off. The scan tool displays On when the VTD system has read a problem.
- Valid Code Flag
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The scan tool displays On/Off. The scan tool displays On when the VTD system has read a valid key transponder.
- Valet Flag
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The scan tool displays On/Off. The scan tool displays On when the VTD system has read the key transponder being used is coded as a valet key.
- VIN Received
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The scan tool displays On/Off. The scan tool displays On when the VTD system has received the VIN information.
- VTD Fail Enable
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The scan tool displays On/Off. The scan tool displays On when the VTD system has been configured with VTD fail enable.
- VTD Power State
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The scan tool displays Asleep/Wakeup/Request/System/Default. The scan tool displays the current power state of the VTD system.
- VTD States
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The scan tool displays Ignition Off/Normal Decision/Learn First key/Tamper/Monitor Key/Fail Enable/Learn More Keys/Seedkey Lrn Pend/Seedkey Learn/Auto Learn Pend/Auto Learn/Wakeup/No Coded Key/Check Second Key/Auto Lrn Done/Vin Check/Vin Timer. The scan tool displays the current state of the VTD system.
- Year Module Built
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The scan tool displays the year the module was built.
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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.