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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (IMMOBILIZER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
2009 Chevrolet Tahoe Base, 4.8 C
Scan Tool Data List
2009 Chevrolet Tahoe Base, 4.8 CSECTION Scan Tool Data List
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, Engine OFF | |||
| Theft LED | Theft Data | On/Off | Off |
Engine Control Module (ECM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, Engine OFF | |||
| ECM Authentication Status | Engine Electrical | Unknown/Incorrect/Negative/Valid | Valid |
| ECM Challenge Status | Engine Electrical | Valid/Invalid | Valid |
| ECM Response Source | Engine Electrical | Normal/Remote Start | Normal |
| VTD Auto Learn Counter | Engine Electrical | Counts | Varies |
| VTD Auto Learn Timer | Engine Electrical | Active/Inactive | Inactive |
| VTD Password Learn Enabled | Engine Electrical | Yes/No | No |
| VTD Security Code Accepted | Engine Electrical | Yes/No | Yes |
| VTD Security Code Lockout | Engine Electrical | Active/Inactive | Inactive |
| VTD Security Code Programmed | Engine Electrical | Yes/No | Yes |
| VTD Security Info Programmed | Engine Electrical | Yes/No | Yes |
| VTD System Status | Engine Electrical | Standby/Fuel Disable/Dis. No Resp./Dis. Neg. Resp./Dis. Incor. Resp./Post Release/Pre-Release/Released | Released |
Theft Deterrent Module (TDM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, Engine OFF | |||
| Auto Learn Counter | TDM Data | Counts | Varies |
| Auto Learn Timer | TDM Data | Minutes | Varies |
| Battery Reconnect | TDM Data | Yes/No | No |
| Ignition Voltage Signal | TDM Data | Present/Not Present | Present |
| Immobilization | TDM Data | Active/Inactive | Inactive |
| Immobilizer Programmed | Powertrain Status | Yes/No | Yes |
| Master Keys Learned | Learn Key Data | Counts | Varies |
| PCM Auto Learn Timer | Powertrain Status | Active/Inactive | Inactive |
| PCM Password Learning | Powertrain Status | Disabled/Enabled | Disabled |
| Power Mode | TDM Data | Off/Accessory/Run/Crank Request | Run |
| Powertrain DTC | Powertrain Status | Yes/No | No |
| Previous TDM State | TDM Data | Asleep/Wakeup/Normal/Learn Passkey/Tamper/Monitor Key/Fail Pending/Lrn Keys Stdby/Learn More Keys/Learn Pending/Auto Learn/Auto Lrn Done/No Coded Key | Varies |
| Security Code Programmed | Powertrain Status | Yes/No | Yes |
| Start Disabled | TDM Data | Yes/No | No |
| Telltale Status | TDM Data | Off/On/Flash/Invalid | Off |
| Tamper Status | TDM Data | Active/Inactive | Inactive |
| TDM State | TDM Data | Asleep/Wakeup/Normal/Learn Passkey/Tamper/Monitor Key/Fail Pending/Lrn Keys Stdby/Learn More Keys/Learn Pending/Auto Learn/Auto Lrn Done/No Coded Key | Normal |
| Theft Problem | TDM Data | Yes/No | No |
| Total Keys Learned | Learn Key Data | Counts | Varies |
| Transponder Key | Learn Key Data | Present/Not Present | Present |
| Valid Key | Learn Key Data | Yes/No | Yes |
| VIN Message Received | TDM Data | Yes/No | Yes |
RENDER: 1.0x
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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.