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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1041 (TRAILER BRAKE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Scan Tool Data List
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Scan Tool Data List
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
TBCM Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition is ON, engine OFF, and vehicle is stationary | |||
| ABS Active | TBCM | Yes/No | No |
| Brake Apply Pressure Status | TBCM | Invalid/Valid | Valid |
| Battery Voltage Signal | TBCM | Volts | B+ |
| Brake Switch Status | TBCM | On/Off | Off |
| Electric Trailer Brakes Detected | TBCM | Yes/No | No |
| TBCM Diagnostic Fault | TBCM | Yes/No | No |
| Ignition Run/Crank | TBCM | Active/Inactive | Inactive |
| Low Speed Brake Hold | TBCM | Active/Inactive | Inactive |
| Master Cylinder Pressure Sensor Input | TBCM | kPa/psi | Varies |
| Manual Apply Switch | TBCM | % | Varies |
| Manual Apply Switch Position Error | TBCM | % | Varies |
| Redundant Manual Apply SW. | TBCM | % | Varies |
| Trailer Brake Control | TBCM | Disabled/Enabled | Enabled |
| TBCM Relay Feedback Signal | TBCM | Volts | 12 Volts |
| Trailer Stop Lamp Signal | TBCM | Not Requested/Requested | Not Requested |
| Trailer Brake Relay Cmd. | TBCM | Volts | 12 Volts |
| TBCM Duty Cycle | TBCM | % | Varies |
| Trailer Brake Relay Cmd. | TBCM | Volts | 12 Volts |
| Trailer Brake Relay Status | TBCM | Disabled/Enabled | Enabled |
| Trailer Connection Detected | TBCM | Yes/No | No |
| Trailer Disconnect Detected | TBCM | Yes/No | No |
| User Gain Switch | TBCM | % | Varies |
| Vehicle Speed | TBCM | km/h or mph | km/h or mph |
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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.