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 MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1040 (TRAILER BRAKE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
2006 Chevrolet Suburban C2500, 6.0 U
Scan Tool Data List
2006 Chevrolet Suburban C2500, 6.0 USECTION 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.