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 PROCEDURESDIAGNOSTIC CODE INDEX
2006 Chevrolet Suburban C2500, 6.0 U
Diagnostic Code Index
2006 Chevrolet Suburban C2500, 6.0 USECTION Diagnostic Code Index
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.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC B3894 | Stop Lamp Switch Circuit Plausibility Failure |
| DTC C0561 | System Disabled Information Stored Invalid Serial Data Received |
| DTC C056D or C056E | ECU Hardware Performance |
| DTC C0800 | Device Power Circuit Voltage |
| DTC C0845 | Device Ignition 1 Circuit Voltage Below Threshold |
| DTC C0870 | Device Voltage Reference Output 1 Circuit |
| DTC C0880 | Device Voltage Reference Output 2 Circuit |
| DTC C0890 | Device Voltage Reference Output 3 Circuit |
| DTC C1112 | Trailer Brake Control Relay Low Control Circuit - Relay Control Active Low |
| DTC C1113 | Trailer Brake Control Relay High Control Circuit Short to Battery |
| DTC C1114 | Trailer Brake Control Solenoids Control Circuit-Trailer Auxiliary Supply Voltage |
| DTC C1115 | Manual Trailer Brake Apply Request Switch Signal |
| DTC C1116 | Manual Trailer Brake Apply Request Signal 1 |
| DTC C1117 | Manual Trailer Brake Apply Request circuit Signal 2-Redundant Manual Apply Signal |
| DTC C1118 | Trailer Brake Control Sensitivity Switch Circuit |
| DTC C1119 | Trailer Brake Control Relay Feedback Circuit |
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.