Code Definition

C1103 — ABS Hydraulic Brake Switch Circuit Failure

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Generic

About C1103

C1103 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1103 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1103 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

DTC C1103 is a chassis code set by the ABS module when it detects a failure in the hydraulic brake switch circuit. The hydraulic brake switch is a pressure operated switch in the brake hydraulic system that tells the ABS module when the brakes are being applied, used to confirm brake application alongside or instead of the conventional brake pedal switch. C1103 sets when the switch signal is open, shorted, stuck, or does not agree with other brake application inputs, so the module can no longer reliably determine braking state. When set the ABS warning lamp illuminates and anti lock and stabil...

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