Code Definition

C1100 — ABS Pump Switch Circuit Failure

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

About C1100

C1100 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 C1100 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.

C1100 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 C1100 is a chassis code set by the ABS module when it detects a failure in the pump switch circuit. On systems that use a hydraulic accumulator, the pump switch, which is a pressure switch, signals the module when accumulator pressure rises or falls past set thresholds, allowing the module to control the pump motor and maintain stored brake pressure. C1100 sets when the switch signal is implausible, stuck, open, or shorted, so the module can no longer rely on it to manage pump operation. When set the ABS warning lamp illuminates, the pump may run continuously or not at all, and anti lock f...

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