Code Definition

C1187 — Brake Fluid Level Sensor Input Open Circuit

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

About C1187

C1187 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 C1187 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

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.

C1187 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

This chassis code relates to the brake fluid level sensor circuit, a float operated switch mounted in the master cylinder reservoir that signals the ABS or body control module when the fluid drops below the minimum level. DTC C1187 sets when the module detects an open circuit on the sensor input, meaning the signal or ground path to the switch is broken and the module can no longer read fluid level. Because the module cannot confirm adequate fluid, it will typically illuminate the brake warning lamp and on some vehicles limit or disable ABS and stability functions. The open is most often in th...

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