Code Definition

C1189 — Brake Fluid Level Sensor Input Short Circuit To Ground

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

About C1189

C1189 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 C1189 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

C1189 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 in the master cylinder reservoir that signals the ABS or body control module of the brake fluid level. DTC C1189 sets when the module detects the sensor input shorted to ground, meaning the signal line is pulled to ground continuously rather than switching with float position. The module supplies a reference voltage on the input and watches for it to drop when the float closes the switch, so a constant ground reading is interpreted as an out of range low input or a permanently closed switch. With the inp...

Join TaT to view the complete code information and diagnostic details.

Quick Facts