Code Definition

C1188 — Brake Fluid Level Sensor Input Short Circuit To Battery

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

About C1188

C1188 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 C1188 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.

C1188 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 informs the ABS or body control module of the brake fluid level. DTC C1188 sets when the module detects the sensor input shorted to battery voltage, meaning it reads a high voltage on the signal line that should swing between a low reference and ground depending on float position. This is typically caused by the signal wire chafing against a powered conductor or by moisture bridging the circuit to a battery feed. With the input shorted high the module cannot interpre...

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