Code Definition

C1954 — Master Cylinder Pressure Sensor Circuit Failure

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

About C1954

C1954 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 C1954 is stored, the module has detected 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.

C1954 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

The master cylinder pressure sensor measures the brake hydraulic pressure the driver applies and reports it to the ABS or stability control module for brake assist and stability intervention. Unlike a specific open circuit code, DTC C1954 is a general pressure sensor circuit failure, set when the module detects an electrical fault such as a short, an implausible or out of range signal, a value that does not correlate with brake pedal application, or an internal sensor fault. When this code is set the brake assist and stability functions are usually disabled and the warning lamps illuminate, be...

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