Code Definition

C1940 — Brake Pressure Switch Mechanical Failure

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

About C1940

C1940 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.

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.

C1940 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 brake pressure switch tells the ABS or stability control module when hydraulic pressure is present in the brake circuit, confirming the driver is braking. Unlike a wiring fault, DTC C1940 is a mechanical or rationality failure, set when the switch is electrically connected but its state does not change appropriately with actual brake pressure, for example the contacts stick, fail to close under pressure, or remain closed with the pedal released. The module detects that the switch signal does not correlate with related braking inputs such as the brake light switch or the hydraulic pressure ...

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