Code Definition

C1127 — Cruise Control Deactivator Brake Switch Circuit Failure

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

About C1127

C1127 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 C1127 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

C1127 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 cruise control deactivator brake switch, sometimes called the cruise release or redundant brake switch, signals the control module to disengage cruise control the moment the brake pedal is applied. It is usually a separate switch from the main stop lamp switch and provides a redundant safety input so cruise cannot remain engaged during braking. C1127 sets when the module detects a fault in this switch circuit, such as a signal that disagrees with the stop lamp switch, an open, or a short. When this code is set cruise control may not engage at all, since the module will not allow cruise ope...

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