Code Definition

C1186 — ABS Power Relay Output Open Circuit

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

About C1186

C1186 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 C1186 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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.

C1186 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 ABS power relay output circuit, the switched feed that supplies battery voltage from the relay to the ABS hydraulic control unit pump motor and valve solenoids. DTC C1186 sets specifically when the ABS control module commands the relay on but detects an open circuit on the output, meaning no voltage reaches the pump and valve supply. This differs from a general output failure in that the module has identified a loss of continuity rather than a short to ground or power, typically caused by a failed relay, a blown output fuse, or a broken feed wire. When this cod...

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