Code Definition

B1C55 (14) — Horn Relay Coil Circuit

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B1C55

B1C55 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1C55 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1C55 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 Body Control Module (BCM) supervises the horn relay coil control circuit. When a horn request is made (via the steering wheel switch or alarm activation), the BCM supplies current to the horn relay coil and monitors the circuit feedback for voltage. DTC B1C55:14 is set when the module detects a short to ground condition on the relay coil control wire, meaning the measured voltage is lower than expected when the circuit should be inactive. The :14 failure type byte under the UDS standard specifies a short to ground, distinguishing this fault from open circuit or short to voltage variants. W...

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