Code Definition

C111B (15) — Left Stop Lamp Circuit Short to Battery

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

About C111B

C111B is a manufacturer-specific chassis diagnostic trouble code recorded for Ford vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C111B is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

C111B 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 Antilock Brake System (ABS) module monitors the stop lamp output circuits to confirm correct brake pedal application and lamp operation. DTC C111B is set when the ABS module detects battery voltage on the left stop lamp circuit when it is not commanded on, indicating a short to battery voltage. This condition prevents accurate stop lamp control and brake pedal status detection, and it may affect ABS, traction control, or stability control operation as well as cause incorrect brake light behaviour such as a lamp that stays on.

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