Code Definition

B140C (13-08) — Rear Right Turn Indicator Circuit Open

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

About B140C

B140C 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 B140C is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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.

B140C 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) monitors the rear right turn indicator circuit for correct current draw and voltage feedback during activation. DTC B140C is set when the BCM commands the rear right indicator on but detects no current flow, indicating an open circuit condition between the BCM driver output and the lamp ground. The BCM uses a low side or high side smart driver that measures load current to detect bulb out and open circuit faults, and on vehicles fitted with LED rear lamps the BCM expects a specific current signature from the LED module rather than a tungsten filament. When the cod...

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