Code Definition

B139C (22) — Front Wiper Variable Intermittent Mode Input Signal – Signal Stuck

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

About B139C

B139C 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.

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.

B139C 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 Front Wiper Control Module or Body Control Module (BCM) on the affected Ford monitors the variable intermittent wipe input from the wiper and lighting stalk, which is normally a variable resistance or voltage signal that the module reads to determine the driver's selected intermittent delay setting. As the driver rotates the intermittent delay ring on the stalk, the signal voltage steps through a series of discrete levels (or sweeps through a resistance ladder) so the module can map each position to a specific wipe delay interval. DTC B139C:22 is set when the module detects that the variab...

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