Code Definition

B2891 — Wiper Switch Circuit Failure

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Ford

About B2891

B2891 is a generic (obd-ii standard) 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 B2891 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.

Because B2891 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Body Control Module (BCM) monitors the wiper switch input circuits to determine the driver selected wiper mode (intermittent, low speed, high speed, mist, or off) and the variable delay setting on vehicles equipped with that feature. The BCM uses either discrete switched inputs or a resistive ladder network from the multifunction stalk switch to identify each commanded position. DTC B2891 is set when the BCM detects an electrical fault in the wiper switch circuit such as an open, a short to ground, a short to battery voltage, or an invalid or implausible signal that does not correspond to ...

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