Code Definition

B1839 — Wiper Rear Motor Circuit Failure

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

About B1839

B1839 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 B1839 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.

B1839 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 B1839 fault code is set by the Generic Electronic Module (GEM) or Body Control Module (BCM) when it detects an electrical failure in the rear wiper motor control circuit. The rear wiper motor is typically operated through a dedicated relay or H bridge driver inside the module, allowing the motor to be commanded in both directions for park and sweep operation. The module monitors the motor circuit for open, short to ground, short to power, or overcurrent conditions, and sets this code when the actual circuit state does not match the commanded state. Common symptoms include a rear wiper that...

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