Code Definition

B2107 — Front Wiper Motor Relay Circuit Short to Vbatt

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

About B2107

B2107 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2107 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

Because B2107 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) drives the front wiper motor relay coil to control wiper operation in low and high speed modes. DTC B2107 is set when the BCM detects that the wiper motor relay control circuit is shorted to battery voltage, meaning the control wire reads B+ voltage when the BCM is attempting to pull it to ground to energise the relay. This prevents the relay from being controlled properly by the BCM. When this code is set the wipers may run continuously, fail to operate, or operate erratically depending on whether the short is constant or intermittent. The driver typically notice...

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