Code Definition

B1406 — Driver Power Window Down Circuit Short To Ground

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

About B1406

B1406 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1406 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.

B1406 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) or Door Control Module (DCM) controls power window operation through driver and passenger window switches, supplying voltage to the window motor in the up or down direction based on switch input. DTC B1406 is set when the module detects that the driver power window 'Down' control circuit has shorted to ground, often caused by chafed or pinched wiring inside the door, a failed window motor, or a defective master switch. The module continuously monitors the circuit voltage and current draw, and logs the fault when it sees an unintended ground condition outside expec...

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