Code Definition

B1420 — Passenger Power Window Motor Circuit Short To Battery

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

About B1420

B1420 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 B1420 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.

B1420 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) monitors the power window motor control circuits to detect electrical faults that could cause unsafe operation. DTC B1420 is set when the module detects a short to battery voltage condition on the passenger window motor circuit, meaning the circuit is being supplied with constant 12V from a source other than the module's own driver. The passenger window motor is normally driven by reversible polarity from BCM or door module driver outputs that are switched to ground or battery as needed for up and down operation. When this code is set,...

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