Code Definition

B1550 — Power Window Master Circuit Short To Ground

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

About B1550

B1550 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 B1550 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.

B1550 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 Driver Door Module (DDM) monitors the master power window switch circuit for abnormal voltage levels, and the input lines should sit at a defined reference value when the switches are at rest. DTC B1550 is set when the control module detects a short to ground condition on the master power window circuit, meaning one of the switch input lines is being pulled to zero volts when it should not be, indicating an unintended connection to chassis ground or a low side circuit. This commonly results from chafed insulation where the harness contacts the metal door shell,...

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