Code Definition

B1501 — Lamp Turn Signal Left Circuit Short To Battery

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

About B1501

B1501 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 B1501 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.

B1501 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 lighting control module controls the left turn signal lamps by switching the supply on and off at the flash rate, and monitors the output for unexpected voltage on the wire when it should be off. DTC B1501 sets when the module sees battery voltage on the left turn signal output circuit at a time when the driver is open, indicating a short to a constant 12V source (typically a chafed wire contacting a fuse panel feed, brake light feed, or trunk light feed). The fault may stay latched until the wiring is corrected because the unintended supply keeps energising th...

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