Code Definition

B2519 — High Mount Stop Lamp Circuit Failure

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

About B2519

B2519 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 B2519 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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 B2519 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) monitors the high mount stop lamp (CHMSL, also called the third brake light) circuit through a feedback line that detects current draw or circuit continuity. DTC B2519 is set when the BCM detects that the CHMSL circuit is operating outside expected parameters, typically due to an open circuit, short circuit, or failed bulb. The CHMSL is activated whenever the brake pedal is depressed, providing a third stop light mounted above the standard tail lamps for improved rear visibility in traffic. When this code is set, the driver may notice the third brake light failing...

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