Code Definition

B2527 — Left Rear Stop lamp Circuit Failure

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

About B2527

B2527 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 B2527 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 B2527 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 left rear stop lamp circuit through a feedback line that detects current draw when the brake pedal is depressed. DTC B2527 is set when the BCM detects that current flow on the left rear brake light output is outside expected parameters, indicating an open circuit, short, or failed bulb. The left rear stop lamp provides a critical safety signal to following traffic and is monitored continuously by the BCM whenever the brake light circuit is energised. When this code is set, the left brake light may fail to illuminate, the dash may show a brake light wa...

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