Code Definition

B2528 — Left Rear Stop lamp Circuit Short to Battery

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

About B2528

B2528 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 B2528 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.

Because B2528 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 output and expects 0V on the feed wire when the brake pedal is not depressed. DTC B2528 is set when the BCM detects battery voltage on the left stop lamp circuit while the lamp should be inactive, indicating an unintended power source on the wire. This typically results from a chafed feed wire contacting a constant power supply, aftermarket lighting incorrectly tapped into the brake light circuit, or internal damage to the lamp assembly creating a back feed. Symptoms include the left rear brake light remaining illuminated continuou...

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