Code Definition

B2570 — Right Lamp Outage Signal Circuit Short to Ground

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

About B2570

B2570 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 B2570 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 B2570 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

On vehicles equipped with a lamp outage detection module (sometimes called a lighting control module or trailer tow module), the Body Control Module monitors a dedicated feedback signal wire that the lamp outage module pulls low to report a bulb out condition on the right side exterior lighting circuits. DTC B2570 is set when the BCM detects that the right lamp outage signal wire is shorted to ground for longer than the calibrated threshold, indicating that the feedback line is stuck active rather than reporting genuine lamp out events. The lamp outage module senses current through individual ...

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