Code Definition

B1570 — Lamp Headlamp High-Beam Circuit Short To Ground

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

About B1570

B1570 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 B1570 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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.

B1570 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 B1570 fault code indicates that the Body Control Module (BCM) has detected a short to ground condition on the high beam headlamp supply circuit. The BCM monitors current draw and voltage on the high beam output, and a short to ground typically presents as excessive current flow that pulls the supply voltage well below normal operating levels. The code is set when the module sees an overcurrent event, a sudden drop in supply voltage, or a stuck low signal on the high beam circuit consistent with a wire or component shorted to chassis ground. When this code is active the high beams may not i...

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