Code Definition

B1568 — Lamp Headlamp High-Beam Circuit Open

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

About B1568

B1568 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 B1568 is stored, the module has detected an open (broken or disconnected) electrical path 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.

B1568 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 B1568 fault code indicates that the Body Control Module (BCM) has detected an open circuit condition in the high beam headlamp supply circuit. The BCM monitors the high beam output for current flow when the headlamps are commanded on, comparing measured current against expected values for a normally functioning bulb load. This code is set when the module detects either no current flow or a current draw far below threshold, which is consistent with an open filament, broken wire, disconnected connector, or open relay contact. When this code is active the high beams typically do not illuminat...

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