Code Definition

B0068 — Roof rail module LH deployment loop Circuit malfunction

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

About B0068

B0068 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 B0068 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 B0068 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

DTC B0068 is stored by the Airbag Control Module (ACM) when it identifies a fault in the Left Hand (LH) roof rail airbag deployment loop, the firing circuit for the side curtain airbag mounted along the roof rail. The ACM continuously measures the resistance of this loop and sets the code for an open circuit, a short to ground, a short to voltage, or any resistance reading that falls outside the calibrated limits. Because the curtain airbag is a pyrotechnic device that drops down over the side glass to protect occupants in a side impact or rollover, the firing loop must remain electrically sou...

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