Code Definition

B0086 — Supplemental deployment loop Circuit resistance low - Circuit number 2

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

About B0086

B0086 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 B0086 is stored, the module has detected a signal or supply voltage lower 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.

Because B0086 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 airbag control module (ACM) monitors each supplemental deployment loop for correct resistance so it can confirm the assigned squibs are ready to fire when commanded during a crash event. DTC B0086 sets when the ACM detects that the resistance in Supplemental Deployment Loop Number 2 has fallen below the calibrated low threshold, indicating a short across the loop wiring, an internally shorted squib on the loop, or a low resistance leakage path in a shared connector. Supplemental loops typically cover secondary devices such as side airbags, curtain airbags, second stage inflators, or knee a...

Join TaT to view the complete code information and diagnostic details.

Quick Facts