Code Definition

B0077 — LHF side airbag Sensor Circuit malfunction

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

About B0077

B0077 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 B0077 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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 B0077 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) uses input from the Left Hand Front (LHF) side impact sensor to detect a side collision and command deployment of the corresponding side airbag, curtain airbag, and pretensioner. On most modern vehicles this sensor is a satellite accelerometer or pressure sensor mounted low on the driver door, B pillar base, or door pillar cavity, and it communicates with the ACM either over a dedicated hardwired pair or via a peripheral SRS bus. DTC B0077 sets when the ACM detects an open, short to ground, short to voltage, or invalid signal condition on the LHF side airbag sen...

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