Code Definition

B1231 — Longitudinal Acceleration Threshold Exceeded

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

About B1231

B1231 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.

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.

B1231 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 Longitudinal Acceleration Sensor is a MEMS based accelerometer used by the stability control system, airbag module, or body control module to measure forward and rearward G forces on the vehicle, providing data that supports hill hold, rollover detection, traction control, and crash event logging. DTC B1231 sets when the control module sees a longitudinal acceleration reading that exceeds its calibrated threshold, which is treated as either a valid high G event such as a collision or heavy braking, or as an implausible sensor output caused by a wiring, mounting, or internal sensor fault. O...

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