Code Definition

B1031 — Ultrasonic Sensor Malfunction

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

About B1031

B1031 is a manufacturer-specific body diagnostic trouble code recorded for Honda vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1031 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.

B1031 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 Ultrasonic Sensor on Honda vehicles is an interior intrusion detection device, typically mounted in the overhead console or map light area, that transmits and receives ultrasonic waves to detect movement inside the cabin while the alarm system is armed. The sensor communicates its status back to the Multiplex Integrated Control Unit (MICU) or Body Control Module, which arms and disarms it along with the rest of the security system. DTC B1031 is set when the control module cannot establish correct communication with the ultrasonic sensor, or the sensor self reports an internal malfunction i...

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