Code Definition

B2177 — Interior Scanning Sensor Circuit Failure

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

About B2177

B2177 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 B2177 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 B2177 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 Body Control Module (BCM) or Anti Theft Control Module monitors the Interior Scanning Sensor, which is an ultrasonic motion sensor mounted inside the vehicle cabin (typically in the overhead console or in the rear parcel shelf) used to detect intruder movement while the security system is armed. DTC B2177 is set when the BCM detects a circuit fault on the interior scanning sensor input, such as an open circuit, short to ground, short to power, or a signal that falls outside the expected operating range during the sensor's self check. The sensor is powered when the alarm is armed and return...

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

Quick Facts