Code Definition

B2154 — Front Echo Sensor Circuit Failure

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

About B2154

B2154 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 B2154 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 B2154 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 B2154 fault code indicates that the park assist control module has detected an electrical failure in the front echo sensor circuit. Echo sensors are ultrasonic transducers mounted in the front bumper that emit a high frequency pulse and listen for the reflected echo from nearby objects to calculate distance for the front park assist system. The module sets this code when a sensor fails to respond to a transmit command, when it draws abnormal current, or when the expected echo return signal is missing or out of specification. When set, the driver typically loses some or all of the front par...

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