Code Definition

B2128 — Central Lock Motor Failure

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

About B2128

B2128 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.

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 B2128 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

B2128 is set when the body control module (BCM) detects a failure of the central door locking motor circuit, typically based on monitoring of motor current draw, response time, or feedback during a lock or unlock command. The central lock motor is the electric actuator inside a door that drives the lock mechanism between locked and unlocked positions when commanded by the body control module. When the BCM issues a lock or unlock command and the motor either fails to draw the expected current, draws excessive current, or fails to complete its travel in the expected time, the module flags this D...

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