Code Definition

B2143 — NVM Memory Failure

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

About B2143

B2143 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 B2143 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

DTC B2143 is set when a control module performs a self test of its Non Volatile Memory (NVM) and detects that the memory device itself has failed read or write operations, returned a bad checksum, or is otherwise unable to reliably store and retrieve data. Unlike B2141 (configuration failure) and B2142 (transmitter ID code failure), this code points to a hardware level fault with the NVM chip inside the affected module rather than to corrupted data alone. The reporting module may lose configuration data, security identifiers, learned values, and counters because they cannot be written and reta...

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