NVM TIC Failure
The vehicle's non-volatile memory (NVM) that stores odometer and trip data has failed to write or verify correctly, similar to a corrupted hard drive that can't save files properly. This is a critical data integrity issue that affects instrument cluster functions and may prevent proper vehicle operation or certification.
The ECU continuously writes trip data, odometer values, and diagnostic information to non-volatile memory and performs periodic integrity checks via a TIC (Total Integrated Checksum) algorithm. When the checksum fails to match expected values or write operations are interrupted, the NVM TIC Failure code is triggered, indicating corrupted or inaccessible memory.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| NVM Checksum Verification | Checksum matches expected value on each write cycle | Checksum mismatch or write failure detected |
| Data Integrity Check | All stored values readable and consistent | Unreadable or inconsistent memory data detected |
Code B2142 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2142 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.