Confirmed on real Ocean cars. C21A531 means: Front camera: no signal on its Ethernet link (timeout).
How C21A531 is built
| Part | Here | Means |
|---|---|---|
| System letter | C | Chassis |
| Base code | 21A5 | What part or signal it is about |
| Failure type | 31 | Usually: no signal |
Some scan tools show only the first five characters (C21A5) or put a dash before the failure type (C21A5-31). More on how codes are built.
Module it names
The meaning names a module Ocean Live scans: FCM (Front camera).
What to do
Clearing codes does not fix anything. It only resets the records; if the cause remains the code returns. Airbag (ACU), brake (ESP, IBOOSTER), steering (EPS) and high-voltage (BMS, PDU, PIU, MCU) faults should go to a qualified shop.
- Scan in Ocean Live: Faults→Scan all modules. Tap the code for what it affects, possible causes and how it's fixed, when known.
- Tap Share report before clearing anything, to keep the history a workshop would use.
- Not sure? Tap the round ? and ask "Any questions?".
The states the app shows: active (the fault is present now), pending, stored (happened before), warning lamp (the module asked for a warning light).