Confirmed on real Ocean cars. U199701 means: Lost communication with HV coolant heater H (cabin heating may not work).
How U199701 is built
| Part | Here | Means |
|---|---|---|
| System letter | U | Network |
| Base code | 1997 | What part or signal it is about |
| Failure type | 01 | Not one of the common failure types in the guide |
Some scan tools show only the first five characters (U1997) or put a dash before the failure type (U1997-01). More on how codes are built.
What to do
Many U-codes (lost communication, signal outdated, integrity check failed) appear after a module was asleep, the 12 V dipped, or software was updated, and often clear and stay clear. Codes that come back right after clearing, or that come with a warning on the car's screen, point to a real problem.
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).