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U0297 Hoog Generiek / SAE

U0297: Communicatieverlies met de regelmodule B van de AC/DC-omvormer

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Wat te doen

The car will still charge, but roughly half as fast — because it has two chargers and one has dropped out.

The useful thing to know is that this is not your battery wearing out, which is what it looks like. A tired battery holds less charge; this makes the car take longer to reach the same charge. If it still gets to 100% but takes about twice as long as it used to, that is this fault, not degradation — and unlike degradation, it is fixable. Worth saying clearly, because the two get confused constantly.

Another clue: rapid DC charging will be unaffected. Rapid chargers bypass the part that has failed, so if the car still rapid-charges at full speed but home charging has halved, that confirms it.

Meanwhile plan for longer charging times rather than being caught out.

Ask for the 12-volt battery to be tested first — a weak one causes charging faults on electric cars and is cheap and commonly missed. And do not investigate the charging system yourself; the voltages involved can kill.

Wat deze code betekent

The second AC to DC converter control module has stopped being heard from. See U0296 for what an on-board charger does and why losing it stops the vehicle being refuelled.

A second on-board charger exists to charge faster from AC. A single unit is limited by what it can convert and dissipate, so vehicles offering higher AC charging rates — the ones that can use a three-phase supply or a high-power home installation — do it by fitting two converters and splitting the load.

The consequence is more forgiving than at U0296 and worth predicting: charging usually still works, at roughly half the rate.

That produces a complaint that sounds like a battery problem and is not. An overnight charge that used to finish by morning now does not. A top-up on a journey takes twice as long. The natural conclusion is that the battery has degraded — and the actual cause is that half the charging hardware is unavailable.

The distinguishing evidence is available to any owner: charging rate, not charging capacity. A degraded battery holds less energy but still accepts it at the normal rate. A missing charger accepts the same energy at half the speed. If the car still reaches full charge but takes far longer to get there, that is this rather than a worn battery — and worth saying, because battery degradation is not a repairable thing and this is.

Rapid DC charging is unaffected, for the reason given at U0296: it bypasses the on-board chargers entirely. So a vehicle whose home charging has halved will still rapid-charge at full speed, which is another piece of evidence pointing here.

The ordinary causes apply, and the 12-volt battery deserves its check first as at U0293 and U0296.

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