Kangoo GPS Antenna Fault

Could be the antenna. Is it visibly damaged? Has anything hit it or been rubbing against it? Even a small crack can let moisture in and mess with the GPS signal.

No visible damage. It looks fine from the outside. But if moisture got inside, wouldn't that cause corrosion, like on an old battery terminal?

Exactly. If there's no visible damage and you're still getting that error code, it's highly likely the antenna is faulty internally. Time to visit a workshop. A replacement antenna shouldn't break the bank, probably around 200€ including fitting.

Thanks for confirming my suspicions. I've booked it into a local workshop. They quoted 200€ for a new antenna and fitting, which matches what you said. Hopefully, that'll sort it. I appreciate the advice!