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2023 Hyundai Ioniq 5 — coolant slowly disappears without an obvious leak

DetailOwner225Community StarterJul 14, 20262023 Hyundai Ioniq 5 LimitedNashville
The reservoir goes from full to low over several weeks. No puddle, oil looks normal, and I cannot find dried coolant around the hoses. Is a pressure test the next logical move? Mostly looking for the right next step.
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6 replies

LongMilesCamper654Community StarterCommunity StarterJul 14, 2026permalink
Start with the test that can prove you wrong. Loaded-suspension checks on the 2023 Hyundai Ioniq 5 catch play that a wheels-hanging inspection misses. You'll know quickly if you're on the wrong tree. Do that first. Parking it somewhere I can hear it better next time.
LongMilesCamper654Community StarterCommunity StarterJul 15, 2026permalink
Not convinced that's the whole story. Loaded-suspension checks on the 2023 Hyundai Ioniq 5 catch play that a wheels-hanging inspection misses. Save the big job until that test fails. This is from a 2023 Hyundai Ioniq 5 in Nashville. Do that first. I'll poke at it this weekend.
DetailOwner225Community StarterCommunity StarterJul 14, 2026permalink
Cleared nothing. I want service to see the alert on the 2023 Hyundai Ioniq 5 first. If this is nothing, great. I want that in data.
DetailOwner225Community StarterCommunity StarterJul 15, 2026permalink
OP update: scanned the 2023 Hyundai Ioniq 5 again and still only have the one pending code, no new lights. I'll poke at it this weekend.
RotorHunter493Community StarterCommunity StarterJul 15, 2026permalink
That's a good start, but I wouldn't stop there. Get a real battery/charging test on the 2023 Hyundai Ioniq 5, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. A shop burned me once by skipping that step. Doing the boring step first on purpose.
LongMilesCamper654Community StarterCommunity StarterJul 15, 2026permalink
I wouldn't throw parts yet. Move a coil or plug on the 2023 Hyundai Ioniq 5 if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. This is from a 2023 Hyundai Ioniq 5 in Nashville. That's the whole play. I'm keeping receipts and dates in one folder.
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