What it means
30FF — Turbocharger, charge-air pressure too low (underboost). BeeEmUu groups this code under Turbo & charge air with a severity of Service soon.
30FFOverlay text
The community overlay file (community/dtc_texts.toml) carries a different short text for this code: “DME: clutch switch plausibility”. Where an opinions file disagrees, the opinions text above wins.
Provenance
The title and severity above are seeded from the open-research source of record: https://bmwtuning.co/bmw-n54-30ff-engine-fault-code-30ff-diagnosis-repair-guide/. BeeEmUu stores short factual descriptions only; no proprietary ISTA or OEM text is reproduced.
Related schematics
No schematic cross-link is seeded for this code yet. The schematic library holds the CC0 seed diagrams; community links are added over time.
Community repair opinions
No community opinion file exists for this code yet. Add one by opening a PR with community/opinions/30FF.toml.
Frequently asked
Is code 30FF safe to clear?
Clearing is only safe once you have read and recorded the freeze frame. Re-appearing after a clear is the useful signal; clearing without recording destroys it.
Is 30FF a BMW-specific or a generic code?
This is a BMW manufacturer hex code. A generic OBD-II tool will not show it — you need BMW-protocol access over K+DCAN or ENET/DoIP.