Yes, you are in great danger if the system suddenly fails. Currently the system is warning you that it will fail in the not-too-distant future.

The SBC pump and accummulator (the two parts most likely in question) can be rebuilt at significant savings. That's my plan when the time comes.

You need to get the codes read by someone who has the necessary software.

In my opinion the first message that the system gives is not nearly urgent sounding enough.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife