BMW fault code 33B100

33B100 is a fault stored in your BMW's memory (an ISTA fault code, not a standard OBD-II P-code).

What it means:
Vehicle electrical system voltage insufficient when attempting to start the engine (intermittent). Usually a weak/aging battery; sometimes the alternator, parasitic drain or corroded terminals. Test the battery (>12.4 V at rest) and charging.

Related codes: 336589 · 33C912

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