BMW M4 2015–2017 — technical service bulletin
Bulletin B122216 · NHTSA communication 10146815 · issued Sep 1, 2016
Technical service bulletin
communication type
Engine and Engine Cooling
component
2015–2017
model years
3
vehicle entries
Official summary
"""WATER INJECTION SYSTEM - WATER LEVEL TOO LOW"". Check Control (CC) Message ""Water level too low, engine performance only available to a limited degree"" is displayed. A fault may be stored in the DME control unit: - 0x124015 - Water injection system, working area: Pressure too low - 0x124013 - Water injection system, reversible flow valve, plausibility: No pressure reduction. Software malfunction in DME control unit."
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.