BMW M4 2015–2018 — technical service bulletin
Bulletin B122216 · NHTSA communication 10152658 · issued Nov 1, 2018
Technical service bulletin
communication type
Engine and Engine Cooling
component
2015–2018
model years
4
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. Corrosion in the water injection valve block.
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.