Mazda CX-30 2018–2020 — technical service bulletin
Bulletin SA-061-20a · NHTSA communication 10180714 · issued Sep 10, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2018–2020
model years
9
vehicle entries
Official summary
If you receive a customer concern about the CHECK IN light coming on and DTC P3400 (cylinder deactivation system malfunction) stored, the cylinder deactivation oil control valve may be plugged with plastic debris from the oil filter wrapper. The debris may enter the center of the oil filter when poking a hole in the filter wrapper during removal, and then travel through the engine and plug the cylinder deactivation oil control valve.
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.