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Cylinder Deactivation Recall
Wish they would just have a option to disable cylinder deactivation as I see zero MPG gains from the previous engine. Maybe they can fix the jerky low speed issue too.
Manufacturer Recall Number 3719F
NHTSA Recall Number 19V-497
Recall Status Recall Incomplete, remedy not yet available
On certain subject vehicles, the powertrain control module (PCM) software controlling the hydraulic valve clearance adjuster may operate improperly when transitioning from cylinder deactivation to full cylinder activation modes while driving, due to inappropriate control logic of the PCM. As a result, an intake valve rocker arm may come out of position and make contact with internal engine parts, which may cause an engine misfire and loss of power and/or Malfunction Indicator Light (MIL) illumination.
In the worst case, engine damage may occur, resulting in engine stall while driving without ability to be restarted, which may increase the risk of a crash.
A Mazda dealer will reprogram the PCM with improved hydraulic valve adjustment control software, so that it may operate properly when transitioning from cylinder deactivation to full cylinder activation modes while driving.