P3490
Cylinder Deactivation System Performance Bank 1
What it means
The engine control module has detected that the cylinder deactivation system on bank 1 is not performing as expected. Closed-loop monitoring of pressure response, valve timing or misfire counters during transitions indicates the system fails to deactivate or reactivate cylinders within calibrated limits.
Is it safe to drive?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Switching lifter stuck or worn
highOne of the most commonly reported causes for this code — check this first.
Insufficient oil pressure
mediumA plausible cause — test and verify before replacing parts.
Solenoid slow or contaminated
mediumA plausible cause — test and verify before replacing parts.
Related help
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