P3466
Cylinder Deactivation Hydraulic Circuit Bank 1 Open
What it means
The engine control module has detected an open hydraulic circuit in the cylinder deactivation system on bank 1. The system uses pressurized engine oil routed through dedicated lifters and oil control valves to collapse valves; an open circuit indicates loss of oil flow or a failed pressure switch.
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
Oil pressure switch failed
highOne of the most commonly reported causes for this code — check this first.
Oil passage blocked or sludge buildup
mediumA plausible cause — test and verify before replacing parts.
Oil control valve stuck
mediumA plausible cause — test and verify before replacing parts.
Related help
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