Code result
P3457
Cylinder 7 Deactivation
Moderate severity
What it means
The engine control module has detected a fault in the cylinder 7 deactivation system. Cylinder 7 cannot reliably switch between active and deactivated state.
Is it safe to drive?
Use caution
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
Deactivation solenoid failed
highOne of the most commonly reported causes for this code — check this first.
Lifter stuck
mediumA plausible cause — test and verify before replacing parts.
Related help
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