P3259Critical SeverityEngine

Cylinder deactivation (AFM/MDS) Code 59

What This Means

This code indicates the cylinder deactivation (AFM/MDS) system has detected an abnormal operating condition. Code P3259 monitors cylinder management and exhaust aftertreatment components.

Common Symptoms

Check engine light on
Performance concern
Emissions issue
Engine management change

Common Causes

Component degradation
Sensor failure
Actuator malfunction
System contamination
PCM monitoring issue

Estimated Repair Cost

$325 – $1500

Parts and labor (varies by vehicle and location)

Difficulty:Professional

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.