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P3401 — Cylinder 1 Deactivation Control Performance

Cylinder 1 deactivation actuator not performing correctly.

Severity: MediumRepair: $200-$3,000Difficulty: Advanced

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Common symptoms of P3401

Common causes of P3401

Repair cost & difficulty

Typical cost to fix P3401: $200-$3,000 · Difficulty: Advanced

Pro tip: A collapsed AFM lifter on GM V8s requires camshaft removal. Many owners replace all AFM lifters with standard lifters and delete the system.

Vehicles commonly affected

GM (AFM), Chrysler (MDS)

Related trouble codes

P3400P0301

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.