AFM/DFM lifter failure causing a tick, misfire and lost cylinder.
- Typically appears
- 80,000+ miles
- What to inspect
- Listen for lifter tick and check for misfire codes; ask about any lifter work.
The 4th-gen Tahoe is a capable full-size SUV, but the 5.3L V8's Active Fuel Management lifters are the critical check.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed July 2026
AFM/DFM lifter failure causing a tick, misfire and lost cylinder.
Oil consumption linked to AFM.
6-/8-speed shift quality and shudder.
Cracked dashboard (recall/campaign).
Generate a full, tickable pre-purchase checklist tailored to this exact vehicle — add photos and notes as you inspect.
Generate a free checklistStrong overall, but the 5.3L AFM lifter failure is a well-known, expensive risk.
Active Fuel Management lifters can collapse, causing misfires; disabling AFM is a common preventative.
AFM engines can consume oil; monitor the level closely.
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.