Which vehicles are affected?

Chevrolet Silverado 1500 (2007-2023), GMC Sierra 1500 (2007-2023), Chevrolet Tahoe (2007-2023), Chevrolet Suburban (2007-2023), GMC Yukon (2007-2023)

Is there a recall or warranty extension?

Class action: Harrison v. General Motors: Alleges premature AFM/DFM lifter failure; a 2026 ruling kept the Silverado and Sierra class together. No recall or warranty program for lifters was found. Recall 25V-274 (6.2L L87, 2025): A separate recall for crankshaft and connecting rod bearing defects on about 600,000 trucks and SUVs with the 6.2L. Check your VIN at nhtsa.gov/recalls.

Trouble codes › Known problems › GM V8 AFM/DFM lifter failure

GM V8 AFM/DFM lifter failure

Codes: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308

On GM 5.3L and 6.2L V8s with Active Fuel Management or Dynamic Fuel Management (Silverado, Sierra, Tahoe, Suburban, Yukon), a misfire on one cylinder with a ticking noise is a well-known sign of a collapsed or stuck valve lifter, usually a bigger repair than plugs or coils.

Can I keep driving? Not if you can avoid it.

A lifter that has collapsed can damage the camshaft and cause a heavy misfire that ruins the catalytic converter. If there's a loud tick and a misfire (or a flashing check-engine light), drive as little as possible until it's checked.

Which vehicles

Chevrolet Silverado 1500 2007-2023
GMC Sierra 1500 2007-2023
Chevrolet Tahoe 2007-2023
Chevrolet Suburban 2007-2023
GMC Yukon 2007-2023

Why it happens

Active and Dynamic Fuel Management shut off cylinders to save fuel using special lifters that can collapse. When one sticks or collapses, its valve stops opening properly, so that cylinder misfires and the engine ticks.

A class action (Harrison v. General Motors, Eastern District of Michigan) alleges premature failure of these lifters in 5.3L, 6.0L and 6.2L V8s. As of our research there was no NHTSA safety recall for the lifter problem. (The 2025 recall of 6.2L L87 engines, 25V-274, is a different defect: crankshaft and connecting rod bearings.)

Symptoms

Ticking or tapping from the top of the engine, often on one side
Misfire on one cylinder (P0301-P0308), rough idle
Check-engine light, sometimes flashing

How to confirm it

Rule out the cheap causes first: swap the ignition coil and plug with another cylinder and see whether the misfire moves.
A compression test or a relative compression test can show a cylinder whose valve isn't opening.
A shop can confirm a collapsed lifter by checking valve lift (rocker movement) on the misfiring cylinder.
Check for recalls and bulletins for your VIN, and for 6.2L L87 engines check recall 25V-274 separately.

The repair

Replacing the lifters (and usually the lifter guides and the camshaft if it's damaged) means removing the cylinder heads; it's a big repair. Get a firm quote and ask whether the camshaft needs replacing.
Some owners convert to non-AFM/DFM parts and tune the engine to disable cylinder deactivation; that's a bigger decision that can affect warranty and emissions compliance.

Recalls, bulletins and warranty programs

Class action: Harrison v. General Motors: Alleges premature AFM/DFM lifter failure; a 2026 ruling kept the Silverado and Sierra class together. No recall or warranty program for lifters was found.
Recall 25V-274 (6.2L L87, 2025): A separate recall for crankshaft and connecting rod bearing defects on about 600,000 trucks and SUVs with the 6.2L. Check your VIN at nhtsa.gov/recalls.

Programs can expire or depend on your VIN. Check nhtsa.gov/recalls and ask a dealer to run your VIN for open recalls, bulletins and extended coverage.

Is this what's happening to yours?

iRepair researches your exact year, engine and codes (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.

Ask iRepair about your vehicle

Sources

Researched October 2026 from service bulletins, recall records and repair-industry reporting. Your vehicle may differ; confirm with your service information and a dealer before paying for major repairs.