A ticking engine, a flashing check-engine light, a rough idle, or a misfire code on a new GM truck or SUV can point to a valve lifter problem. Lifter failures have been reported on GM's 5.3L and 6.2L V8 engines with Active Fuel Management (AFM) or Dynamic Fuel Management (DFM), which shut off cylinders to save fuel.

GM's 2024 Service Update

In 2024 GM issued a service update (N242442140) directing dealers to inspect certain new, unsold vehicles with the 5.3L (L84) engine for a potential misfire condition before delivery. A service update is not a safety recall, and it does not mean every 5.3L engine is defective. But if your vehicle has the symptoms, the dealer should diagnose and repair them under warranty.

Common Symptoms

  • Ticking or tapping from the engine
  • Misfire codes, a flashing check-engine light, or reduced power
  • Rough running when cylinders deactivate
  • Repeat lifter or camshaft replacement

When It Becomes a Lemon Law Claim

If the same misfire or lifter problem has been repaired three or more times and keeps coming back, or the repairs have kept the vehicle out of service 30+ days within 24 months of delivery, the Florida presumption may apply.

How Florida's Lemon Law Applies

Florida's Motor Vehicle Warranty Enforcement Act (Fla. Stat. ch. 681) covers new vehicles bought or leased in Florida and used primarily for personal, family, or household purposes. The key rules:

  • 24-month Lemon Law Rights Period, measured from the date the vehicle was first delivered to the consumer.
  • A presumption that the vehicle is a lemon if, during that period, the same defect has been through 3 or more repair attempts and still exists (after the manufacturer's final repair attempt), or the vehicle has been out of service for repair of one or more defects for a cumulative 30 or more days.
  • Written notice to the manufacturer, sent by registered or express mail, is required before the presumption can be used. The manufacturer then gets a final repair attempt.
  • Remedy: a repurchase (refund) or a comparable replacement vehicle, less a reasonable offset for use. The consumer may choose the refund.
  • Exclusions: trucks over 10,000 pounds gross vehicle weight, off-road vehicles, and motorcycles are not covered.

See our Florida Lemon Law overview and how many repair attempts for more detail.

Documents to Gather

  • Every repair order (RO), with dates in and out, mileage, your complaint, and what the dealer did
  • Your purchase or lease contract and window sticker
  • Any written notice you sent to the manufacturer, and proof of registered or express mail delivery
  • Loaner or rental agreements (they help prove days out of service)
  • Recall and bulletin notices, texts, and emails from the dealer or manufacturer

Statewide Florida Representation

We represent owners in all 67 Florida counties, from Miami and Tampa to Jacksonville and the Panhandle. Case review is by phone and email, with no office visit needed.

Frequently Asked Questions

Is a lifter replacement a "major" repair?

It often involves removing cylinder heads and can take days or weeks. Each visit counts toward attempts and days out of service.

Related Pages

This page is general information, not legal advice. Recall and bulletin details come from manufacturer filings with NHTSA and may change; whether a particular vehicle is covered depends on its VIN and facts.

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