GM Faces Class Action Lawsuit Over AFM Lifter Failures on C7 Corvettes and Other GM V8 Models


GM Faces Class Action Lawsuit Over AFM Lifter Failures on C7 Corvettes and Other GM V8 Models

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All six years of the seventh generation Corvette are among the cars included in a class action lawsuit filed this week against General Motors, alleging that a lifter recall should be ordered for GM vehicles with 5.3-liter, 6.0-liter, or 6.2-liter V8 engines.

The suit was filed by nine plaintiffs in the U.S. District Court for the Eastern District of Michigan: Harrison, et al., v. General Motors LLC.

At issue are the valve train systems, active fuel management lifters, and dynamic fuel management lifters, said in the suit to be defective in certain Buick, Cadillac, Chevrolet, and GMC vehicles.

The plaintiffs want to see a lifter recall issued for the following vehicles:

2014-present Cadillac Escalade
2016-2019 Cadillac CTS-V
2014-present Chevrolet Silverado
2014-present Chevrolet Silverado 1500
2014-2019 Chevrolet Corvette
2014-present Chevrolet Suburban
2014-present Chevrolet Tahoe
2016-present Chevrolet Camaro
2014-present Chevrolet Camaro SS
2014-2016 Chevrolet Corvette
2014 to present GMC Sierra
2014 to present GMC Sierra 1500
2014-present GMC Yukon
2014-present Yukon XL

The suit alleges the defective nature of the valve train systems – which are designed to control some of the 16 lifters periodically to decrease fuel consumption by keeping some of the valves from opening and allowing fuel to enter when only partial power is required, such as during highway cruising.

According to the suit, these systems consist of software run by the engine control module, specially designed and manufactured lifters, and other valve train components like the valve lifter oil manifold.

The suit alleges that these systems malfunction and prematurely fail for several reasons, including non-conforming design specifications, failure to account for the expansion and contraction rates of the lifters and the engine block, and failure to consider the increased pressure on the AFM lifters.

Replacement parts provided by GM have been shown to be equally defective and continue to fail, causing a ticking noise from the engine, the plaintiffs allege.

While a lifter recall hasn’t been issued by GM, the company has agreed to cover repairs through extended warranties known as Component Coverage, if vehicle owners have had two or more repairs at dealerships for the valve train and lifter problems. The suit argues, however, that the extended coverage is only provided if the owner has already repaired the damage twice.


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  1. I replaced the lifters and push rods plus installed a rocker arm trunion kit in my C7 GS early on. We also disabled the Eco mode (4 cylinder) in the ECM. Who wants to drive a 4 cylinder Corvette?

  2. Wonder why the 2007 to 2013 Tahoes and Suburbans were included in this? They were the first adopters and had a ton of problems which included whole engine replacement.
    I wonder if the C8 has a equivalent Range module to deactivate it yet? I kind of doubt it since apparently the ECM software is heavily encrypted.

  3. Used Eco mode on first day of ownership and it sounded stupid as M7 GSs have no AFM valves. Never been on since and also tuned it off in the ECM.

  4. A heads up for the C7 guys:

    Even if you’re NOT in Eco mode on the A8 and you’re not accelerating much (i.e., cruising) the computer will still force V4 mode. You bypass this by putting it in manual mode if you do not want v4 mode and the issues it brings long term. Honestly MPG was not better in eco mode anyway. It only makes your car sound like a broken 95 Civic and slowly screw your engine.

    And the M7 doesn’t have this issue which why it, once again, is the superior transmission choice for a C7.

  5. So GM only offers a warranty repair after a “GM dealer has fixed it twice.”
    Such arrogance should be rewarded by customer boycott since class action lawsuits
    are usually decided in favor of manufacturers.


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