The battery range must drop over 30% within the warranty period or fail in some way during that period. Given your lack of details, who knows whether it applies to your car or not?

 

GM extended the warranty on Gen 2 Volts to 15 years 150,000 miles. The EPA range is 53 miles, so the warranty is invoked at 70% or 37 miles. Good luck.

 

This is all incorrect. See my comment…it’s not range related.
ALSO, GM hasn’t changed the warranty. It has always been 8 years/100k miles for most cars, and 10 years/150k miles for PZEV (now called TZEV) cars, only if they are currently registered in a PZEV state. This is all spelled out in the warranty manual that came with your car. (Perhaps you were thinking of the BECM which now has a special warranty.)

 

My 2018 Gen 2 Volt has about 75K miles on it, and I do not perceive any battery degradation. Range varies more with speed and outside temperature. I got fifty miles of range a few weeks ago with no freeway driving (45 MPH Max). Not sure how you can corner GM on range when it varies with conditions, but there are catastrophic failures eventually.

 

Also bear in mind that most who qualify wait over for years for a new battery to arrive. There was one recent exception, but the norm is a very long wait.

 

Gee. Lots of bad info here.
The warrant is not based on mileage at all! (There are too many variables that affect mileage besides battery capacity.) And it has nothing to do with HOLD mode.

GM considers a battery to not have met its warranty requirement if the “battery capacity” drops by 30% on gen-1, or 40% on gen-2. The car calculates a battery capacity value that is available thru diagnostics. You can read that value with an OBD adapter and the MyVoltControl app (iOS) or Voltage app (Android). If you do take your car in for low capacity, the dealer will first do a “capacity relearn” which causes a new capacity calculation with the latest data to verify that it is really faulty. And as stated, you’d be very lucky to get a replacement battery at all.

 

I've had my 2016 Volt at the dealership since June waiting for a battery. Since there seemed to be no replacement batteries in the supply system, I started calling around to get an estimate on a used battery replacement. I was just about to pull the trigger on that when I got the news from my Service Technician that they had gotten an email from the supply chain that said some kind of news was coming in about 2 weeks. This was about one week ago that I got this news. Anybody else hear anything?

 

The GM New Vehicle Warranty is intended to cover defects in materials and workmanship, not ordinary "wear and tear." The Volt’s high voltage battery is not a storage tank for "raw electricity," but rather a container filled with chemicals capable of creating a chemical reaction; chemical energy is converted into electrical energy (and electrical energy is converted back into chemical energy during recharging). Over time that chemical environment degrades; the capacity to convert chemical energy into electrical energy is reduced, resulting in loss of ev range.

If all cells lose capacity over time at about the same rate, the result is simple loss of range over time. This, I suspect, should rarely result in a loss of capacity large enough to meet GM’s warranty terms in a new Volt’s first 8 years of life. An uneven loss of capacity in the cells over time, on the other hand, can lead to the issues that may qualify for warranty coverage (i.e., could be evidence of defects in materials and workmanship).

GM’s battery warranty coverage language listing a simple loss of capacity limit (40% for Gen 2, 30% for Gen 1) was perhaps included for marketing purposes, not expecting any Volt driver to experience such "wear and tear" within the first 8 years. I note the 2019 warranty booklet for a Subaru PHEV says, "the battery will experience natural and gradual capacity loss over time... This gradual capacity loss is not covered by any Subaru warranty." The 2025 model year warranty guide for Ford cars and trucks states, "The high voltage battery will experience gradual capacity loss with time and use (similar to all lithium-ion batteries), which is considered normal wear and tear. Loss of battery capacity due to or resulting from gradual capacity loss is NOT covered under the New Vehicle Limited Warranty."