Bolt owners were told to stop charging past 90% and to park away from the house

A federal safety recall tied to a rare battery flaw once told tens of thousands of Chevrolet Bolt owners to change how they lived with their own car: stop charging past 90%, avoid running the pack down too far, and park outside instead of in an attached garage. The instructions sounded extreme for a mainstream electric vehicle, but they came directly from General Motors and the National Highway Traffic Safety Administration after a string of battery fires traced back to manufacturing defects inside individual battery cells.

The guidance applied to 2020-2022 Chevrolet Bolt EV and 2022 Bolt EUV models built with high-voltage battery cells supplied by LG Energy Solution’s Korean manufacturing plants, covering roughly 52,000 vehicles under NHTSA campaign number 21V650000.

Two rare defects had to occur in the same cell

According to GM’s official Part 573 safety recall report filed with NHTSA, the root cause was “the simultaneous presence of two rare manufacturing defects in the same battery cell.” Individually, either flaw was uncommon; together, in a single cell, they created a short-circuit risk capable of igniting the surrounding battery module. GM’s filing noted the condition “appears to be aggravated by routinely charging the battery to a full or nearly full state of charge after it has been substantially depleted,” which is why the interim fix focused on charging behavior rather than an immediate parts swap. The company said the battery could “emit smoke or heat,” potentially melting the pack and nearby vehicle components before a driver had any warning something was wrong.

Why 90% became the magic number

GM told owners to use the vehicle’s Target Charge Level mode to cap charging at 90% of capacity while the company worked through a full remedy. That single setting change was the centerpiece of the interim measures, alongside a request to charge more frequently and never let the battery drop below roughly 70 miles, or about 113 kilometres, of remaining range. The goal was to keep the pack away from the two extremes, full and nearly empty, where the defective cells were considered most likely to overheat. Owners who were uncomfortable adjusting the setting themselves were told to have a dealer do it for them rather than skip the step.

Why GM said park outside, not in the garage

The recall report also asked owners to “park their vehicles outside immediately after charging and not leave their vehicles charging indoors overnight” as “an abundance of caution.” That instruction had little to do with preventing a fire and everything to do with limiting the damage if one still happened; a fire in a driveway is a very different event than one inside an attached garage overnight while a household sleeps. It was a stopgap aimed at buying time, not a permanent answer, and GM was explicit that it applied only until the underlying hardware itself was replaced.

An expansion of an earlier, smaller recall

The 21V650000 campaign was not GM’s first attempt to address Bolt battery fires. It expanded an earlier July 2021 recall, 21V560, that had covered 2017-2019 model year Bolts built with an earlier battery cell design. After GM’s Customer Assistance Center logged a fire report in a vehicle outside that original recall’s scope, and LG’s teardown analysis of returned cells found the same pair of defects could exist in cells installed in later vehicles, GM’s safety and field-action decision authority expanded the recall in August 2021 to include every remaining 2019 Bolt, plus all 2020-2022 Bolt EV and 2022 Bolt EUV vehicles. GM’s filing put the affected population at 52,403 vehicles, split between roughly 45,000 Bolt EVs and about 7,400 Bolt EUVs, with an estimated 1% defect rate among them.

A costly pause in Bolt production and sales

The scope of the fire risk was serious enough that GM halted Bolt EV and Bolt EUV production at its Orion Assembly plant in Michigan in August 2021, a shutdown that lasted, aside from a brief restart that November, until the line resumed on April 4, 2022, according to recall-progress reporting from Green Car Reports based on GM’s own quarterly filings with NHTSA. Battery supplier LG separately agreed to pay GM $1.9 billion to cover the cost of the recall, an acknowledgment of where responsibility for the underlying cell defects fell even as GM managed the fix and the interim charging rules for owners.

The permanent fix: full battery module replacement

The interim steps were always meant to be temporary. GM’s stated remedy was to replace the defective battery modules, built after LG corrected the manufacturing process responsible for the flaw, at no cost to owners since every covered vehicle remained under warranty. Owner notification letters describing the process went out in waves, first in October 2021 and again in June 2023 as more vehicles became eligible once replacement parts reached dealers, according to recall records compiled by Destination Charged’s EV recall tracker. Owners who are still unsure whether their vehicle has had the work completed can contact GM’s dedicated Bolt EV Concierge Team or look up their VIN directly through NHTSA.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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