1. EV Battery Failures

A) The problem Individual battery cells or entire high-voltage packs in certain electric SUVs have failed or required replacement. Affected models include the Honda Prologue (GM Ultium-based), Kia EV6, Kia EV9, and Genesis GV60. Issues include battery coolant problems, high-voltage system warnings, reduced capacity/charging limits, and pack or module failures. CR data and owner reports flag EV battery as a key trouble area contributing to low predicted reliability scores (e.g., Prologue ~25, EV6 ~25, EV9 ~24, GV60 ~21).

How long do I have to wait

B) Consequences and excerpted complaints Consequences include sudden loss of range or power, inability to charge, “Service High Voltage System” warnings, limp mode, reduced acceleration, vehicle becoming undrivable, lengthy dealer stays (parts backorders common), and potential safety risks if power is lost while driving. Battery replacement is extremely expensive outside warranty (often tens of thousands of dollars).

• Honda Prologue owners have reported high-voltage warnings during charging, loss of cabin heat, and battery coolant pressurization or leakage issues requiring service; one described repeated battery warning lights and a failed initial repair before coolant repressurization fixed it (CR owner comments).
• Other Prologue reports include high-voltage system faults leading to charging interruptions, reduced power, and in some cases full battery or related component replacement.
• Genesis GV60 and related Hyundai/Kia EVs have seen electrical system errors limiting charge (e.g., to 60%) and requiring battery or related high-voltage work.

C) Potential legal claims

• Breach of express warranty: Manufacturer's written limited warranty (typically 8–10 years/100,000 miles on EV batteries) covering defects in materials/workmanship.
• Breach of implied warranty of merchantability (UCC Article 2): Vehicle not fit for ordinary purposes of an EV (reliable propulsion and charging).
• Magnuson-Moss Warranty Act (15 U.S.C. § 2301 et seq.): Federal claim for failure to honor written or implied warranties on consumer products; may allow recovery of attorney fees and costs if successful.
• State lemon laws: Repeated unsuccessful repair attempts for a substantial defect impairing use/value/safety within the statutory period.
• Deceptive/unfair practices (state UDAP statutes or FTC Act analogs): If marketing emphasized battery reliability, longevity, or “peace of mind” while known issues existed.

D) Sources Consumer Reports 10 Least Reliable Cars of 2026 and related reliability pages; CR EV vs. gas reliability analysis; NHTSA/owner forum reports,  summaries of Prologue high-voltage issues; CR owner satisfaction comments.

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