EV-Specific Defects in California Lemon Law Cases

California is the largest EV market in the United States, and EV-specific defects have become a major share of Song-Beverly Act cases. EVs introduce defect categories that don’t exist in internal-combustion vehicles — battery degradation, charging-system failures, drive-unit replacements, and battery-management software bugs. Most of these clearly satisfy the substantial-impairment test when they persist after repair attempts.

Battery and range issues

Premature range loss

EV batteries naturally degrade over time, but excessive or rapid range loss is a Song-Beverly issue. If your vehicle was rated at 300 miles when new and loses 40% of that range within two years of normal use, the manufacturer’s warranty has likely been breached.

Manufacturers publish capacity-retention warranties (typically “70% capacity for 8 years/100,000 miles” or similar). When measured capacity falls below the warranty floor — and the manufacturer refuses battery replacement — you have a Song-Beverly claim.

Documentation tips:

• Track range over time. Tesla, Rivian, Lucid, and most other EVs display estimated range. Screenshots over time establish degradation.
• Note charging conditions consistently — fast-charging vs. AC, cold weather vs. moderate, etc.
• Save battery service-mode reports if the dealer performed them.

Battery management system (BMS) defects

The BMS controls how the battery charges and discharges. Software bugs in the BMS can cause:

• Inaccurate range estimates (vehicle thinks it has more or less range than it does).
• “Bricking” — battery becomes inoperable.
• Charging failures or limits below spec.
• Sudden range reductions after software updates.

Tesla, Hyundai/Kia, and Audi e-tron vehicles have all produced California cases involving BMS software issues.

Phantom drain

Excessive battery drain when the vehicle is parked. Common causes include faulty 12V batteries, software bugs that wake the vehicle too frequently, or sensor malfunctions. When phantom drain exceeds normal levels (more than ~2-3% per day), it can support a Song-Beverly claim if the manufacturer fails to repair it.

Charging system failures

DC fast-charging issues

Vehicles unable to accept the full DC fast-charge rate — or that throttle charging unexpectedly — can support Song-Beverly claims. Symptoms include:

• Charging speed materially below advertised maximum.
• Charging failures at specific networks (CCS, Supercharger compatibility).
• Charge-port hardware failures.
• Charging starts but fails mid-session.

AC home charging failures

Onboard chargers can fail, limiting home charging to slower rates or preventing charging entirely. Replacing an onboard charger is expensive and often takes multiple attempts to diagnose.

Charging-port hardware

Charging-port latches that fail, ports that don’t release the connector, and corrosion in port connectors can produce repeated repair visits and substantial out-of-service time. The 30-day cumulative out-of-service threshold is often met quickly in charging-system cases because of long parts-order lead times.

Drive-unit issues

EV drive units (the electric motor plus single-speed gearbox plus inverter) can fail in characteristic ways:

• Whining or droning noises during acceleration.
• Vibration through the chassis.
• Reduced power output.
• Outright failure requiring complete drive-unit replacement.

Tesla Model S and Model X early production had widely documented drive-unit failures, with many vehicles requiring 2-3 replacements over their warranty period. Multiple drive-unit failures within the warranty term almost always support a Song-Beverly claim.

High-voltage system safety issues

Defects in the high-voltage system (the battery pack, the high-voltage cabling, the inverter, the on-board charger) can be safety-critical:

• High-voltage warning lights with no obvious cause.
• Sudden vehicle shutdowns.
• Sparking or arcing observed during charging.
• Thermal events (battery fires are rare but devastating).

Safety-related high-voltage defects trigger the two-attempt repair threshold under § 1793.22(b)(2) because they fall under “nonconformities likely to cause death or serious bodily injury.”

Regenerative braking issues

EVs use regenerative braking that blends with traditional friction braking. Software bugs in the blending — including failed handoff to friction brakes when regen is unavailable — can cause uneven braking, sudden deceleration, or extended stopping distances. These are safety issues and cross over into brake-system defect territory.

Software-update repair attempts

EVs are intensely software-dependent. Many EV defects are addressed via over-the-air (OTA) software updates rather than dealer visits. Each OTA update targeting a specific defect counts as a repair attempt under § 1793.22, even if no dealer visit occurred.

Tesla in particular has produced extensive California case law on OTA updates as repair attempts. See our electrical and software defects article for more.

What manufacturers typically argue in EV cases

The defense playbook for EV cases includes:

• “Battery degradation is normal.” Sometimes true, but the warranty floor and time-since-purchase context matter.
• “The latest software fixed it.” Frequent argument that pre-update issues are no longer relevant. Counter-argument: each prior update was itself a repair attempt.
• “The buyer’s charging habits caused premature degradation.” Sometimes plausible (constant DC fast-charging accelerates wear), often a stretch.
• “The drive-unit replacement was preventative, not a repair.” Hard to credibly maintain when the vehicle showed prior symptoms.

These defenses are increasingly weak as California case law on EV defects matures.

TSBs and EV willfulness

Major EV manufacturers issue substantial volumes of TSBs for software and battery issues. When a TSB exists for your specific symptom and the manufacturer continued to refuse buyback, that’s strong evidence of willfulness for civil-penalty purposes.

What you should do

If you have EV-specific defects:

1. Document each repair attempt — dealer visits AND OTA updates targeting the issue.
2. Screenshot range estimates and battery capacity reports over time.
3. Save charging-session data when available.
4. Note specific failure modes and conditions.
5. Get a California lemon-law attorney involved — EV cases involve technical complexity that benefits from experienced counsel.

The California lemon-law attorney bar has developed significant EV-specific expertise. Tesla cases, Rivian cases, Lucid cases, Ford F-150 Lightning cases, and various Hyundai/Kia EV cases are all routinely handled with strong settlement outcomes.

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