Electric and plug-in hybrid drivers sometimes face a stubborn problem: repeated failures in the high-voltage (HV) cables that carry power between the battery, inverter, and charging components. When a dealership can’t fix those issues within a reasonable number of attempts under warranty, California’s Lemon Law may offer remedies. This article explains how the law treats recurring HV cable defects, what “too many” repairs means, and practical steps you can take to protect your rights.
California Lemon Law: Repeated High-Voltage Cable Failures
High-voltage cables are the arteries of an EV or hybrid. They connect your traction battery to the drive unit and charging system, and a defect can trigger symptoms like “Service High Voltage System” warnings, sudden loss of propulsion, charging failures, or a burning odor. Because HV components are central to safe operation, repeated cable faults can substantially affect the use, value, or safety of the vehicle.
California’s Lemon Law (the Song-Beverly Consumer Warranty Act) requires manufacturers to repair warranty-covered defects within a reasonable number of attempts. If they cannot, the law may require a repurchase or replacement, among other potential remedies. Coverage typically applies to new vehicles purchased or leased in California and can include certain used or certified pre-owned vehicles still under the manufacturer’s warranty. The key is that the defect arises and is addressed under warranty, and that it meaningfully impacts use, value, or safety.
Consider a common scenario: an EV displays intermittent isolation faults and reduced power during highway driving. The dealer replaces an HV cable, then a related harness, and performs software updates, yet the warning returns and the car spends weeks in the shop. Even if the root cause is complex—heat degradation, shielding damage, moisture intrusion, or HVIL (high-voltage interlock loop) issues—multiple unsuccessful attempts to fix the recurring problem can put you within Lemon Law territory. To assess your options, it’s important to document each visit and keep every repair order.
What Counts as Too Many High-Voltage Cable Repairs
California’s Lemon Law includes a “legal presumption” that kicks in within the first 18 months or 18,000 miles (whichever comes first). Under that presumption, the law may consider it a lemon if: the dealer tried to repair the same problem four or more times; or the problem is likely to cause serious injury or death and the dealer tried to fix it two or more times; or the vehicle was out of service for repair for a total of 30 or more days. Even if you fall outside that 18-month/18,000-mile window, you may still have a claim—you just won’t have the presumption and would need to prove the defect and repair history.
For HV cable issues, “the same problem” generally means the same recurring symptom that affects use, value, or safety, even if the dealership replaced different parts along the way. Examples include repeating “unable to charge” errors, isolation fault warnings that lead to limited or no propulsion, or thermal events near the charge port that shut down charging. You do not need to diagnose the exact faulty component yourself—report the symptom consistently and let the authorized dealer attempt the repairs.
To protect your potential claim, keep thorough records. Ask for detailed repair orders showing your complaint, the dealer’s findings, and the work performed. Note dates, miles in and out, and any days waiting for parts. Avoid clearing warning messages yourself before service, and bring the vehicle to an authorized dealership while it’s still under warranty. If the same HV-related symptoms persist despite multiple attempts, consider a consultation to review your situation, your warranty, and your repair history.
This article is for general informational purposes only and is not legal advice. Reading it does not create an attorney–client relationship, and past results do not guarantee a similar outcome. California’s Lemon Law is nuanced, and your rights depend on specific facts, warranties, and timelines. If you believe your vehicle may qualify as a lemon due to repeated high-voltage cable issues, contact ZapLemon for a consultation at (310) 489-3017 or visit https://zaplemon.com. Attorney advertising.