Lemon Law Attorneys Discuss: Handling Vehicle Performance Issues

If your car hesitates off the line, loses power on the freeway, or stutters through a gear change, it’s more than an annoyance—it can be a serious performance issue. California lemon law attorneys often see these problems crop up in both new and certified pre-owned vehicles under warranty. Below, ZapLemon explains how California’s Lemon Law treats performance defects and what you can do to document repairs and warranty communications—so you have a clear record if you decide to explore your options.

California Lemon Law: Performance Issue Basics

In everyday terms, “performance issues” are problems that keep your vehicle from driving the way it should. Think repeated stalling, rough or delayed shifting, engine misfires, loss of power, surging or hesitation, overheating, turbo lag that won’t resolve, EV battery or range degradation outside normal expectations, or software glitches that cripple drive modes. Under California’s Song-Beverly Consumer Warranty Act (often called the California Lemon Law), a covered “nonconformity” is a defect that substantially impairs the use, value, or safety of your vehicle and occurs during the manufacturer’s warranty period.

The law looks at whether the manufacturer or its authorized repair facilities had a reasonable number of chances to fix the problem. California’s Lemon Law presumption can apply in the first 18 months or 18,000 miles if, for example, the vehicle has been in for four or more repair attempts for the same problem, two or more for a defect likely to cause serious injury or death, or out of service 30 or more cumulative days. These are guidelines, not hard-and-fast rules—cases can qualify outside those windows, and details matter. Performance issues in hybrids and EVs (such as inverter failures or severe range loss) are analyzed much like traditional engine and transmission defects.

If a vehicle meets the law’s requirements, potential remedies can include repurchase or replacement, with a mileage offset for use; however, outcomes depend on the specific facts and documents in your case. Warranty coverage, technical service bulletins, recalls, and software updates can all play a role in how a performance complaint is evaluated. Because every situation is different, a consultation is the best way to understand how the law could apply to your vehicle and warranty history.

How to Track Repairs and Warranty Communications

Strong documentation is key. Each time you visit the dealer, make sure your repair order clearly states your complaint in your own words: when the issue occurs, speeds, temperatures, warning lights, sounds, and how it affects driveability or safety. Ask that the dealer record fault codes, road-test findings, and what was verified—even if they can’t duplicate the problem. Keep copies of all repair orders, invoices (even zero-dollar), tow receipts, loaner or rental agreements, and any photos or videos that capture the hesitation, rough shifts, or power loss.

Create a simple timeline. Note dates the car is in the shop and days it’s unavailable to you, including weekends if the dealer keeps the vehicle. Track mileage at drop-off and pick-up. If the issue returns shortly after a “fix,” write down the date and conditions, and schedule a follow-up promptly. For intermittent problems, quick smartphone videos and screenshots of warning messages can help service advisors and, later, show a pattern.

Communicate in writing when possible. Confirm key conversations by email, and consider sending a written notice of the ongoing defect to the manufacturer’s customer care address listed in your warranty booklet. Stay factual and courteous; attach copies of prior repair orders. Ask for a test drive with a technician if the issue is hard to duplicate, and request that “no problem found” be documented when applicable. Avoid modifications or tune-ups that could complicate warranty coverage. Periodically check for recalls and technical service bulletins that may be relevant to your symptoms, and back up your records in a cloud folder so nothing is lost.