Crankshaft position sensors are tiny components with big jobs—telling your engine control module exactly where the crankshaft is so your engine can fire at the right time. When they fail, cars can stall, hesitate, or refuse to start, often without warning. If your vehicle has repeated crankshaft sensor issues under warranty, California’s Lemon Law may offer remedies. Here’s what to know, in plain language.
Crankshaft Sensor Failures and CA Lemon Law Basics
A crankshaft position sensor monitors the rotation and position of the crankshaft and sends that data to the engine computer to control ignition timing and fuel injection. When it misreads or goes dark, you might experience sudden stalling, hard starting, loss of power, or a check engine light with codes like P0335–P0339. Because failures can be intermittent and heat-related, owners often see “no problem found” on repair orders—until the next stall or no-start.
California’s Lemon Law (part of the Song-Beverly Consumer Warranty Act) protects buyers and lessees of new vehicles—and many used vehicles still under a manufacturer’s warranty—when a substantial defect isn’t fixed after a reasonable number of repair attempts. The law can apply to safety-related problems like sudden stalling just as it can to persistent drivability issues. While every case is unique, California recognizes a “lemon law presumption” during the first 18 months or 18,000 miles that, in general, looks at how many times the car has been in for repairs, whether the issue risks safety, and total days out of service.
If your crankshaft sensor problem continues despite warranty repairs, potential remedies under the law can include a repurchase (buyback) or replacement, among others. The specifics depend on facts like the number of repair attempts, days in the shop, and whether the defect substantially impairs use, value, or safety. This article is for general information only—getting legal advice requires a consultation to evaluate your particular situation.
Signs of a Bad Sensor, Repairs, and Your Options
Common warning signs include intermittent stalling after warm-up, extended cranking or no-start conditions, rough idle, misfires, reduced power, and a flashing or steady check engine light. Some failures happen without storing obvious codes, so documenting symptoms—time, mileage, temperature, weather, and what you were doing when it happened—can be as valuable as the code itself. If the car stalls in traffic or on the freeway, treat it as a safety issue and note that on the repair order.
Repairs might involve replacing the crankshaft sensor itself, updating the engine control module software, inspecting the wiring harness and connectors for heat damage or corrosion, checking the reluctor ring, or addressing oil leaks that contaminate the sensor. If the issue returns, ask the dealer to check for Technical Service Bulletins (TSBs) or recalls and to provide copies. Always request detailed repair orders that list your complaint, the technician’s findings (cause), and the work performed (correction), plus dates and mileage.
If repeated repairs don’t resolve the problem, you have options. Keep all records, including tow bills and rental receipts; communicate in writing; and consider elevating the issue with the manufacturer. California consumers are not required to use manufacturer arbitration, but it’s one potential path. Many owners choose to speak with a lemon law attorney to understand potential remedies like repurchase, replacement, or a cash-and-keep settlement. Deadlines apply under California law, so timely action matters—consultation is the best way to get advice tailored to your facts.
ZapLemon helps California drivers understand their rights when persistent defects—like crankshaft sensor failures that cause stalling or no-starts—aren’t fixed under warranty. This post is for informational purposes only, is not legal advice, and reading it does not create an attorney–client relationship. Every case turns on its specific facts and documents.
If you believe your vehicle may qualify as a lemon, contact ZapLemon through our website or by calling our office to request a consultation. We can review your repair history, discuss your options under California law, and help you decide on next steps. Keep your repair orders handy and reach out when you’re ready.