Mazda CX-5 key malfunction and electrical fault preventing vehicle start on Mazda CX-5

Some Mazda CX-5 owners report experiencing key malfunctions and electrical faults that prevent their vehicles from starting. Common issues include a dead 12v battery, corrosion on battery terminals, a dead key fob battery, or a malfunctioning alternator. Additionally, some owners have encountered problems with the keyless entry system, requiring frequent key fob battery changes and receiving persistent "low battery" alerts. In colder weather, a discharged starter battery can also hinder starting operations. Even when the key fob is non-functional, the physical key hidden within it can still be used to start the push-to-start vehicle. For those facing keyless system malfunctions, specific troubleshooting steps can help, such as turning on accessory mode and pressing the brake pedal. It is advisable for owners experiencing these issues to inspect the key fob and vehicle batteries, check for corrosion, and consult a professional mechanic or Mazda for further assistance if problems persist.