How to Solve Engine Immobilizer Authentication Failure Preventing Engine Start?
3 Answers
You can try replacing the remote control battery, as it might also be a malfunction in the one-touch start function. Alternatively, there could be an issue with the body control module or the circuit. It is recommended to contact your local 4S dealership for inspection and repair.
Last month my car suddenly wouldn't start, and the screen displayed an 'Engine Anti-theft Authentication Failed' warning, which was really frustrating. I remember it was because the key fob battery was nearly dead - it's quite common to experience signal interference since I often keep the key near my phone. After replacing with a new battery, the problem was resolved. If the spare key doesn't work either, it might indicate a damaged key chip or system malfunction, such as a loose connector in the anti-theft module. It's important to keep keys away from strong magnetic sources and regularly check battery life. If the issue recurs frequently, it's best to take the car to a professional repair shop. They can scan for trouble codes using diagnostic equipment to identify the problem accurately. Avoid DIY attempts that might turn minor issues into major safety hazards affecting driving security.
That day I was in a hurry to get to work, but the car just wouldn't start, showing an anti-theft authentication failure. I suspected the key signal was being interfered with, perhaps by a nearby Wi-Fi router or other electronic devices. I tried placing the key close to the start button, which sometimes tricks the system. If that didn't work, trying the spare key might help, as the main key could be worn out. Aging batteries are also a common issue—just spend a few bucks on a new button battery to replace it. In the end, I had no choice but to call a tow truck to take it to the dealership, where they found the anti-theft module was faulty. It cost a bit to fix. Now I've learned my lesson—I keep the key separate on a keychain, avoiding contact with other items to reduce such hassles and prevent unnecessary trouble and expenses.
