What Causes the 'No Key' Display with One-Button Start?
2 Answers
The reasons for the 'No Key' display with one-button start are: 1. Insufficient key battery power: Although the indicator light may still illuminate when pressing the remote key button, the battery may already be too weak to emit a strong enough radio signal for the sensor to detect, resulting in the 'No Key' display when starting the vehicle; 2. Interference from in-car devices: Equipment such as heads-up displays, navigation systems, and tire pressure monitors may interfere with the sensor's ability to receive signals from the key; 3. Sensor malfunction: If the sensor is faulty or the connector is loose, the vehicle may fail to detect the key; 4. Low vehicle battery power: Insufficient battery power means the vehicle's electrical systems cannot function properly, naturally preventing the remote key from being detected.
Encountering a 'No Key' message with the push-button start, I suspect the key fob battery is dead. My car had a similar issue before—when the key battery is low, the system fails to detect it. It can also trigger if the key is out of the sensing range, like placed too deep in the backseat or a bag, blocking the signal. I recommend first checking the key’s position near the steering wheel and trying to restart the vehicle. If that doesn’t work, the issue could be a damaged key or a faulty vehicle receiver. Interference sources like phones can also affect it, especially when parked near power towers. Keeping a spare key is essential—I’ve made it a habit to replace the key battery every three months to avoid trouble. Another time, my car’s battery was drained, causing the start system to fail—checking the voltage will confirm this. Don’t delay repairs, as it impacts safety.
