You're sitting in your 2023 Malibu pressing the start button, but nothing happens because the car can't detect your key fob. This frustrating situation usually has a simple solution, though sometimes it points to a deeper issue.
How Keyless Entry/Start Works
Your Malibu constantly searches for the key fob's low-frequency signal when you're near the vehicle. When detected, it allows door unlocking, entry, and engine starting. If any part of this communication fails, you get "No Key Detected" messages.
Quick Solutions to Try First
- Hold fob against start button: Press the fob directly against the start button and push—this works with dead fob batteries using passive RFID
- Replace fob battery: A CR2032 battery costs a few dollars and is the most common fix
- Try the spare fob: If the spare works, you've confirmed the primary fob is the problem
- Move away from interference: Some locations have radio interference that blocks signals
Common Causes
- Dead or dying fob battery: The most frequent cause by far
- Vehicle battery issues: Low voltage affects the keyless system receivers
- Signal interference: Other devices, building structures, or nearby transmitters
- Damaged fob: Internal circuitry damaged from drops or water
- Receiver antenna issues: The car's antenna system may have faults
- Software glitch: Occasional bugs in the keyless entry module
Symptoms and Variations
- "No Key Detected" or "Key Not Found" message
- Push button doesn't respond at all
- Works intermittently—sometimes detects, sometimes doesn't
- Works only when fob is very close or touching the button
- Remote lock/unlock works but push-start doesn't
Deeper Troubleshooting
- Check if remote lock/unlock functions work from a distance
- Replace the fob battery even if you think it's new—batteries can be defective
- Check the vehicle's 12V battery condition
- Try starting in a different location to rule out interference
- Have a dealer scan for keyless entry system codes
Repair Costs
- Fob battery: $3-$10
- Key fob replacement: $200-$400
- Key fob reprogramming: $75-$150
- Keyless entry antenna repair: $150-$400
- Keyless entry module replacement: $300-$600