The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2019 QX50 'Key Not Detected' Message and Starting Issues

0

Mike T. · rep 0 · May 25, 3:49 AM · 1 replies · solved · Question

Vehicle: 2019 Infiniti QX50 Essential

Hey Infiniti community,

I'm having an intermittent but very annoying issue with my 2019 Infiniti QX50 Essential. I keep getting the 'Key Not Detected' message on the dash, even when the key fob is clearly inside the car. This usually prevents me from starting the car with the push-button ignition.

Sometimes, moving the key fob around or pressing the start button multiple times helps, but it's not a reliable fix. I've already replaced the battery in both key fobs, but the problem persists. Is this a common issue with the QX50s? Could it be a sensor or an immobilizer problem?

Any ideas on what could be causing this and how to fix it would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:49 AM

0

ClearTheCode admin answer:

The 'Key Not Detected' message in your 2019 Infiniti QX50, despite having a new key fob battery, points towards a deeper issue within the intelligent key system or vehicle's electrical components.

Common Causes:

  1. Weak Car Battery: While your key fob battery might be new, a weak or dying 12V car battery can cause various electrical gremlins, including issues with key detection and starting.
  2. Interference: Other electronic devices (cell phones, radar detectors, aftermarket chargers) or even strong electromagnetic fields can interfere with the key fob's signal.
  3. Faulty Key Fob Antenna/Receiver: Your QX50 has multiple antennas that detect the key fob's presence. If one of these is faulty or has a loose connection, it won't reliably detect the key.
  4. Intelligent Key Control Unit (IKCU) Malfunction: The module responsible for communicating with the key fob and authorizing starting can fail.
  5. Steering Lock Actuator (ESCL) Issue: In some cases, a failing electronic steering lock can prevent the car from starting, even if the key is detected.

Troubleshooting Steps & OBD Codes:

  1. Try the Backup Method: Most Infiniti vehicles have a backup method to start the car when the key fob battery is low or not detected. Typically, you hold the key fob directly against the start button while pressing it.
  2. Check Car Battery: Have your vehicle's main 12V battery tested. A weak battery can cause these kinds of intermittent electrical issues.
  3. Remove Other Electronics: Try removing all other electronic devices from the car to rule out interference.
  4. OBD Codes: While a 'check engine light' is unlikely, a professional scan tool can often pull B-codes (Body Control Module) or U-codes (Network Communication) related to the intelligent key system, such as B2000 (Control Unit Malfunction) or U1000 (CAN Communication Circuit).

When to See a Shop:

If the issue persists after trying the backup start method, checking your car battery, and ruling out interference, it's essential to visit an Infiniti dealership or a reputable automotive electrical specialist. Diagnosing intelligent key system faults requires specialized equipment to read specific module codes and perform system diagnostics. This is not a problem to ignore, as it can leave you stranded if the car refuses to start altogether.

Menu

Help & account