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2017 Outlander Sport: Key Fob Not Detected, Push Button Start Issues

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Mike T. · rep 0 · May 25, 4:09 AM · 1 replies · solved · Question

Vehicle: 2017 Mitsubishi Outlander Sport SE

Hi all, I'm having a frustrating problem with my 2017 Mitsubishi Outlander Sport SE. My key fob isn't being detected, which means I can't use the push-button start. The car just says 'Key not detected' even when the fob is right next to the start button.

I've already replaced the battery in the key fob multiple times with new ones, and it still doesn't work. The remote lock/unlock buttons on the fob work fine, which is confusing. It seems to only be an issue with the proximity detection for starting the car.

Could this be an issue with the car's receiver, or something else entirely? Any advice on what to check next would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:09 AM

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ClearTheCode admin answer:

It's certainly puzzling when your key fob's remote functions (lock/unlock) work, but the push-button start system fails to detect it. This often points to a specific part of the Passive Entry and Start System (PESS) in your 2017 Mitsubishi Outlander Sport SE rather than a dead fob battery.

Troubleshooting Steps:

  1. Try the Spare Key Fob: If you have a second key fob, test it to see if the issue persists. If the spare works, it strongly suggests a fault with your primary fob, even if the battery is new.
  2. Fob in Specific Spot: Many vehicles with push-button start have a specific spot (often a slot in the console or a designated area near the start button) where you can place the fob to ensure detection if the battery is very low or the signal is weak. Try placing your fob directly on the start button or in any designated slot.
  3. Check for Interference: Ensure there are no other electronic devices, large metal objects, or even other key fobs in your pocket or the car that could be interfering with the signal.

Potential Causes:

  • Faulty Key Fob Transponder: While the remote functions (lock/unlock) use one part of the fob's electronics, the proximity detection and transponder chip (for starting) use another. Your fob's transponder or its internal antenna might be failing, even if the remote buttons work.
  • Vehicle's Receiver Antenna: Your Outlander Sport has several antennas located throughout the cabin that detect the key fob's presence. One of these antennas, particularly the one responsible for proximity detection near the ignition, could be faulty or have a loose connection.
  • PESS Control Module: The Passive Entry and Start System control module (sometimes integrated into the Body Control Module or a separate unit) is responsible for interpreting the key fob's signal. A fault in this module could prevent proper detection.
  • Wiring Issues: Less common, but a damaged or corroded wire leading to one of the PESS antennas or the control module could disrupt communication.

When to See a Shop:

If trying your spare key fob doesn't resolve the issue, and you've confirmed no interference, it's time to visit a Mitsubishi dealership or a specialized automotive locksmith. They have diagnostic tools (like the Mitsubishi MUT-III) that can:

  • Read fault codes from the PESS module.
  • Test the signal strength and functionality of your key fob's transponder.
  • Check the integrity of the vehicle's receiver antennas and the PESS control module.

They can accurately pinpoint whether the problem lies with your specific key fob, an antenna, or a control module within the vehicle, and perform any necessary repairs or reprogramming.

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