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2023 Yukon Denali 'Key Fob Not Detected' & No Start

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Mike T. · rep 0 · May 25, 2:39 AM · 1 replies · solved · Question

Vehicle: 2023 GMC Yukon Denali

Hi all,

I'm having a very frustrating intermittent issue with my 2023 GMC Yukon Denali. A few times now, I've gotten into the vehicle, pressed the brake, and then the push-button start, only to be met with a 'Key Fob Not Detected' message on the dash. Of course, the car won't start.

I've tried replacing the key fob battery, and sometimes it works, but then the message comes back a few days later. Both of my fobs are doing it. It's really inconvenient, especially when I'm in a hurry. Is this a common problem with newer Yukons? Could it be a sensor, the immobilizer, or something else electrical? No check engine lights or specific codes have popped up yet.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:39 AM

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ClearTheCode admin answer:

The 'Key Fob Not Detected' message and intermittent no-start condition on your 2023 GMC Yukon Denali points to an issue within the Passive Entry Passive Start (PEPS) system, which relies heavily on various electrical components and modules.

Here are the primary areas to investigate:

  1. Key Fob Battery: While you've replaced it, ensure you're using fresh, high-quality CR2032 batteries. Even new batteries can sometimes be weak. Also, ensure the battery is inserted correctly.
  2. Radio Frequency (RF) Interference: External RF interference can sometimes disrupt the key fob signal. Try starting the vehicle in a different location to rule this out, though it's less common to be a consistent issue.
  3. Remote Control Door Lock Receiver (RCDLR) Module: This module is responsible for receiving the key fob's signal. If the RCDLR is faulty or has a loose connection, it won't properly detect the fob. A diagnostic scan might reveal a communication code like B3055 (No Key Detected) or U0140 (Lost Communication with Body Control Module) if the RCDLR is failing to communicate.
  4. PEPS Antennas: Your Yukon has multiple antennas throughout the cabin that detect the key fob's presence. If one of these antennas is faulty or has a loose wire, it could cause intermittent detection issues. The system might not know the key is inside the vehicle.
  5. Wiring Issues: Damaged or corroded wiring to the RCDLR module or the PEPS antennas could interrupt the signal. This is less common on a new vehicle but not impossible.
  6. Immobilizer System: The vehicle's immobilizer system works in conjunction with the PEPS. If there's a fault here, it will prevent starting even if the key is detected. A diagnostic scan for immobilizer-related codes (e.g., P0513 - Incorrect Immobilizer Key) would be useful.

When to See a Shop: Given that both fobs are exhibiting the issue and you've already tried new batteries, it's highly recommended to take your 2023 Yukon Denali to a GMC dealership. They have specialized diagnostic equipment (like GM's GDS2) that can communicate with the RCDLR and PEPS modules, read specific fault codes, and pinpoint which component (module, antenna, or wiring) is failing. Since it's a new vehicle, it should be covered under warranty.

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