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2019 Tahoe LT - Key Fob Not Detected / Passive Entry Issues

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Mike T. · rep 0 · May 25, 1:41 AM · 1 replies · solved · Question

Vehicle: 2019 Chevrolet Tahoe LT

My 2019 Chevrolet Tahoe LT is having intermittent issues with the key fob. Sometimes it says "No Remote Detected" when I try to start it, even though the fob is right there. Also, the passive entry (unlocking by touching the door handle) only works about half the time.

I've changed the battery in the key fob, and it helped for a day or two, but now the problem is back. Could this be a problem with the vehicle's receiver, or maybe interference? It's really frustrating when I can't get into my truck easily or start it without messing around.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:41 AM

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ClearTheCode admin answer:

Intermittent 'No Remote Detected' messages and passive entry failures in your 2019 Chevrolet Tahoe LT typically point to issues with the Remote Control Door Lock Receiver (RCDLR) module, key fob communication, or environmental interference.

Common Causes:

  1. Key Fob Battery (even if new): While you replaced it, ensure it's a high-quality battery and properly seated. Sometimes a new, cheap battery can be faulty.
  2. RCDLR Module Issues: The RCDLR module is responsible for receiving signals from your key fob. It can develop internal faults, or its connection to the vehicle's network (BCM) might be intermittent.
  3. Wiring Problems: Damaged or loose wiring to the RCDLR module or its antennae (which are often located in various parts of the vehicle for 360-degree detection).
  4. Interference: Strong radio frequency (RF) interference from external sources (e.g., cell towers, power lines, specific building materials) or even other electronic devices inside the vehicle can disrupt key fob signals.
  5. Vehicle Battery Voltage: Low vehicle battery voltage can sometimes cause modules to misbehave, including the RCDLR.

Troubleshooting Steps:

  1. Try Your Spare Fob: If you have a second key fob, test it to see if the problem persists. If the spare works flawlessly, it points to an issue with the primary fob.
  2. Check Vehicle Battery: Ensure your main vehicle battery is in good health and fully charged. Low voltage can cause various electrical gremlins.
  3. Reprogram Fobs: Sometimes, the fobs lose their programming. A dealership can easily reprogram them.
  4. Check for OBD Codes: A professional scanner can often pull B-codes (Body Control Module codes) or U-codes (communication codes) related to the RCDLR module, such as B3100 (Remote Keyless Entry System Malfunction) or U0140 (Lost Communication with Body Control Module).

When to See a Shop:

If trying a different fob, ensuring a good vehicle battery, and checking for external interference don't solve the problem, it's time to visit a Chevrolet dealership. They have specialized diagnostic tools to:

  • Read specific RCDLR module fault codes.
  • Test the signal strength and integrity of the RCDLR antennae.
  • Perform module diagnostics and software updates.
  • Determine if the RCDLR module needs replacement due to an internal fault. This is not a DIY repair due to security programming requirements.
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