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2021 Grand Caravan Push-Button Start Intermittent, Key Fob Not Detected

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Mike T. · rep 0 · May 25, 4:17 AM · 1 replies · solved · Question

Vehicle: 2021 Dodge Grand Caravan SXT

My 2021 Dodge Grand Caravan SXT is having issues with the push-button start. Sometimes, it won't detect the key fob, even when it's right there in the cup holder or on my lap. I get a "Key Fob Not Detected" message on the dash, and the engine won't start.

I've replaced the battery in the fob multiple times, but the problem persists intermittently. It's really frustrating when I'm trying to get going, especially with kids in tow. Is there a known issue with the keyless entry or push-button start system in these vans? Could it be a sensor or module problem?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:17 AM

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ClearTheCode admin answer:

The 'Key Fob Not Detected' issue in your 2021 Dodge Grand Caravan SXT can be a common and frustrating problem with modern keyless entry and push-button start systems. Since you've already replaced the fob battery, we can look at other potential causes.

Here are the likely culprits and troubleshooting steps:

  1. Second Key Fob Test: Try using your spare key fob. If the spare works consistently, it indicates an issue with your primary fob (even with a new battery, the fob itself could be faulty).
  2. Fob Placement: Ensure the fob is placed directly in the designated backup location (often a slot in the center console or against the start button) when attempting to start. This location uses a closer-range antenna for detection.
  3. Radio Frequency Interference: Strong RF signals from nearby cell towers, power lines, or even other electronic devices (like certain phone chargers or dash cams) inside your vehicle can interfere with the fob's signal.
  4. Remote Keyless Entry (RKE) Module: This module in the vehicle receives the signal from your key fob. A faulty RKE module or its antenna could be the cause.
  5. Vehicle Battery Voltage: While less common for this specific message, low vehicle battery voltage can sometimes cause electrical anomalies, including issues with module communication.

OBD Codes to Look For: While 'Key Fob Not Detected' might not always trigger a standard P-code, a professional scanner can often pull B-codes (Body codes) related to the RKE module, immobilizer system, or communication issues (e.g., B1A28 - RKE Antenna Performance).

When to See a Shop: If trying the second fob and checking for interference doesn't resolve the problem, it's time to visit a dealership or an automotive electrical specialist. They can diagnose the RKE module, check antenna connections, and potentially reprogram or replace components of the keyless entry system.

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