Most often, a 2019 remote start stops working because the key fob isn’t detected or safety/state conditions aren’t met—like the car thinking the engine isn’t allowed to start remotely. A weak key fob battery, a drained main 12V battery, or a misconfigured remote-start module are common culprits.
In more detail, remote start failure can involve the vehicle's immobilizer system not recognizing the programmed key, a safety condition such as doors or hood not closed, or a fault in the factory or aftermarket remote-start hardware. Depending on the model, weather, and installation, the fix ranges from a simple fob battery replacement to dealer reprogramming or module repair.
Quick checks to perform at home
Before you start the checks, keep in mind these steps cover both factory and aftermarket systems and address the most frequent, fixable causes.
- Check the key fob battery and replace it if weak; a dead fob is the most common reason remote start won’t respond.
- Verify the vehicle is in Park, all doors and the hood are closed, and you are within normal remote range when attempting start.
- Ensure the doors are locked and look for any immobilizer or security indicator on the dash; a key mismatch or immobilizer fault can disable remote start.
- Test with a spare key fob if available to determine whether the issue is with the original fob.
- Check the main 12V battery in the car; a weak or failing battery can prevent cranking even if the key fob is working.
- Consider interference or range issues (heavy walls, metal structures, or other RF devices) that can block the signal.
These basic checks cover the majority of non-technical failures. If none resolve the issue, move on to deeper troubleshooting or seek professional help.
Factory remote start vs aftermarket system
Factory remote start is integrated with the vehicle’s security and ignition systems, while aftermarket systems are added by third parties and can be sensitive to wiring, compatibility, and software. Aftermarket modules may require reprogramming after battery changes or software updates, and some dealers may have limited ability to service non-factory installations.
Deeper troubleshooting and service options
If quick checks don’t fix the problem, try these more thorough steps. Some actions may require professional tools or expertise.
- Check the car’s 12V battery health with a load test; insufficient cranking power can block remote start.
- Inspect fuses and relays related to the remote-start circuit in the vehicle and, for aftermarket setups, in the module harness; replace any blown components per the manual or installer’s guidance.
- Confirm key fob pairing or re-pair the fob with the car or app if applicable; incorrect pairing can disable remote start.
- Look for software updates or recalls affecting remote-start functionality using your Vehicle Identification Number (VIN) on the manufacturer’s site or through the dealer.
- If you have an aftermarket remote-start system, contact the installer to review wiring, connectors, and module status; wiring faults or miscommunication with the vehicle CAN bus are common culprits.
- Use a diagnostic scanner to check for immobilizer, ignition, or security-system fault codes that could block remote start.
If issues persist after these steps, schedule service with the dealer or a certified automotive technician, or return to the installer for a thorough inspection of an aftermarket system.
Summary
For a 2019 model, remote start failures most often boil down to a dead or undetected key fob, a weak vehicle battery, or a safety/immobilizer condition preventing remote ignition. Start with simple checks—fob battery, vehicle state, and range—before moving to power and wiring diagnostics, software updates, or professional service. Understanding whether you’re dealing with factory or aftermarket hardware will guide the right next steps and help you get back to the comfort of a remote-started ride.