How do I get my remote start to work again?
A quick, practical answer is often that the remote start is failing due to a dead key fob battery or a misconfigured setting. Start with simple checks on the fob, the car’s settings, and safety interlocks—most fixes don’t require a dealer.
Remote start problems fall into two main categories: factory-installed systems that can be enabled or updated by the manufacturer or a dealer, and aftermarket modules added after purchase. This guide covers common causes, practical troubleshooting steps, and when to seek professional help.
Quick checks you can start with
Begin with a fast triage to rule out the most common and easily fixable causes.
- Replace the key fob battery (most are CR2032) and test with a spare if you have one. A weak fob often won’t transmit the start signal reliably.
- Make sure the vehicle is in Park (P) and all doors, including the hood sensor if equipped, are properly closed. Safety interlocks can prevent remote start from engaging if the car isn’t safely parked.
- Verify the remote start feature is enabled in the vehicle’s settings or the manufacturer’s app. Factory systems may need activation, dealer approval, or an app subscription.
- Check the 12-volt main battery and charging system. A failing battery can prevent the car from starting remotely, even if the fob is healthy.
- Inspect fuses and relays related to the remote-start circuit. A blown fuse or faulty relay can disable remote start without warning.
- Look for immobilizer or security warning lights on the dashboard. If the immobilizer is triggered, remote start will be blocked until the issue is resolved.
These quick checks address the most common culprits and often restore remote start without professional assistance.
Deeper troubleshooting by system type
Factory-installed remote start
Factory systems are tied into the vehicle’s ignition and security networks. If the basic checks don’t fix the issue, focus on activation status, key recognition, and safety interlocks.
- Confirm the remote-start feature is enabled for your model. Refer to the owner's manual or contact the dealer to activate or re-activate the function if needed.
- Test key fob recognition. If the car doesn’t sense the fob, the remote start won’t engage. Try a spare key fob if available.
- Verify safety interlocks: transmission in Park, hood properly closed with a functioning hood latch sensor, and doors closed. A faulty sensor can block remote start.
- Check immobilizer/anti-theft status. If the immobilizer is active or reporting a fault, you may need a diagnostic scan to reset or reprogram the system.
- If codes appear, obtain a dealer-grade diagnostic readout. Some models require software updates or reprogramming after battery changes or system updates.
If the issue persists after these steps, contact a dealer or qualified technician who can re-enable features, reprogram keys, or inspect the remote-start module for hardware faults.
Aftermarket remote start
Aftermarket kits add their own control modules and wiring that interact with the vehicle’s electrical system. Troubleshooting focuses on installation accuracy, compatibility, and module status.
- Verify the kit is compatible with your vehicle’s make/model and anti-theft system. Incompatibility can trigger protection features that disable remote start.
- Check remote and app status. Ensure the service plan is active, the device is paired, and the remote is communicating with the module.
- Inspect wiring and connectors for damage, corrosion, or loose connections. Vibration and heat can degrade a poor connection over time.
- Test the kit’s safety circuits (hood switch, door sensors, parking brake input). A false sensor reading can prevent remote start from engaging.
- Reset or re-initialize the system per the manufacturer’s instructions. Some kits require disconnecting power or a specific sequence with the remote to re-sync.
- Check related fuses and relays in the vehicle’s fuse box. A blown fuse can disable the entire remote-start circuit.
Because aftermarket systems vary widely, if these steps don’t resolve the issue, consult the installer or manufacturer support to avoid warranty problems and ensure safe operation.
When to seek professional help
If you still can’t get remote start to work after the above steps, it’s time to involve a professional. A technician can read trouble codes, verify immobilizer function, reprogram keys, test the remote-start module, and check for wiring faults that aren’t obvious. For factory systems, a dealer can re-enable features or update software; for aftermarket systems, a certified installer can confirm compatibility and perform safe, code-compliant wiring.
Safety and legal considerations
Remote start can pose safety risks if used improperly. Always ensure the area around the vehicle is clear before starting, operate in a ventilated space, and follow manufacturer warnings. Some jurisdictions regulate or restrict remote-start usage in certain conditions or climates, so check local laws and warranty terms before making changes.
Summary
Most remote-start problems come down to a few common issues: a weak or dead key fob battery, improper vehicle readiness (Park and closed sensors), inactive remote-start settings, and electrical or immobilizer faults. Start with quick checks on the fob, settings, and safety interlocks; then proceed to system-specific troubleshooting for factory or aftermarket installations. When in doubt, a professional diagnosis can save time and prevent warranty or safety issues.
Does remote start have its own fuse?
Usually it's under the driver dash somewhere. There will be a good amount of wires from a box the size of a drill battery or so. It could be hooked to a fuse in your car's normal fuse box, or have its own inline fuse that's hidden.
Why is my autostart remote not working?
If remote start fails after the car sits, first check the vehicle's battery voltage; a low battery can prevent activation. Inspect the key fob battery and replace if weak. Verify that the brake switch and hood sensor are functioning properly, as these safety features disable remote start if triggered.
How do I reset my remote starter?
Times. This can reset the engine control unit which might fix any communication issues with the remote start module. If those methods do not work you may need to perform a factory reset.
Why is my RC car not responding to the remote?
Also another thing to try, shake the remote lightly side to side while having the wheel facing you so you can see the powered. And see if it's perhaps the battery holder in the remote that is slightly loose somewhere on a row of batteries so that movement causes it to mess up.
