Why Wont My Remote Start Work

Why Won't My Remote Start Work? Troubleshooting Guide

Remote start systems offer incredible convenience, especially during harsh weather conditions. However, frustration quickly sets in when your remote start refuses to cooperate. Before you head to the mechanic, this guide will walk you through common reasons why your remote start isn't working and provide troubleshooting steps to get you back up and running.

Understanding Your Remote Start System

First, it's crucial to understand the basics of your specific remote start system. Are you dealing with a factory-installed system or an aftermarket one? Factory systems are typically integrated directly into your car's computer, while aftermarket systems are added on. Understanding this distinction can help you narrow down potential issues.

Furthermore, know the specific features and requirements of your system. Does it require the doors to be locked? Does it have a specific range? Does it require a certain sequence of button presses? Consulting your owner's manual is always a good starting point.

Common Reasons for Remote Start Failure

Several factors can prevent your remote start from functioning correctly. Let's explore some of the most common culprits:

1. Low Battery in Remote or Vehicle

One of the simplest and most overlooked causes is a weak battery, either in your remote control or your vehicle.

• Remote Battery: A depleted battery in your remote control can significantly reduce its range and ability to send a signal. Try replacing the battery with a fresh one.
• Vehicle Battery: A weak or dying car battery can also prevent the remote start from engaging. Most systems are designed to protect the battery and will disable the remote start if the voltage is too low. Check your battery voltage with a multimeter or have it tested at an auto parts store.

2. Hood Latch Sensor Issues

For safety reasons, most remote start systems include a hood latch sensor. This sensor prevents the engine from starting if the hood is open, preventing accidental injuries. If the sensor is faulty or misaligned, the system might think the hood is open even when it's not, thus disabling the remote start.

Troubleshooting: Inspect the hood latch sensor for any damage or loose connections. Try cleaning the sensor and ensuring it's properly aligned. Some systems allow you to temporarily bypass the hood sensor (consult your owner's manual for instructions, but be aware of safety risks). If bypassing allows the remote start to function, you know the sensor is the problem.

3. Door Ajar Sensor Problems

Similar to the hood latch, a faulty door ajar sensor can also prevent the remote start from working. If the system thinks a door is open, it won't allow the engine to start.

Troubleshooting: Make sure all doors, including the trunk or hatch, are completely closed. Check the door ajar indicator light on your dashboard. If it's illuminated even when all doors are closed, a sensor is likely malfunctioning. You may need to have a mechanic diagnose which door sensor is the culprit.

4. Security System Interference

Aftermarket alarm systems or immobilizers can sometimes interfere with the remote start system. Conflicts between these systems can prevent the remote start from functioning correctly.

Troubleshooting: If you have an aftermarket alarm system, try disarming it before using the remote start. If that works, you may need to consult with a professional installer to ensure the two systems are properly integrated.

5. Check Engine Light

A lit check engine light often indicates a problem with your vehicle's engine management system. Many remote start systems are designed to disable if the check engine light is on, preventing further damage to the engine.

Troubleshooting: Have your vehicle's computer scanned for diagnostic trouble codes (DTCs). Once you identify and address the underlying issue causing the check engine light, the remote start should function normally again. Most auto parts stores will perform a scan for free.

6. Faulty Wiring or Connections

Loose, corroded, or damaged wiring is a common cause of remote start problems, especially in aftermarket installations. These issues can disrupt the signals between the remote, the receiver, and the vehicle's computer.

Troubleshooting: Inspect all visible wiring related to the remote start system for any signs of damage. Check connections to ensure they are secure and free of corrosion. If you're comfortable working with electrical systems, you can use a multimeter to test continuity. However, if you're not experienced, it's best to leave this to a professional.

7. Remote Start System Needs Resetting

Sometimes, the remote start system can become "confused" and require a reset. This is similar to restarting a computer.

Troubleshooting: The reset procedure varies depending on the system. Consult your owner's manual for specific instructions. In many cases, it involves disconnecting the vehicle's battery for a short period (e.g., 15 minutes) to reset the system.

8. Range Issues

If you're trying to start your car from too far away, the signal might not be strong enough. Obstructions like buildings and other vehicles can also interfere with the signal.

Troubleshooting: Try moving closer to your vehicle and ensure there are no major obstructions between you and the car. Some remote start systems have an antenna that you can adjust to improve the range.

9. Programming Problems

Aftermarket remote start systems often require programming after installation or battery replacement. If the system isn't properly programmed to recognize your remote, it won't work.

Troubleshooting: Refer to the remote start system's manual for programming instructions. This usually involves a specific sequence of button presses or using a programming tool.

10. System is Disabled

Some remote start systems have a disable feature, either for security purposes or accidental activation prevention. This may be activated by a switch or a specific button combination.

Troubleshooting: Consult your owner's manual to identify if your system has a disable feature and how to re-enable it.

When to Seek Professional Help

If you've tried the troubleshooting steps above and your remote start still isn't working, it's time to seek professional help from a qualified mechanic or car electronics specialist.

Specifically, consult a professional if:

Preventative Maintenance for Your Remote Start System

To minimize the chances of encountering remote start problems, consider the following preventative measures:

Conclusion

A malfunctioning remote start can be frustrating, but by understanding the potential causes and following these troubleshooting steps, you can often resolve the issue yourself. Remember to prioritize safety and consult a professional when necessary. By taking preventative measures and addressing problems promptly, you can enjoy the convenience of your remote start system for years to come. Hopefully, this helps you figure out why your remote start won't work!