A malfunctioning remote start system coupled with a glowing check engine light can be frustrating. This comprehensive guide will help you diagnose the problem, offering potential solutions and guiding you towards a resolution. We'll explore common causes, troubleshooting steps, and when professional help is necessary.
What Could Be Causing This Problem?
The simultaneous failure of your remote start and the illumination of your check engine light suggests a potential underlying issue, rather than two separate problems. The connection often lies within the vehicle's computer system and its communication with various components. Here are some possibilities:
- Low Battery: A weak battery can prevent the remote start from engaging and also trigger the check engine light, as various systems rely on sufficient voltage.
- Faulty Remote Start System: The remote start system itself might have a malfunctioning component, such as a faulty receiver, transmitter, or wiring harness.
- Communication Issues: The communication between the remote start system and the vehicle's computer (ECU) could be disrupted. This could be due to a bad connection, a faulty control module, or software glitches.
- Security System Malfunction: Sometimes, an issue with the vehicle's security system can interfere with the remote start function and trigger the check engine light.
- Other Electrical Problems: A broader electrical problem in the vehicle could affect multiple systems, including the remote start and triggering the check engine light as a symptom.
- Software Glitch: In some cases, a software glitch within the vehicle's computer system can cause such issues.
How to Troubleshoot a Non-Working Remote Start and Check Engine Light
Before diving into complex diagnostics, let's start with the basics:
1. Check the Obvious: Battery Voltage
How to: Use a multimeter to check your car battery's voltage. A reading below 12.6 volts when the engine is off indicates a weak battery. A low battery can prevent the remote start from functioning properly and trigger the check engine light.
Solution: If the battery is weak, charge it or replace it.
2. Inspect the Remote Start System Components
How to: Visually inspect the remote start system's components for any visible damage, loose connections, or frayed wires. Check the antenna, the receiver unit, and any wiring harnesses related to the system.
Solution: Repair or replace any damaged components. If you're not comfortable with this, seek professional help.
3. Check the Check Engine Light Codes
How to: Use an OBD-II scanner to retrieve the diagnostic trouble codes (DTCs) stored in your vehicle's computer. These codes provide valuable clues about the problem. Many auto parts stores offer free code reading services.
Solution: Research the specific codes online or consult a repair manual to understand their meaning and potential solutions. This will often point you in the right direction, identifying the specific system or component causing the problem.
4. Examine the Vehicle's Security System
How to: If you have a security system that integrates with the remote start, check its functionality. A problem with the security system could prevent the remote start from activating.
Solution: Consult your vehicle's manual or the security system's documentation for troubleshooting steps. You might need to reset or reprogram the system.
5. Consider Professional Help
If you've completed the above steps and the problem persists, it's time to seek professional help. A qualified mechanic will have the tools and expertise to diagnose the issue accurately and perform the necessary repairs. They can test the wiring harness, check the control modules, and address more complex electrical or software issues.
What if my Remote Start Worked Before, and Now It Doesn't?
Sudden failure suggests a recent development. Consider recent events or maintenance performed on your vehicle. Did you have any work done on the electrical system, battery replacement, or software updates? This information can help pinpoint the cause.
Is it Safe to Drive with a Malfunctioning Remote Start and Check Engine Light?
While driving is generally safe, the check engine light indicates a potential problem that shouldn't be ignored. Continue to drive carefully and schedule an inspection as soon as possible to avoid more serious issues.
By systematically following these steps, you’ll significantly increase your chances of identifying and resolving the problem with your remote start and check engine light. Remember, safety is paramount; if you're unsure about any step, consult a qualified mechanic.
