Does your car turn off after remote start? Yes, this is a common and frustrating issue that can stem from various problems, ranging from simple fixes to more complex system malfunctions. The good news is that most reasons why your remote start shuts off have identifiable causes and potential solutions.
The convenience of a remote start system is undeniable, especially on a cold morning or a scorching afternoon. It allows you to pre-condition your vehicle’s cabin to a comfortable temperature before you even step outside. However, when your car dies after remote start, that convenience turns into a significant annoyance. This article aims to thoroughly explore the myriad of reasons why your car dies after remote start and provide clear, actionable solutions. We’ll delve into the common culprits behind why your remote start fails, troubleshoot various remote start issues, and explain why your engine cuts out after remote start.
Image Source: i.ytimg.com
Deciphering Common Reasons for Remote Start Shutdown
Several factors can lead to your remote start system failing to keep the engine running. It’s often a delicate balance of electrical signals, battery health, and the integrity of various vehicle components. Let’s break down the most frequent causes.
1. Low Battery Voltage: The Silent Killer
One of the most prevalent reasons your car won’t stay running remote start is a weak or failing car battery. Modern vehicles have numerous electronic systems that draw power, even when the engine is off. Remote start systems themselves also require a consistent power supply to operate correctly.
- How a weak battery affects remote start: If the battery voltage drops too low, the car’s computer may interpret this as a critical fault and shut down the engine to prevent further damage or an inability to restart. The remote start module might also not receive enough stable power to maintain engine operation.
- Symptoms: You might notice other electrical issues like dim headlights, slow cranking when starting the car manually, or warning lights on the dashboard.
- Diagnosis: A simple battery test at an auto parts store or by a mechanic can quickly reveal if your battery is the culprit. They can check the cold-cranking amps (CCA) and overall voltage.
Solutions for Low Battery Voltage:
- Battery Replacement: If the battery is old (typically 3-5 years) or fails the voltage test, replacing it is the most straightforward solution. Ensure you get a battery with the correct specifications for your vehicle.
- Charging the Battery: If the battery is not completely dead but just low, a thorough charging session with a battery charger might suffice. However, if it consistently drains, replacement is usually necessary.
- Checking for Parasitic Draw: A parasitic draw is a component that continues to drain power even when the car is off. This can be caused by faulty modules, aftermarket accessories, or even a stuck relay. A mechanic can perform a parasitic draw test to identify and resolve this.
2. Faulty Alternator: Failing to Recharge
The alternator is responsible for recharging the car’s battery while the engine is running. If the alternator is not functioning correctly, the battery will not be replenished, leading to low voltage. While this might not immediately prevent the car from starting, it can certainly cause it to shut down shortly after a remote start, especially if the battery is already somewhat depleted.
- How a faulty alternator impacts remote start: The remote start system initiates the engine, but without the alternator providing the necessary power, the battery quickly depletes. The car’s systems detect this power shortage and shut down the engine. This can manifest as an intermittent remote start shutdown.
- Symptoms: Dimming headlights while driving, a battery warning light on the dashboard, or a whining noise from the engine bay when accelerating can indicate alternator problems.
Solutions for a Faulty Alternator:
- Alternator Testing: A mechanic can test the alternator’s output to determine if it’s charging the battery adequately.
- Alternator Replacement: If the alternator is found to be faulty, it will need to be replaced. This is a repair best left to experienced professionals.
3. Issues with the Remote Start System Itself
The remote start system is an aftermarket or factory-installed electronic device. Like any electronic component, it can malfunction or be improperly installed, leading to remote start system malfunction.
- Common system faults:
- Faulty remote start module: The main control unit for the remote start system might be damaged or have internal wiring issues.
- Loose or damaged wiring: Connections between the remote start module, the vehicle’s ignition, battery, and starter can become loose or corroded over time, interrupting the signal.
- Incorrect installation: If the system wasn’t installed by a qualified professional, it might have been wired incorrectly, leading to various operational problems.
- Software glitches: Modern remote start systems often have sophisticated software. A glitch in this software can cause unexpected shutdowns.
Solutions for Remote Start System Malfunctions:
- Professional Inspection: The best course of action is to have the remote start system inspected by the installer or a reputable automotive electronics specialist. They can diagnose wiring issues, module failures, and software problems.
- System Reset: Some systems might benefit from a reset. Consult your remote start system’s manual for instructions on how to do this.
- Component Replacement: If a specific component of the remote start system (like the module or a sensor) is identified as faulty, it will need to be replaced.
4. Security System Interfering with Remote Start
Vehicle security systems and aftermarket remote start systems can sometimes conflict. The vehicle’s factory alarm or an aftermarket security system might interpret the remote start sequence as an unauthorized attempt to operate the vehicle, triggering a shutdown. This is a common reason why a security system interfering with remote start causes the engine to cut out.
- How security systems interfere:
- Anti-theft immobilizer: Many modern cars have immobilizer systems that prevent the engine from starting without a correctly programmed key. If the remote start system isn’t properly integrated with the immobilizer, it can prevent the car from staying running.
- Alarm system triggering: If the remote start doesn’t disarm the factory alarm correctly, the alarm might kick in, shutting down the engine to protect the vehicle.
- Data bypass module issues: Most remote start installations for vehicles with immobilizers require a bypass module to trick the car into thinking the key is present. If this module is faulty or improperly configured, it will cause problems.
Solutions for Security System Interference:
- Proper Integration: Ensure that the remote start system was installed with a compatible bypass module designed for your specific vehicle’s make, model, and year.
- Professional Diagnosis: A qualified installer can check the integration between the remote start, alarm, and immobilizer systems. They can reprogram modules or adjust settings to ensure they work in harmony.
- Consult Your Manual: Refer to your vehicle’s owner’s manual and the remote start system’s manual for any specific procedures or known compatibility issues.
5. Fuel System Problems: Not Enough Gas to Keep Going
While less common for remote start issues specifically, an inadequate fuel supply can cause the engine to stall. If your car is low on fuel, the fuel pump might not be able to supply enough fuel under the demand of starting and running, even for a short period.
- How fuel issues affect remote start: The remote start initiates the engine, but if the fuel level is critically low, the engine will sputter and die as it doesn’t receive the continuous fuel supply it needs.
- Symptoms: The engine may run rough, hesitate, or stall unexpectedly, even during normal driving.
Solutions for Fuel System Problems:
- Check Fuel Level: The simplest solution is to ensure your fuel tank isn’t nearly empty.
- Fuel Pump Check: If you have plenty of fuel but the car still stalls, the fuel pump itself might be weak or failing. A mechanic can test fuel pressure to diagnose this.
- Clogged Fuel Filter: A clogged fuel filter can restrict fuel flow. Replacing it is a routine maintenance item that can resolve such issues.
6. Engine Coolant Temperature Sensor (ECT) Faults
The Engine Coolant Temperature (ECT) sensor provides vital information to the car’s engine control module (ECM) about the engine’s operating temperature. If this sensor is faulty, it can send incorrect readings, leading the ECM to mismanage the fuel mixture and ignition timing, potentially causing the engine to stall.
- How an ECT sensor fault impacts remote start: An incorrect temperature reading might cause the ECM to think the engine is either too cold or too hot, leading to an improper startup sequence or an immediate shutdown to prevent damage.
- Symptoms: The engine might run poorly, have poor fuel economy, or the cooling fans might engage erratically. A check engine light is also common.
Solutions for ECT Sensor Faults:
- Diagnostic Scan: A check engine light should be diagnosed with an OBD-II scanner to pinpoint a faulty ECT sensor.
- Sensor Replacement: The ECT sensor can be replaced by a mechanic. It’s a relatively inexpensive part.
7. Other Potential Culprits
Beyond the most common causes, other issues can contribute to your car dies after remote start:
- Idle Air Control (IAC) Valve Issues: The IAC valve controls the engine’s idle speed. If it’s dirty or faulty, the engine might not be able to maintain a stable idle after being started remotely, causing it to stall.
- Vacuum Leaks: Leaks in the intake system can disrupt the air-fuel mixture, leading to rough idling and stalling.
- Ignition System Problems: While less likely to manifest solely with remote start, issues with spark plugs, ignition coils, or wires can cause misfires and poor engine running.
- Transmission Neutral Safety Switch: On automatic transmissions, a neutral safety switch prevents the engine from starting unless the transmission is in Park or Neutral. If this switch is faulty, it could interfere with the remote start signal.
Troubleshooting Steps for Remote Start Shutdowns
When your car turns off after remote start, a systematic approach to troubleshooting can help pinpoint the problem.
Initial Checks:
- Check the Fuel Level: Ensure you have enough gas in the tank. It sounds basic, but it’s an easy oversight.
- Inspect the Battery Terminals: Make sure the battery terminals are clean and the connections are tight. Corroded or loose terminals can impede electrical flow.
- Listen for Unusual Noises: Any strange noises during or after the remote start can provide clues.
- Observe Dashboard Lights: Note any warning lights that illuminate on the dashboard before, during, or after the remote start attempt.
Deeper Dive into Potential Issues:
Here’s a more structured way to approach diagnosis if the initial checks don’t reveal the cause:
Table: Common Remote Start Shutdown Symptoms and Causes
| Symptom | Potential Cause | Solution |
|---|---|---|
| Engine starts then immediately dies | Low battery voltage, faulty remote start module, security system interference. | Test/charge/replace battery, have remote start system inspected, check security system integration. |
| Engine runs for a few seconds then dies | Weak battery, faulty alternator, parasitic draw, incorrect immobilizer bypass. | Test battery and alternator, perform parasitic draw test, ensure proper bypass module installation. |
| Intermittent shutdowns | Loose wiring, intermittent electrical fault, fluctuating battery voltage, faulty sensor. | Inspect all electrical connections, have systems diagnosed by a professional, check for sensor faults. |
| Remote start fails to engage at all | Dead remote start battery, faulty remote fob, security system lockout, blown fuse. | Replace remote fob battery, check remote start system fuse, consult manual for lockout procedures. |
| Car starts but runs very rough | Fuel delivery issue, vacuum leak, spark plug problem, faulty ECT sensor. | Check fuel level, inspect for vacuum leaks, check spark plugs and ignition system, diagnose ECT sensor. |
Diagnostic Tools and Procedures:
- OBD-II Scanner: Essential for checking for diagnostic trouble codes (DTCs) that indicate engine or system malfunctions. Many auto parts stores offer free OBD-II scans.
- Multimeter: Used to test battery voltage, alternator output, and continuity in wiring.
- Professional Diagnostic Equipment: Mechanics use more advanced tools to diagnose specific modules, fuel pressure, and electrical systems.
Addressing Specific Remote Start Issues
Let’s look at how to tackle some of the more specific problems you might encounter.
Why Remote Start Fails to Engage
If your remote start simply won’t do anything – no crank, no lights – the problem might be simpler:
- Remote Fob Battery: The battery in your remote start fob might be dead. Replace it with a fresh one.
- Remote Range: You might be too far away from the vehicle for the signal to reach. Try moving closer.
- Vehicle Safety Features: Some remote start systems have safety kill switches or require the vehicle to be in Park (for automatics) or Neutral (for manuals) with the parking brake engaged. Consult your system’s manual for these requirements.
- Blown Fuse: The remote start system likely has its own fuse. Check your vehicle’s fuse box for any blown fuses related to the aftermarket system.
Engine Cuts Out After Remote Start
This is the core issue we’ve been discussing. It means the engine starts but doesn’t stay running. The common causes outlined earlier (battery, alternator, security system, etc.) are the primary suspects here.
Intermittent Remote Start Shutdown
An intermittent remote start shutdown can be one of the most frustrating because it doesn’t happen every time. This often points to an electrical connection that’s not fully compromised but is susceptible to vibrations or temperature changes.
- Loose Connections: Vibrations can cause a slightly loose wire to lose contact intermittently.
- Fluctuating Voltage: A weak battery or an aging alternator might provide just enough power to start the engine but not enough to keep it running consistently.
- Component Degradation: Some electronic components might be failing, working erratically before complete failure.
Factors Contributing to Remote Start Battery Drain
Remote start systems can indeed contribute to remote start battery drain if not properly managed or if they develop faults.
- Constant Power Draw: Even when not actively starting the car, the remote start module and associated components draw a small amount of power to remain in standby mode, ready to receive a signal.
- Faulty Module: A malfunctioning remote start module might get stuck in a state that draws excessive power.
- Improper Wiring: If the system is wired to draw power continuously from a circuit that shouldn’t be live when the car is off, it will drain the battery.
- Aftermarket Accessories: If other aftermarket electronics are installed and wired improperly, they can compound the battery drain issue, especially when the remote start is also drawing power.
When to Seek Professional Help
While some troubleshooting can be done at home, certain issues require the expertise of a qualified automotive technician or a specialist in car electronics.
- Complex Electrical Diagnosis: If you suspect a parasitic draw, faulty wiring, or a compromised security system, professional diagnostic tools and knowledge are often necessary.
- Alternator or Battery Replacement: While battery replacement can be a DIY task, it’s often best left to professionals to ensure correct installation and terminal cleaning. Alternator replacement is definitely a job for a mechanic.
- Remote Start System Repair/Replacement: If the remote start system itself is faulty, a professional installer can diagnose the issue and recommend repair or replacement. They have the specialized knowledge to work with these aftermarket systems and ensure they integrate correctly with your vehicle.
- Immobilizer Bypass Issues: Dealing with a vehicle’s immobilizer system requires precise knowledge and programming. Incorrect attempts can lead to more significant problems.
Frequently Asked Questions (FAQ)
Q1: Can my remote start system damage my car’s battery?
A1: Yes, if the remote start system is faulty, improperly installed, or if there’s a continuous power draw, it can contribute to your car’s battery draining faster than usual.
Q2: Is it safe to remote start my car in a garage?
A2: No, it is never safe to remote start your car in an enclosed space like a garage. The exhaust fumes contain carbon monoxide, which is a colorless, odorless, and deadly gas. Always ensure adequate ventilation.
Q3: My remote start worked fine yesterday, but not today. What’s wrong?
A3: This could be due to a variety of factors, including a low battery that just happened to have enough charge yesterday, a temporary glitch in the security system, or a loose electrical connection that has shifted.
Q4: How do I know if my remote start system is installed correctly?
A4: A correctly installed system will function reliably without causing other electrical issues in your car. If you experience frequent problems or notice other odd electrical behavior, it’s worth having the installation checked by a professional.
Q5: Can I disable the remote start system if it’s causing problems?
A5: In most cases, yes. If the remote start system is causing significant issues, a professional installer can often disconnect or bypass the system without affecting your car’s normal operation.
Q6: How long should a car battery last?
A6: A car battery typically lasts between 3 to 5 years, depending on climate, driving habits, and the quality of the battery.
By thoroughly investigating these potential causes and employing the suggested troubleshooting steps, you can effectively address why your car turns off after remote start and restore the convenience of this valuable feature.