How To Remote Start 2015 Nissan Altima

So, you're having trouble remote starting your 2015 Nissan Altima? It's a common frustration, especially when you're hoping to pre-heat or pre-cool your car before hopping in. The good news is, in most cases, it's a relatively straightforward issue to diagnose and fix. Getting your remote start working again is important not just for convenience, but also for safety in extreme weather conditions. Imagine fumbling with keys in freezing temperatures or having to wait for your car to cool down on a scorching summer day. Addressing this problem promptly improves your overall driving experience and ensures your vehicle is ready when you are.

Symptoms of a Remote Start Issue

Let's break down the most common symptoms you might be experiencing:

• Remote start doesn't respond at all: You press the remote start button, and nothing happens. No lights flash, no engine cranking, nothing.
• The car attempts to start, but fails: The engine cranks, maybe even sputters for a second, but it doesn't fully turn over and start.
• The car starts, but shuts off immediately: The engine starts normally, runs for a few seconds (typically 1-2 seconds), and then shuts itself off.
• The hazard lights flash but the engine doesn't start: This indicates that the remote start system is receiving the signal but there's a reason it's preventing the start.
• "Check Engine" light is illuminated: While not directly a symptom of remote start failure, a lit check engine light will *always* disable the remote start function on your Altima.
• The remote start worked before, but suddenly stopped: This is a particularly frustrating scenario, but it often points to a specific trigger that can be identified.

Root Causes: Why Your Remote Start Isn't Working

The 2015 Nissan Altima's remote start system is designed with safety and security in mind. This means it relies on several inputs to ensure a safe and successful remote start. Here's a breakdown of the most likely culprits:

1. Hood Latch Sensor

The hood latch sensor is a critical safety feature. If the system detects that the hood is open (or the sensor is malfunctioning and *thinks* the hood is open), it will disable the remote start. This prevents accidental starts while someone might be working under the hood.

2. Check Engine Light (CEL)

As mentioned earlier, a check engine light will almost always disable the remote start system. The system is designed to prevent you from unknowingly exacerbating an existing engine problem by running the engine remotely. This is a very common cause. Any stored diagnostic trouble code (DTC) will disable remote start.

3. Door Ajar Sensors

Similar to the hood latch, the system also monitors the door ajar sensors. If any door is not fully closed, the remote start will be disabled to prevent someone from accidentally driving off with an unsecured vehicle.

4. Low Fuel Level

While not as common, an extremely low fuel level can sometimes prevent the remote start from engaging. The system may be programmed to conserve fuel or to prevent potential issues associated with running the engine on fumes.

5. Key Fob Issues

It might seem obvious, but the key fob itself could be the problem. A dead battery in the fob, or a malfunctioning fob (due to damage or programming issues), will prevent the remote start signal from being transmitted. The range of the remote start signal could also be reduced due to a weak fob battery.

6. Brake Switch Sensor

This sensor detects whether the brake pedal is pressed. If this sensor malfunctions and incorrectly registers the brake pedal as being pressed (even when it's not), it can disable the remote start. This is another critical safety feature to prevent unintended acceleration.

7. Aftermarket Alarm Systems

If you have an aftermarket alarm system installed, it could be interfering with the factory remote start. Compatibility issues are common, and sometimes the aftermarket system can override or disable the factory system.

8. System Malfunction

Although less frequent than other issues, there could be a malfunction within the remote start module itself. This requires professional diagnosis and potentially module replacement.

What Happens If You Ignore It?

Ignoring a non-functioning remote start system might seem like a minor inconvenience, but there are potential downsides. First, you lose the convenience of pre-heating or pre-cooling your vehicle, leading to discomfort in extreme weather. Second, depending on the root cause, the underlying issue could worsen over time. For example, a failing sensor might eventually cause other electrical problems. Third, if the problem is related to a safety system (like the hood latch or brake switch sensor), ignoring it could compromise the overall safety of your vehicle.

Recommended Fixes

Here's a step-by-step guide to troubleshooting and fixing your 2015 Nissan Altima's remote start issue:

1. Visual Inspection: Start with a thorough visual inspection. Make sure all doors are fully closed, the hood is latched securely, and there are no obvious signs of damage to any sensors or wiring.
2. Check the Check Engine Light: If the check engine light is on, get the code read by a mechanic or auto parts store. Addressing the underlying engine issue will almost always restore the remote start function.
3. Key Fob Battery: Replace the battery in your key fob. This is a simple and inexpensive fix that often resolves the issue. Try the spare fob.
4. Hood Latch Sensor Test: Locate the hood latch sensor. Manually press the sensor with the hood open. If the remote start begins to work when the sensor is pressed, then the hood latch mechanism is not engaging the sensor properly.
5. Door Ajar Sensors Test: Ensure the interior dome light activates and deactivates reliably when each door is opened and closed. This confirms the door ajar sensors are functioning correctly.
6. Brake Switch Sensor Test: Have a mechanic test the brake switch sensor for proper operation. This often requires specialized diagnostic equipment.
7. Aftermarket Alarm System Inspection: If you have an aftermarket alarm, consult the installation manual or contact the installer to ensure it's not interfering with the factory remote start. Temporarily disabling the aftermarket alarm system can help isolate the problem.
8. Professional Diagnosis: If you've tried the above steps and the remote start is still not working, it's time to take your Altima to a qualified mechanic or Nissan dealership. They have the tools and expertise to diagnose more complex issues, such as a faulty remote start module or wiring problems.

Cost Estimates and Shop Advice

The cost of fixing a remote start issue can vary depending on the root cause:

• Key Fob Battery Replacement: $5 - $10 (DIY)
• Hood Latch Sensor Replacement: $50 - $150 (depending on parts and labor)
• Door Ajar Sensor Replacement: $80 - $200 (depending on parts and labor)
• Brake Switch Sensor Replacement: $70 - $180 (depending on parts and labor)
• Check Engine Light Diagnosis and Repair: $100 - $500+ (depending on the severity of the engine issue)
• Remote Start Module Replacement: $300 - $800+ (depending on parts, labor, and reprogramming)

Shop Advice: When taking your Altima to a mechanic, be sure to clearly describe the symptoms you're experiencing. Mention any recent repairs or modifications that might be relevant. Also, ask for a detailed estimate before authorizing any work. It's always a good idea to get a second opinion if you're unsure about the diagnosis or repair costs.

Credibility and Additional Information

While there isn't a specific TSB (Technical Service Bulletin) solely dedicated to remote start failures on the 2015 Nissan Altima, general TSBs related to electrical system issues or sensor malfunctions could be relevant. Searching online databases for Nissan TSBs related to "electrical faults," "sensor failures," or "remote start system" may reveal helpful information for your mechanic.

Community forums and online resources dedicated to Nissan Altima owners often contain valuable anecdotal data. Many owners share their experiences with remote start issues, including the solutions that worked for them. While not a substitute for professional diagnosis, these resources can provide helpful insights and potential troubleshooting tips.

Based on anecdotal evidence from online forums and discussions, hood latch sensors and key fob batteries are the most frequently reported causes of remote start failures on the 2015 Nissan Altima. Additionally, issues stemming from minor accidents affecting bumper alignment can sometimes prevent the hood latch sensor from working correctly. Addressing these common issues first can often save time and money.