A disabled remote start on a 2015 Grand Cherokee often signals a hood latch sensor issue. This is the most common reason why your 2015 Jeep Grand Cherokee remote start disabled message appears on the dash. Before you panic or head to a dealer, there are several simple checks you can perform at home.
Many owners see this problem after a cold morning or a car wash. The system is designed to protect you and the vehicle. When it detects something wrong, it shuts down the remote start feature for safety.
2015 Jeep Grand Cherokee Remote Start Disabled
Your Jeep’s remote start system relies on multiple sensors to work. The hood latch sensor is the primary culprit. If the computer thinks the hood is open, it will not allow remote starting. This is a safety feature to prevent you from driving with an unlatched hood.
Other factors can also trigger this message. Low battery voltage, a faulty key fob, or a check engine light can all disable the system. Let’s walk through the troubleshooting steps in order.
Common Causes For Remote Start Failure
The hood latch sensor is a simple switch. It tells the computer if the hood is closed. Over time, the switch can stick or fail. Dirt, debris, or corrosion can cause it to send a false signal.
Another common issue is the hood latch itself. If the latch is not fully engaged, the sensor will not make contact. This can happen if the hood is not slammed shut firmly enough.
Battery problems are also frequent. A weak battery in the Jeep or the key fob can cause the system to act erratically. The remote start requires a certain voltage to operate.
How To Diagnose The Hood Latch Sensor
Start by opening the hood fully. Look at the latch mechanism on the front of the engine bay. You will see a small plastic switch or plunger attached to the latch assembly. This is the hood ajar sensor.
Press the plunger manually with your finger. You should feel it click. If it feels stuck or does not move freely, it may be jammed. Spray some WD-40 or silicone lubricant on the moving parts. Work the plunger back and forth several times.
Close the hood firmly. Listen for a solid click from the latch. Try the remote start again. If it works, the sensor was just sticky. If not, proceed to the next step.
Testing The Sensor With A Multimeter
If lubricating does not help, you can test the sensor electrically. You will need a digital multimeter. Disconnect the wiring harness from the sensor. Set the meter to measure continuity or resistance.
With the plunger released (hood open position), there should be continuity between the two wires. When you press the plunger (hood closed position), continuity should break. If the sensor does not change state, it is faulty and needs replacement.
Replacing the hood latch sensor is straightforward. It usually costs between $20 and $40 for the part. You can find it at any auto parts store or online. The sensor clips into the latch assembly.
Battery Voltage And Remote Start Issues
A low battery in your Jeep can cause the remote start to disable. The system needs at least 12.4 volts to operate. If your battery is below this, the computer may prioritize starting the engine over remote functions.
Check your battery voltage with a multimeter. Connect the red lead to the positive terminal and the black lead to the negative terminal. A healthy battery reads around 12.6 volts when the engine is off. If it reads below 12.4 volts, charge the battery or replace it.
Also check the battery in your key fob. A weak fob battery can cause intermittent remote start failures. Replace the CR2032 battery in the fob if it is more than a year old. This is a cheap and easy fix.
How To Replace Key Fob Battery
Insert a small flathead screwdriver into the slot on the side of the fob. Twist gently to separate the two halves. Remove the old battery and note its orientation. Insert the new battery with the positive side facing up. Snap the fob back together.
Test the remote start after replacing the battery. If it still does not work, the issue is likely elsewhere. But this is a good maintenance step regardless.
Check Engine Light And Remote Start Disable
Your Jeep’s remote start will disable if the check engine light is on. This is a safety precaution. The computer does not want to start the engine if there is a potential problem. Even a minor issue like a loose gas cap can trigger this.
Check your dashboard for any warning lights. If the check engine light is illuminated, you need to diagnose the trouble code. Use an OBD2 scanner to read the code. Auto parts stores often read codes for free.
Common codes that disable remote start include P0456 (small evaporative leak) and P0300 (random misfire). Fix the underlying issue first. Once the code is cleared and the light goes off, the remote start should work again.
How To Reset The Remote Start System
Sometimes the system just needs a reset. This can clear temporary glitches. Start by disconnecting the negative battery terminal. Wait for about 10 minutes. This drains residual power from the computers.
Reconnect the battery terminal. Tighten it securely. Start the engine normally with the key. Let it idle for a few minutes. Turn off the engine. Try the remote start again. This simple reset fixes many electronic issues.
If the problem persists, you may need to perform a more specific reset. Some owners report success by cycling the ignition key 5 times quickly. Others use the remote start button sequence: press lock, then press and hold the remote start button for 2 seconds.
Door And Trunk Sensor Interference
All doors and the trunk must be fully closed for remote start to work. If any door is ajar, the system will disable. Check all doors including the rear liftgate. Make sure they are latched securely.
Sometimes a door latch sensor can fail. This is less common than the hood sensor but possible. If you suspect a door sensor, look for a dome light that stays on when the door is closed. That indicates a faulty sensor.
You can test door sensors by opening each door one at a time. Watch the dashboard indicator for door ajar. If a door does not show as open when it is, the sensor is stuck. Clean the latch area with electrical contact cleaner.
Aftermarket Remote Start Systems
If your Jeep has an aftermarket remote start system, the troubleshooting is different. Aftermarket systems have their own sensors and wiring. They can interfere with the factory system. Check the aftermarket system’s manual for error codes.
Common aftermarket issues include poor installation, loose connections, or a dead backup battery. Some systems have a valet mode that disables remote start. Make sure valet mode is turned off.
If you are unsure about the system, consult a professional installer. They can diagnose the specific aftermarket components. Do not attempt to modify factory wiring unless you are experienced.
When To Visit A Dealer Or Mechanic
If you have tried all the above steps and the remote start still says disabled, it may be a deeper issue. The body control module (BCM) or the remote start module itself could be faulty. These require specialized diagnostic tools.
A dealer can reprogram the system or update the software. Sometimes a software update fixes intermittent remote start problems. This is covered under warranty if your Jeep is still within the warranty period.
Also consider that the hood latch sensor wiring harness may be damaged. Wires can break inside the insulation due to engine heat and vibration. A mechanic can test the wiring continuity from the sensor to the BCM.
Preventive Maintenance Tips
To avoid future remote start issues, keep the hood latch area clean. Wash off road salt and grime regularly. Lubricate the latch and sensor plunger every few months. Use a silicone-based lubricant, not grease.
Replace your key fob battery annually. This prevents weak signal issues. Also keep your Jeep’s main battery in good condition. Have it tested at every oil change. A battery that is 4 years old or older is prone to failure.
If you live in a cold climate, the hood latch can freeze. This can cause the sensor to stick. Apply a de-icer to the latch before trying to remote start. Some owners install a hood latch heater pad for winter.
Frequently Asked Questions
Q: Why does my 2015 Jeep Grand Cherokee remote start disabled message appear only in cold weather?
A: Cold weather can cause the hood latch sensor to stick or freeze. Moisture in the latch mechanism freezes, preventing the plunger from moving. Lubricating the latch and using de-icer helps.
Q: Can a dead key fob battery cause the remote start disabled message?
A: Yes, a weak key fob battery can cause intermittent remote start failures. The fob may not send a strong enough signal to the vehicle. Replace the CR2032 battery in the fob.
Q: Will disconnecting the battery reset the remote start system?
A: Yes, disconnecting the negative battery terminal for 10 minutes can reset the system. This clears temporary glitches in the computer. Reconnect and test the remote start.
Q: How much does it cost to fix a hood latch sensor on a 2015 Grand Cherokee?
A: The sensor part costs between $20 and $40. Labor at a shop is typically $50 to $100. You can replace it yourself in about 15 minutes with basic tools.
Q: Does the check engine light always disable remote start?
A: Yes, any active check engine light will disable the remote start system. You must diagnose and fix the trouble code first. Once the light is off, remote start should work.
We hope this guide helps you get your 2015 Jeep Grand Cherokee remote start working again. Most issues are simple to fix at home. Start with the hood latch sensor and battery checks. If all else fails, a professional can handle the deeper diagnostics.
Remember to always close the hood firmly after checking the sensor. A loose hood can cause the problem to return. With regular maintenance, your remote start should serve you well for years to come.