Seeing “remote start disabled” on your Jeep Grand Cherokee often points to a hood latch sensor or battery voltage issue. This message can be frustrating, especially on a cold morning when you want to warm up the cabin before driving. The Remote Start Disabled Jeep Grand Cherokee warning is common, but it is usually fixable without a trip to the dealer. Let’s walk through the most likely causes and simple solutions you can try right now.
Your Jeep’s remote start system relies on several safety checks before it will fire up the engine. If any sensor reports an issue, the system shuts down and shows that message. The good news is that most problems are minor and easy to diagnose yourself. Below, we break down every reason why this happens and how to get your remote start working again.
Common Causes Of Remote Start Disabled Jeep Grand Cherokee
The remote start system in your Grand Cherokee is designed to prevent accidental starts in unsafe conditions. It checks the hood latch, door locks, battery voltage, and even the check engine light. When any of these fail, the system disables itself. Here are the most frequent culprits:
- Hood latch sensor failure – The most common cause. The sensor thinks the hood is open even when it is closed.
- Weak battery – Low voltage in the key fob or vehicle battery can block remote start.
- Door or liftgate not fully closed – Any open door will prevent remote start.
- Check engine light is on – The system will not start if it detects an engine fault.
- Key fob issues – Dead fob battery or signal interference.
- Security system fault – The immobilizer may not recognize the key.
Each of these issues has a simple fix. Let’s go through them one by one, starting with the most likely suspect.
Hood Latch Sensor Problems
The hood latch sensor is a small switch that tells your Jeep whether the hood is securely closed. If it fails, the system thinks the hood is open and disables remote start. This is the number one reason for the “remote start disabled” message on Grand Cherokees.
To test this, open the hood and locate the sensor. It is usually on the driver’s side near the latch mechanism. Press the plunger manually with your finger. If you hear a click, the sensor is working. If not, it may be stuck or broken. Sometimes the sensor gets misaligned after hood adjustments or repairs.
You can temporarily bypass the sensor by pressing it down and holding it while closing the hood. But the real fix is to replace the sensor or adjust its position. Many owners have success by simply cleaning the sensor with electrical contact cleaner.
Battery Voltage Issues
Your Jeep Grand Cherokee needs a certain battery voltage to start remotely. If the battery is weak, the system will disable itself to preserve power for starting. This is especially common in cold weather when batteries lose capacity.
Check the battery voltage with a multimeter. A healthy battery should read around 12.6 volts when the engine is off. If it is below 12.4 volts, charge it or replace it. Also check the key fob battery. A weak fob battery can cause signal issues that trigger the disabled message.
If your vehicle battery is old (over 3 years), consider replacing it. Many Grand Cherokee owners report that a new battery instantly fixes the remote start problem. Jump starting the car can also reset the system temporarily.
Door And Liftgate Sensors
Every door and the liftgate must be fully closed for remote start to work. Even a slightly ajar door will trigger the disabled message. Check all doors, including the rear hatch. Sometimes the sensor in the door latch gets stuck and thinks the door is open.
Open and close each door firmly. Listen for the latch clicking into place. If a door seems loose, the latch may need adjustment. You can also try locking and unlocking the doors with the fob to reset the sensors.
Check Engine Light And Other Faults
The remote start system will not activate if the check engine light is on. This is a safety feature to prevent starting a car with a known problem. Even a minor fault like a loose gas cap can trigger the light and disable remote start.
If your check engine light is on, scan the codes with an OBD2 reader. Common codes that block remote start include P0456 (small evap leak) or P0300 (random misfire). Fix the underlying issue, clear the code, and the remote start should work again.
Other faults like low oil pressure or high coolant temperature can also disable the system. Check your dashboard for any warning lights. If you see one, address it first.
How To Reset Remote Start Disabled Jeep Grand Cherokee
Sometimes the system just needs a reset. Here are step-by-step methods to clear the disabled message and restore function.
Method 1: Battery Disconnect Reset
- Turn off the engine and remove the key from the ignition.
- Open the hood and locate the battery.
- Disconnect the negative (black) terminal first, then the positive (red) terminal.
- Wait at least 15 minutes to drain any residual power.
- Reconnect the positive terminal first, then the negative terminal.
- Close the hood and try remote start again.
This reset clears all temporary faults in the system. It works for many owners. However, you may need to reset your radio presets and clock afterward.
Method 2: Key Fob Reset
- Get inside the Jeep and close all doors.
- Insert the key into the ignition and turn it to the “Run” position (do not start the engine).
- Press and hold the “Lock” button on the key fob for 10 seconds.
- Release the button and turn the ignition off.
- Remove the key and try remote start from outside.
This procedure resynchronizes the fob with the vehicle. It is useful if the fob battery was recently replaced or if the signal dropped.
Method 3: Hood Latch Bypass
- Open the hood and locate the latch sensor plunger.
- Press the plunger down manually and hold it.
- Close the hood while keeping pressure on the plunger.
- Release the plunger once the hood is closed.
- Try remote start immediately.
This is a temporary fix. If it works, you know the sensor is faulty. Replace the sensor as soon as possible.
Diagnosing Remote Start Disabled Jeep Grand Cherokee
If the simple resets do not work, you need to dig deeper. Here is a systematic approach to diagnose the problem.
Check For Error Codes
Use an OBD2 scanner to read any stored codes. Even if the check engine light is off, there may be pending codes. Look for codes related to the remote start system, such as B1A00 (hood switch circuit) or U0100 (lost communication with PCM).
Write down the codes and research them online. Many Grand Cherokee forums have specific fixes for common codes. Clearing the codes may restore remote start, but the underlying issue will return if not fixed.
Test The Hood Switch
The hood switch is a simple two-wire switch. Disconnect the connector and use a multimeter to check continuity. When the plunger is pressed, the circuit should close. When released, it should open. If the switch is stuck open or closed, replace it.
You can also jump the wires temporarily to test. If remote start works with the wires jumped, the switch is bad. Be careful not to short the wires to ground.
Inspect Fuses And Relays
The remote start system has its own fuse and relay in the fuse box. Check the owner’s manual for the exact location. Pull the fuse and inspect it for a broken filament. Replace if blown. Also swap the relay with a known good one from another system (like the horn relay) to test.
Common fuse locations include the under-hood fuse box (Fuse 15 or 20) and the interior fuse panel. A blown fuse is rare but easy to fix.
Check For Software Updates
Some Grand Cherokees have had software updates that fix remote start issues. Visit your dealer or a qualified mechanic to check for TSBs (Technical Service Bulletins). The dealer can update the PCM or BCM software if needed. This is a free fix if your vehicle is under warranty.
Preventing Future Remote Start Disabled Messages
Once you fix the problem, take steps to prevent it from happening again. Regular maintenance goes a long way.
- Keep the battery charged – Use a trickle charger if you park for long periods.
- Clean the hood latch sensor – Spray it with contact cleaner every few months.
- Replace key fob batteries yearly – A fresh battery ensures strong signal.
- Fix check engine lights promptly – Do not ignore warning lights.
- Lubricate door latches – Use silicone spray to keep sensors working.
Following these tips will minimize the chances of seeing the disabled message again. Most issues are preventable with basic care.
When To Call A Professional
If you have tried all the above steps and the remote start still shows disabled, it may be time for professional help. Complex electrical issues or failed modules require diagnostic equipment you may not have.
Signs you need a mechanic:
- The hood latch sensor tests fine but the system still fails.
- You find blown fuses repeatedly.
- The key fob works for locking but not for remote start.
- You see multiple error codes that you cannot clear.
- The vehicle has aftermarket remote start or security systems.
A dealer or independent shop can run a full system scan and pinpoint the fault. They can also reprogram keys or modules if needed. This is usually the last resort after DIY troubleshooting.
Frequently Asked Questions
Why Does My Jeep Grand Cherokee Say Remote Start Disabled?
The most common reasons are a faulty hood latch sensor, weak battery, or an open door. The system disables itself for safety when it detects any of these conditions. Check the hood sensor first, as it fails most often.
Can I Bypass The Remote Start Disabled Message?
You can temporarily bypass it by pressing the hood latch sensor manually while closing the hood. But this is not a permanent fix. You need to repair the underlying issue to restore full function.
Does A Dead Key Fob Battery Cause Remote Start Disabled?
Yes, a weak key fob battery can cause signal loss and trigger the disabled message. Replace the fob battery with a CR2032 coin cell and try again. This is a cheap and easy fix.
How Do I Reset The Remote Start System On A Jeep Grand Cherokee?
Disconnect the vehicle battery for 15 minutes to reset the system. Alternatively, try the key fob reset method: turn the ignition to Run, hold the Lock button for 10 seconds, then turn off. This resynchronizes the fob.
Will A Check Engine Light Disable Remote Start?
Yes, any check engine light will prevent remote start from working. Fix the underlying issue, clear the code, and the system will function again. Even a loose gas cap can cause this.
Remember, the Remote Start Disabled Jeep Grand Cherokee warning is usually a simple fix. Start with the hood latch sensor and battery check. Most owners resolve it in under an hour without any tools. If you need more help, consult your owner’s manual or a trusted mechanic.
We hope this guide helped you understand and fix the issue. Share it with other Grand Cherokee owners who might be struggling with the same problem. Stay warm and enjoy your remote start once it is working again.