Pressing the brake pedal firmly while pushing the start button activates the ignition system in a Grand Cherokee. If you are wondering how to start a jeep grand cherokee, the process is simple once you understand the keyless ignition system. This guide covers every step, from basic startup to troubleshooting common issues.
Most modern Grand Cherokees use a push-button start instead of a traditional key. You need to have the key fob inside the vehicle for the system to work. The engine will not start if the fob battery is dead or if the fob is outside the car.
Before you press anything, make sure the gear selector is in Park or Neutral. The vehicle will not start in Drive or Reverse. Also, ensure your foot is pressing the brake pedal firmly—not just resting on it.
How To Start A Jeep Grand Cherokee
This section walks you through the exact sequence for starting the engine. Follow these steps in order for a smooth startup every time.
Step 1: Enter The Vehicle And Close The Door
Sit in the driver’s seat and close all doors. The system checks for the key fob inside the cabin. If a door is open, the startup process may not work correctly.
Step 2: Press The Brake Pedal Firmly
Place your right foot on the brake pedal and push down until you feel resistance. The brake pedal must be depressed for the ignition to engage. Do not pump the pedal—just hold it steady.
Step 3: Locate The Engine Start/Stop Button
The button is usually on the dashboard to the left of the steering wheel, near the steering column. It has a circular icon with the word “START/STOP” or a power symbol.
Step 4: Press And Release The Start Button
With your foot still on the brake, press the button once and release it immediately. Do not hold the button down. The engine should crank and start within 2-3 seconds.
Step 5: Check The Dashboard Indicators
After the engine starts, look at the instrument cluster. The check engine light should turn off after a few seconds. The gear indicator should show “P” for Park.
What To Do If The Engine Does Not Start
Sometimes the engine does not respond. Here are common reasons and fixes for a Grand Cherokee that won’t start.
Key Fob Battery Is Dead
If the key fob battery is low, the vehicle may not detect it. Hold the fob against the start button while pressing the brake. This allows the system to read the fob’s chip even without battery power.
Brake Pedal Not Pressed Hard Enough
The brake pedal sensor can be sensitive. Press the pedal harder than usual. If the dashboard shows “Press Brake Pedal,” you are not applying enough force.
Battery In The Vehicle Is Weak
A weak car battery can prevent the starter from engaging. Jump-start the Grand Cherokee using jumper cables and another vehicle. Connect positive to positive, negative to a metal ground.
Gear Selector Not In Park
If the gear shifter is not fully in Park, the engine will not start. Move the shifter to Park firmly. You may need to wiggle it slightly to engage the park lock.
Using The Remote Start Feature
Many Grand Cherokee models come with remote start. This lets you start the engine from outside the vehicle.
How To Remote Start
- Press the lock button on the key fob once.
- Within 5 seconds, press and hold the remote start button (circular arrow icon) for 2 seconds.
- The turn signals will flash, and the engine will start.
- The vehicle will run for 10 minutes unless you enter and press the brake.
Remote Start Safety
The remote start will not work if the hood is open, the check engine light is on, or the fuel level is low. Also, the vehicle must be locked for remote start to function.
Starting A Grand Cherokee With A Physical Key
Older Grand Cherokee models (pre-2011) use a traditional ignition key. The process is different but still simple.
Insert The Key Into The Ignition Cylinder
The ignition cylinder is on the steering column. Insert the key fully. Do not force it if it does not go in smoothly.
Turn The Key To The Start Position
Turn the key clockwise to the “Start” position. Hold it there until the engine cranks and starts. Release the key immediately once the engine runs.
If The Key Sticks
Sometimes the steering wheel lock engages. Jiggle the steering wheel left and right while turning the key. This releases the lock.
Common Mistakes When Starting A Grand Cherokee
Avoid these errors to prevent damage or frustration.
- Pressing the start button without your foot on the brake—this only turns on accessories.
- Holding the start button down for too long—this can flood the engine.
- Starting the engine while the gear selector is in Drive—the vehicle will lurch forward.
- Using a key fob with a dead battery without holding it to the button.
- Ignoring dashboard warning lights after startup.
Starting In Cold Weather
Cold temperatures can make starting harder. Here is how to handle it.
Let The Glow Plugs Warm Up (Diesel Models)
If you have a diesel Grand Cherokee, wait for the glow plug indicator light to turn off before starting. This takes 5-10 seconds in freezing weather.
Use Remote Start To Warm The Engine
Remote start is ideal in cold weather. It warms the engine and cabin before you get in. The system will shut off after 10 minutes if not entered.
Do Not Pump The Gas Pedal
Modern Grand Cherokees have electronic fuel injection. Pumping the gas pedal does nothing and can cause flooding. Just press the brake and start.
Starting After A Battery Disconnect
If you disconnected the battery, the system may need a reset. Follow these steps.
- Connect the battery terminals securely.
- Close all doors and wait 30 seconds.
- Press the brake pedal and start the engine normally.
- If the engine does not start, turn the ignition to “Run” (without starting) for 10 seconds, then try again.
Understanding The Ignition Modes
The start button has three modes besides starting the engine. Knowing them helps avoid confusion.
- Off: Press the button without your foot on the brake. The system turns off.
- Accessory Mode: Press the button once without the brake. Radio and windows work.
- Run Mode: Press the button twice without the brake. All systems are active but the engine is off.
- Start: Press the button with your foot on the brake. Engine cranks and runs.
Safety Precautions When Starting
Always follow these safety rules.
- Keep your foot on the brake until you are ready to drive.
- Ensure the parking brake is engaged if parked on a slope.
- Do not start the engine in an enclosed space like a garage.
- Check that children or pets are not near the vehicle.
- If the engine cranks slowly, do not keep trying—charge the battery first.
What To Do If The Start Button Stops Working
If the button fails, you can still start the engine manually.
Use The Key Fob Emergency Slot
Some models have a hidden slot near the cup holder or center console. Insert the key fob into the slot. Then press the brake and start button.
Use The Physical Key Inside The Fob
Slide the release button on the back of the fob to remove the physical key. Insert it into the ignition cylinder if your model has one. Otherwise, use the emergency slot.
Jump Start The Starter Relay
This is a last resort. Locate the starter relay in the fuse box under the hood. Swap it with a similar relay from another circuit. If the engine starts, the relay was bad.
Frequently Asked Questions
How do I start a Jeep Grand Cherokee with a dead key fob?
Hold the key fob directly against the start button while pressing the brake. The system will read the fob’s chip even without battery power. If that fails, use the physical key or the emergency slot.
Why does my Jeep Grand Cherokee say “Key Fob Not Detected”?
This usually means the fob battery is dead, the fob is out of range, or there is interference from other devices. Replace the fob battery first. If the problem persists, check for signal blockage.
Can I start my Grand Cherokee without the key fob?
No, the vehicle requires the key fob to be present for the push-button start to work. Without the fob, the immobilizer system prevents the engine from starting.
How long does the remote start run on a Grand Cherokee?
The remote start runs for 10 minutes. You can extend it by pressing the remote start button again within the first 10 minutes. The engine will run for another 10 minutes.
What does it mean when the start button flashes?
A flashing start button usually indicates the system is in accessory mode or the brake pedal is not pressed. Press the brake firmly and try again. If it continues flashing, there may be a fault.
Maintaining The Starting System
Regular maintenance keeps the starting system reliable.
- Replace the key fob battery every 2 years.
- Check the car battery terminals for corrosion.
- Test the starter motor if you hear clicking sounds.
- Keep the brake pedal switch clean and functional.
- Update the vehicle’s software if there are known start issues.
Final Tips For A Smooth Start
Always press the brake pedal all the way down before pressing the start button. If the engine does not start on the first try, wait 10 seconds before trying again. Do not crank the starter for more than 5 seconds at a time.
If you have a diesel model, wait for the glow plug light to turn off. For gasoline models, there is no need to wait—just start immediately. Keep your key fob in a consistent spot, like your pocket or bag, so the system always detects it.
Understanding how to start a jeep grand cherokee correctly saves time and prevents unnecessary wear. Whether you have a push-button start or a traditional key, the process is straightforward once you know the steps. Follow this guide, and you will start your Grand Cherokee without issues every time.