If your 2018 Jeep key fob stops unlocking the doors or starting your engine, don’t panic. Most often, the battery is dead, not the fob itself. Replacing the battery is a quick task you can do in minutes, saving you a trip to the dealership and extra costs. This guide will walk you through each step for swapping your Jeep’s key fob battery, explain which battery you need, and share expert tips to avoid common mistakes.
Why Change The Jeep Key Fob Battery?
Your key fob controls your Jeep’s locks, alarm, and remote start. If the battery is low, you might notice:
- The fob works only when you’re close to the Jeep
- Buttons respond slowly, or not at all
- The “Key Fob Battery Low” warning appears on your dash
A weak battery can even leave you locked out. That’s why it’s smart to replace the battery at the first sign of trouble.
What Battery Does A 2018 Jeep Key Fob Use?
Most 2018 Jeep models (including Cherokee, Compass, Grand Cherokee, Wrangler, and Renegade) use a CR2032 3V lithium coin battery. Double-check your owner’s manual or open your fob to confirm. Using the wrong type can cause the fob to malfunction or damage the internal components.
Here’s a quick comparison of common coin batteries to help you identify the right one:
| Battery Type | Diameter (mm) | Voltage | Typical Uses |
|---|---|---|---|
| CR2032 | 20 | 3V | Key fobs, watches |
| CR2025 | 20 | 3V | Calculators, remotes |
| CR2016 | 20 | 3V | Fitness trackers |
What You’ll Need
Before you start, gather these items:
- CR2032 battery (new, from a reputable brand)
- Small flathead screwdriver or a coin
- Clean, dry hands (or gloves)
Optional but helpful: A small tray to hold parts so they don’t roll away.
Step-by-step Guide To Changing The Battery
Follow these simple steps for a successful battery change:
1. Remove The Metal Key
Slide the small lever on the back of your fob. Pull out the metal emergency key. This exposes the seam you’ll open next.
2. Open The Key Fob Case
Insert the flathead screwdriver (or coin) into the seam. Gently twist to separate the two halves. Be careful not to force it, as the plastic can crack.
3. Take Out The Old Battery
Note the battery’s position. Usually, the positive (+) side faces up. Use the screwdriver tip to lift the battery out.
4. Insert The New Battery
Place the new CR2032 battery in the same direction as the old one. Press it gently until it snaps into place.
5. Reassemble The Key Fob
Align the two halves of the fob. Press them together until you hear a click. Slide the metal key back into its slot.
6. Test The Key Fob
Stand near your Jeep and press the lock/unlock buttons. If the fob works, you’re done.
Here’s a summary of the process for quick reference:
| Step | Action | Tip |
|---|---|---|
| 1 | Remove metal key | Push lever and pull key out |
| 2 | Open fob | Use gentle pressure with tool |
| 3 | Remove battery | Remember battery orientation |
| 4 | Insert new battery | + side usually up |
| 5 | Close case | Listen for a click |
| 6 | Test fob | Try all buttons |
Common Mistakes And How To Avoid Them
Many first-timers make errors that can break the fob or leave it unreliable. Avoid these pitfalls:
- Using the wrong battery type – Only use CR2032 for 2018 Jeeps, as others may not fit or power the fob correctly.
- Forcing the case open – If it’s stuck, wiggle the tool gently around the seam instead of prying at one spot.
- Touching the battery contacts – Finger oils can cause corrosion. Use gloves or handle the battery by the edge.
- Forgetting battery direction – Take a photo before removing the old battery for reference.
- Not snapping the case fully shut – Gaps allow moisture in, which can ruin the electronics.
How Long Should A Key Fob Battery Last?
A Jeep key fob battery typically lasts 2–3 years, depending on use and climate. Cold weather, frequent button presses, or storing the fob near electronics can drain the battery faster. If you start noticing weaker signals or need to press buttons multiple times, it’s time to replace the battery.
Can You Use Aftermarket Batteries?
Quality matters. While cheap batteries can save money upfront, they often fail sooner or leak, damaging the fob. Always choose a reputable brand (like Panasonic, Energizer, or Duracell). For more details on battery quality, the Battery University offers helpful insights.
What If The Key Fob Still Doesn’t Work?
If the new battery doesn’t fix the problem:
- Check the battery is installed correctly (positive side up).
- Try a second new battery, in case the first was faulty.
- Make sure the fob case is closed tightly.
- If it still fails, the fob may need to be reprogrammed, or there is an internal issue. Visit your Jeep dealer or a locksmith for help.
Cost Comparison: Diy Vs. Dealership
Changing the battery yourself costs less than $5, while dealerships may charge $30–$50 for the same service.
| Option | Average Cost | Time Needed |
|---|---|---|
| DIY at Home | $3–$5 | 5–10 minutes |
| Dealership/Service Center | $30–$50 | 30–60 minutes |
Frequently Asked Questions
How Do I Know If My Jeep Key Fob Battery Is Low?
Look for a “Key Fob Battery Low” message on your dash or notice the fob only works up close. Slow response or needing multiple presses is also a sign.
Can I Use Cr2025 Instead Of Cr2032?
No, the CR2025 is slightly thinner and may not make proper contact in a 2018 Jeep key fob. Always use the correct battery type for best performance.
Will Changing The Battery Erase My Jeep’s Programming?
No. The key fob’s programming is stored in memory, not the battery. Your fob will work as usual after you insert the new battery.
What Should I Do If The Key Fob Case Is Damaged During Battery Change?
If you crack the case or break a button, you can buy a replacement shell online. Move the internal electronics and battery into the new case, or ask a locksmith for help.
How Often Should I Change My Jeep Key Fob Battery?
Plan to change the battery every 2–3 years, or whenever you notice weaker performance. Keeping a spare battery at home is a smart idea.
Swapping the battery in your 2018 Jeep key fob is quick, cheap, and simple. With a little care and the right tools, you’ll get your remote working like new—no dealership visit required.
