Replace Key Battery medium urgency

2024 Ram 1500 Dead Key Fob Battery: How to Get In, Start, and Replace It

A dead key fob battery on a 2024 Ram 1500 can stop remote lock/unlock and may trigger “Key Fob Not Detected” warnings. The truck can usually still be unlocked and started using built-in backup methods. Here’s what to do right away and your best replacement options in the US.

Understanding Your Situation

The coin-cell battery inside the Ram 1500 key fob has drained (common after 1–3 years depending on use, temperature, and signal range). When voltage drops too low, the fob may not transmit reliably, causing intermittent unlocking, remote start failure, or a no-detect message even though the vehicle itself is fine.

🚀 Immediate Steps to Take

  1. Try your spare fob first (if available) and confirm the issue is only the fob battery, not the truck.
  2. If the truck won’t unlock by buttons, use the hidden/backup mechanical key in the fob to unlock the driver door (alarm may sound briefly).
  3. To start if you see “Key Fob Not Detected,” place the fob as close as possible to the start button (or the designated interior backup read point per your owner’s manual) and press START while holding the brake; then replace the fob battery as soon as possible.

Your Options

Replace the key fob battery yourself (DIY coin-cell swap)

Cost: $3-$12 Time: Same day

Open the fob case carefully, replace the coin-cell battery with the correct type (match the number printed on the old battery), and reassemble. Most 2024 Ram 1500 fobs use a common coin-cell (often CR2032), but confirm by checking the existing battery before buying.

âś“ Pros:
  • Lowest cost and fastest fix
  • No programming required for a simple battery swap
âś— Cons:
  • Risk of damaging the fob housing or seal if pried incorrectly
  • Wrong battery type/poor-quality cells can cause quick repeat failure

Battery replacement at an auto parts store or retailer

Cost: $5-$25 Time: Same day

Many US retailers (auto parts stores, big-box stores, some hardware stores) will help install a coin-cell battery or sell the correct battery on the spot. You still want to confirm the battery type by checking the old one.

âś“ Pros:
  • Convenient and often includes installation help
  • Good option if you don’t want to open the fob yourself
âś— Cons:
  • May not stock the exact battery type at all locations
  • Installation quality varies; fob can be scratched or not fully clipped together

Dealership service department battery replacement

Cost: $15-$60 Time: Same day / 1-3 days (if appointment needed)

A Ram dealer can replace the fob battery and verify the fob is communicating properly. Helpful if you’re also getting “not detected” errors after a new battery or suspect a fob issue beyond the battery.

âś“ Pros:
  • Technicians can confirm whether the problem is battery vs. fob vs. vehicle
  • Good choice if the fob case, buttons, or contacts are damaged
âś— Cons:
  • Higher cost than DIY
  • May require an appointment and travel time

Mobile automotive locksmith check + battery replacement

Cost: $60-$150 Time: Same day

A locksmith can replace the battery and also test for fob damage, weak signal, or other keyless-entry issues. Useful if you’re stranded or the fob still won’t work after a fresh battery.

âś“ Pros:
  • Comes to you (helpful if you can’t reliably start the truck)
  • Can diagnose issues beyond the battery
âś— Cons:
  • More expensive than a simple DIY battery swap
  • Quality varies—use a licensed/insured provider with good reviews

⚠️ What to Avoid

✕ Don’t force the fob open with a large screwdriver—cracked housings and broken clips are common and can lead to moisture damage.

✕ Don’t install a different battery type “that fits” (or a used/unknown-brand coin cell); low-quality cells can cause intermittent detection issues.

✕ Don’t ignore repeated “Key Fob Not Detected” messages after a new battery—this can indicate dirty contacts, a failing fob, or interference that needs troubleshooting.

⚠️ Common Mistakes to Avoid

  • Using wrong battery type
  • Damaging case during opening
  • Not resetting after replacement
  • Buying expensive batteries

Frequently Asked Questions

Can I still start my 2024 Ram 1500 if the key fob battery is dead?

Usually, yes. The truck has a backup method that can read the fob at very close range even when the battery is weak/dead. Place the fob close to the start button or the designated backup read location specified in your owner’s manual, then press START while holding the brake.

Will replacing the key fob battery erase programming or require reprogramming?

In most cases, no. A battery replacement does not typically remove the fob’s programming. If the fob still won’t work after a correct new battery, the issue may be the fob hardware, internal contacts, or a vehicle-side problem.

What battery does a 2024 Ram 1500 key fob use?

Many Ram key fobs use a CR2032 coin-cell, but trims and fob styles can vary. The safest approach is to open the fob and match the battery number printed on the old battery before purchasing a replacement.

Why does my truck say “Key Fob Not Detected” even after I replaced the battery?

Common causes include the battery installed upside down, the wrong battery type, poor contact with the battery terminals, a damaged fob (water drop/impact), or radio interference. If reseating the battery doesn’t help, try the spare fob and consider dealer or locksmith diagnostics.

⏱️ Urgency Note: Moderate urgency: you can often drive using the backup start method, but a dead fob battery can leave you locked out or unable to restart after a stop. Replace the battery promptly—especially before long trips or extreme cold/heat.

Related Information

Need Detailed Information?

Get vehicle-specific key fob compatibility, part numbers, and a complete price comparison for your 2024 RAM 1500.

View 1500 Key Fob Guide →

Last updated: 2026-01-04