Dead Key Fob Battery medium urgency

2024 Acura RDX Dead Key Fob Battery: How to Get In, Start, and Replace It

A dead key fob battery on a 2024 Acura RDX can prevent remote lock/unlock and may trigger “Keyless Remote Battery Low” warnings. The good news: you can still unlock the door with the hidden mechanical key and start the vehicle using the fob’s backup method until you replace the battery.

Understanding Your Situation

The coin-cell battery inside the RDX keyless remote has discharged, so the fob may not transmit a strong enough signal for keyless entry, remote start (if equipped), or push-button start detection at normal range. The vehicle’s immobilizer/security system is still working—this is typically a power issue in the fob, not a programming failure.

🚀 Immediate Steps to Take

  1. Unlock the driver’s door using the hidden mechanical key inside the fob (release the key and use the door key cylinder/hidden key slot if covered).
  2. Start the RDX using the backup start method: hold the fob against/very near the START/STOP button and press the brake, then press START/STOP (the vehicle can read the fob’s transponder even with a weak/dead battery).
  3. Replace the key fob battery as soon as possible and test lock/unlock and starting before you drive far from home.

Your Options

Replace the coin-cell battery yourself (DIY)

Cost: $3-$12 Time: Same day

Open the Acura key fob case, swap in a new coin-cell battery of the correct type (commonly CR2032 on many Acura/Honda fobs—verify your exact fob or owner’s manual), and reassemble. No reprogramming is usually needed for a simple battery change.

âś“ Pros:
  • Lowest cost and fastest fix
  • Usually restores full range immediately
  • No dealer visit or programming required in most cases
âś— Cons:
  • Risk of damaging the case or seals if pried incorrectly
  • Wrong battery type or upside-down installation can cause continued issues

Have a dealership or independent shop replace the battery

Cost: $0-$30 Time: Same day

Bring the fob to an Acura dealer or a reputable independent shop; they install the correct battery and can confirm the fob is functioning normally.

âś“ Pros:
  • Correct battery and installation with minimal hassle
  • Quick confirmation if the problem is more than the battery
âś— Cons:
  • May require a trip/appointment
  • Some locations charge labor or minimum fees

Replace the key fob (if battery doesn’t solve it)

Cost: $200-$500+ Time: Same day / 1-3 days

If the fob still won’t work after a new battery, the remote may be damaged (water intrusion, cracked circuit board) or the vehicle may have a related issue. A dealer or automotive locksmith can supply and program a replacement fob.

âś“ Pros:
  • Restores full functionality when the original fob has failed
  • Can include cutting the emergency key blade if needed
âś— Cons:
  • Most expensive option
  • Programming may require proof of ownership and may take time

⚠️ What to Avoid

✕ Avoid forcing the fob open with a metal screwdriver that can crack the housing or damage the circuit board—use a proper plastic pry tool if possible.

✕ Avoid touching the new coin-cell battery surfaces excessively; oils can reduce contact quality—handle by the edges.

✕ Avoid assuming it’s a dead battery if the fob was submerged or physically damaged; replace the battery first, but be prepared that the fob may need replacement.

Frequently Asked Questions

Can I drive my 2024 Acura RDX if the key fob battery is dead?

Yes, in most cases you can still unlock the door with the mechanical key and start the vehicle using the backup method (holding the fob against/near the START/STOP button). Replace the battery soon—once you shut the vehicle off, restarting may be harder if the fob is completely dead or not detected.

Do I need to reprogram the key fob after replacing the battery?

Usually no. A standard coin-cell battery replacement typically does not erase programming on Acura/Honda smart keys. If the fob still doesn’t work after a correct battery is installed, the issue may be a damaged fob, a weak contact inside the fob, or a vehicle-side problem.

What battery does the 2024 Acura RDX key fob use?

Many Acura/Honda smart key fobs use a CR2032 coin-cell, but there can be variations by fob design and trim. Check the battery marking on the old battery, the owner’s manual, or the label inside the fob to confirm the exact type before buying.

Why does the fob work only when it’s very close to the car?

That’s a classic sign of a weak coin-cell battery. As voltage drops, the fob’s radio signal range shrinks, so the vehicle only detects it at very close distance or via the backup start reader near the START/STOP button.

⏱️ Urgency Note: Moderate urgency: you can usually get in and start the RDX using the mechanical key and backup start method, but replace the battery promptly to avoid being stranded after the next shutdown or losing remote locking/unlocking.

Related Information

Need Detailed Information?

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

View RDX Key Fob Guide →

Last updated: 2026-01-04