These instructions apply to the Honda Accord Mk8 (CU/CW) 2008-2015.
For other models, please choose your vehicle here.
When the Accord’s remote starts working only up close, or the key-indicator warning appears, the fob battery is flat. It takes a single coin cell — a CR1616 — and a couple of minutes, with no reprogramming needed afterward.
The same procedure applies to the North American Accord (2008–2012) — see the US guide.
How to replace the key fob battery on a Honda Accord (2008–2015)
- Slide out the metal emergency key from the remote (this also releases the case on most fobs).
- Gently prise the fob apart at the seam with a small flat screwdriver or a coin.
- Lift out the old cell and fit a new CR1616, matching the polarity (+ side usually faces up).
- Click the case back together and reinsert the metal key.
- Press the lock or unlock button five or six times near the car to re-sync the remote, then test it.
A simple battery change does not wipe the remote’s coding, so no dealer or reprogramming is required — pressing the buttons a few times re-establishes the link with the car.
If the remote still will not operate the locks after a fresh battery, check the cell is seated and the right way round. Adding a brand-new key is different — that needs immobilizer registration with dealer equipment and is not a DIY job.
Frequently asked questions
What battery does the Accord key fob use?
A single CR1616 3-volt coin cell. Always check the marking on the old cell as you remove it, and fit the same type.
Do I need to reprogram the remote after changing the battery?
No. The fob keeps its coding through a battery change; pressing lock/unlock a few times re-syncs it. Reprogramming is only needed when adding a new or replacement key.
The remote still doesn’t work with a new battery — why?
Check the cell is the correct CR1616 and seated with the right polarity. If it still fails, the fob may have water damage, or the car’s receiver needs checking — a new key requires dealer registration.
Independent guide — not affiliated with Honda. Always follow your official service manual and safety precautions. Read our full disclaimer.