Owner guide · Hyundai of Goshen · Goshen, IN
How to Replace a Hyundai Key Fob Battery
In the 2027 Palisade manual, Hyundai's instruction for the low key battery message is to replace the smart key battery, and the owner's manual shows how. This guide covers the battery Hyundai specifies, the three-step swap, the things that can interfere with a smart key and how to get going with a weak one. It is based on the 2027 Palisade and 2027 Santa Fe owner's manuals, read October 26, 2026.
CR2450coin battery, 2027 Palisade and Santa Fe
3 stepsfrom the owner's manual
2 keysmaximum registered per Palisade
2 hoursswallowed button battery: severe injury possible within
How do I change the battery in a Hyundai smart key?
Per the 2027 Palisade and Santa Fe manuals: insert a slim tool into the slot and gently open the rear cover, remove the old battery and fit a new CR2450 with the battery positioned correctly, then reinstall the rear cover. If the key still does not work, or you think it is damaged, Hyundai says to contact an authorized Hyundai dealer.
Replace the smart key battery in 3 steps
Both the 2027 Palisade and 2027 Santa Fe manuals list battery type CR2450 and give the same steps:
- Insert a slim tool into the slot and gently open the rear cover.
- Remove the old battery and insert a new one. Check the battery position: Hyundai says an improperly positioned battery may discharge it and cause smart key failure.
- Reinstall the rear cover of the smart key.
If you suspect the smart key is damaged or it is still not working correctly, Hyundai says to contact an authorized Hyundai dealer. You can schedule service online with our team.
The low key battery message
In the cluster display messages of the 2027 Palisade manual, "Low key battery" means that when the Engine Start/Stop button is pressed to OFF, a message may appear saying the smart key's internal battery is low. Hyundai's instruction is to replace the smart key battery.
Other reasons a smart key may not work
A new battery will not fix everything. Both manuals list these conditions under smart key precautions.
| Condition | What Hyundai says |
|---|---|
| Radio transmitters | The key is close to a radio transmitter such as a radio station or airport that may interfere with it. |
| Two-way radios and phones | The key is near a mobile two-way radio system or a mobile phone. Elsewhere in the same section, Hyundai suggests not keeping the key and your phone in the same pocket, especially while the phone is active. |
| Another smart key | Another vehicle's smart key is being operated close to your vehicle. |
| Electronics and cards | The key is near normal electronic devices or credit cards, or near an external device plugged into the power outlet. |
| Vehicle battery | The vehicle battery is discharged. |
| Window tint | Metallic window tint can cause frequency interference and reduce the smart key operating range. |
| Battery fitted wrong | An incorrectly positioned battery can cause smart key failure or premature discharge of the battery. |
From the smart key precautions in the 2027 Palisade and 2027 Santa Fe owner's manuals, read October 26, 2026.
If the smart key does not work correctly, both manuals say you can open and close the door with the mechanical key. If the vehicle battery is the problem rather than the key, see our battery service page.
Starting with a weak key battery
| 2027 model | What the manual says |
|---|---|
| Palisade | If the smart key battery is weak or the key does not work correctly, place the smart key in the smart key slot for emergency starting, then press the Engine Start/Stop button. |
| Santa Fe | If the smart key does not work correctly, press the Engine Start/Stop button directly with the smart key. |
From the smart key sections of the 2027 Palisade and Santa Fe owner's manuals, read October 26, 2026. Other models can differ; check your own manual.
Key care, spare keys and lost keys
Keep it cool and dry
The Palisade manual says moisture or high temperature can make the key's internal circuit malfunction, and that this may not be covered under warranty. Avoid dropping or throwing the key.
Take it with you
Both manuals say to keep the smart key with you when leaving the vehicle, because a key left near the vehicle can discharge the vehicle battery.
Two keys at most
A maximum of two smart keys can be registered to a single vehicle, per the 2027 Palisade manual.
If you lose one
Hyundai says to take the vehicle and the remaining key to an authorized Hyundai dealer right away, or tow the vehicle if necessary.
Coin battery safety
Hyundai's warning in both manuals: the smart key contains a button battery, and a swallowed lithium button battery can cause severe or fatal injuries within 2 hours. Keep batteries out of reach of children, and seek immediate medical attention if you think one has been swallowed or placed inside any part of the body. Dispose of used batteries according to local laws and regulations.
Hyundai of Goshen service hours
| Days | Hours |
|---|---|
| Monday to Friday | 7:30 a.m.-5:30 p.m. |
| Saturday | 8 a.m.-3 p.m. |
| Sunday | Closed |
From Hyundai of Goshen's website, October 26, 2026. Holiday hours can differ.
Hyundai key fob battery questions
What size battery is in a Hyundai smart key?
The 2027 Palisade and 2027 Santa Fe owner's manuals both list a CR2450 coin battery for the smart key. Check your own manual before you buy one, since keys can differ by model.
Will my Hyundai tell me the key battery is low?
The 2027 Palisade manual lists a "Low key battery" cluster message: when the Engine Start/Stop button is pressed to OFF, a message may appear saying the smart key's internal battery is low. Hyundai says to replace the smart key battery.
How do I start a Palisade with a dead key fob?
The 2027 Palisade manual says that if the smart key battery is weak or the key does not work correctly, place the smart key in the smart key slot for emergency starting, then press the Engine Start/Stop button.
How do I start a Santa Fe if the key will not work?
The 2027 Santa Fe manual says to press the Engine Start/Stop button directly with the smart key.
How many smart keys can a Hyundai have?
The 2027 Palisade manual says a maximum of two smart keys can be registered to a single vehicle. If you lose one, Hyundai says to take the vehicle and the remaining key to an authorized Hyundai dealer right away, or tow the vehicle if necessary.
Key fob still acting up?
Visit Hyundai of Goshen at 3202 Elkhart Road in Goshen, IN, and our service team can take a look at the smart key and the vehicle battery.
Sources
Battery type, steps, messages, precautions and warnings are from the 2027 Palisade and 2027 Santa Fe owner's manuals, read October 26, 2026. Other models and years can differ, so your own manual is the final word. Address and hours are from Hyundai of Goshen's own website. Image: Hyundai Motor America.
- 2027 Palisade Owner's Manual: smart key precautions, replacing the battery, smart key slot, loss of a smart key, low key battery message, Hyundai Motor America, read October 26, 2026
- 2027 Santa Fe Owner's Manual: smart key precautions, replacing the battery, starting with the smart key, Hyundai Motor America, read October 26, 2026
- Hyundai owner's manuals and warranties (manual downloads), Hyundai Motor America, read October 26, 2026
- Palisade (image), Hyundai Motor America, October 26, 2026
- Address and service hours (structured data), Hyundai of Goshen, October 26, 2026
- Hyundai service at Hyundai of Goshen, Hyundai of Goshen, October 26, 2026
