2025–2026 GMC Terrain key fob battery
The 2025–2026 GMC Terrain key fob takes a CR2450, a 24.5 × 5 mm 3 V lithium cell. Below: how to open it, what to do if it dies, and the manual we checked.
Buy CR2450 batteries CR2450 specs & equivalents
Our pick: Sony CR2450, 5-pack on Amazon, a name-brand cell in child-resistant packaging.
Tip: change the spare key at the same time. Both cells usually age together.
Quick facts
Before you start
- Get a new CR2450 cell from a fresh pack.
- Work over a table or soft cloth so small parts and buttons don’t get lost.
- Note which way the old battery faces before you take it out.
- Keep loose coin cells away from children and pets. See coin battery safety.
How to replace the 2025–2026 GMC Terrain key fob battery
- Press the release button near the bottom of the key and slide out the metal key blade
- Put the tip of the blade in the notch at the bottom centre (not the blade slot) and split the two halves
- Lift off the rubber seal by its pull tab and remove the inner cover
- Take out the old cell without using anything metal
- Fit a new CR2450 with the + side facing up
- Check the silicone seal sits flat with no folds, lay the key buttons-down on a hard surface, press the halves together and refit the blade
Confirmed in the 2025 and 2026 Terrain owner's manuals (CR2450). The key is sealed: seat the rubber seal before closing it.
After you change the battery
- Press lock and unlock from a few metres away. The car should react on the first press.
- On push-button start cars, start the engine once with the fob in your pocket.
- If nothing happens, re-open the fob and check the battery direction and contacts. More fixes: key fob not working after a battery change.
Starting the car if the fob battery is dead
Put the key in the center console (the backup spot named in the owner's manual)|With the vehicle in P (or N), press the brake and ENGINE START/STOP|Replace the key cell soon
General backup methods: how to get in and start with a dead fob.
About the CR2450 battery
CR2450 is a 24.5 mm × 5 mm, 3 V lithium cell with a typical capacity of about 620 mAh. The same size is sold as DL2450, ECR2450, 5029LC. A CR2430 has the same diameter but is thinner, so it can fit loosely and runs down sooner. Stick with CR2450.
Photos from GMC Terrain owners
No owner photos yet for this generation.
Other vehicles that use a CR2450
2025–2026 Buick Enclave2023–2026 Buick Envision2025–2026 Chevrolet Equinox2023–2026 Chevrolet Silverado 15002023–2026 Chevrolet Tahoe2024–2026 Chevrolet Traverse2021–2026 Ford Bronco2025–2026 Ford Bronco Sport2021–2024 Ford Edge2021–2026 Ford Escape2025–2026 Ford Expedition2022–2024 Ford Expedition
Other GMC Terrain years
Questions
What battery does the 2025–2026 GMC Terrain key fob use?
Terrain and Terrain Denali: 1 × CR2450 (smart key).
How many batteries does the 2025–2026 GMC Terrain key fob need?
1 CR2450 cell.
Can I use a CR2430 instead of a CR2450?
It has the same 24.5 mm diameter but is thinner, so it can lose contact and runs down sooner. Use a CR2450.
Which battery names are the same as CR2450?
DL2450, ECR2450, 5029LC are the same size as CR2450.
How do I start the 2025–2026 GMC Terrain if the key fob battery is dead?
Put the key in the center console (the backup spot named in the owner's manual)|With the vehicle in P (or N), press the brake and ENGINE START/STOP|Replace the key cell soon
Do I need to reprogram the key after changing the battery?
Most key fobs keep their pairing when the battery is changed. If the fob stops working, check the battery direction and contacts first; our troubleshooting guide covers the rest.
Related guides
Fob not working after a battery change?Signs the fob battery is dyingStarting a car with a dead fobCR2032 vs CR2025 vs CR2016