Why car key will not start car?
Why won’t my key start my 2015 Focus?
The keyless entry cars are... let's say, picky about voltage, even with a key backup due to how sensitive these cars can and will be. DO NOT gamble as you might with a normal car with a key; at least if I run a CR2032 dead in a 2008 Camry or key-based Silverado, I have a key to fallback on.
Start with a replacement coin cell (usually CR2032) and see what happens; if it remains, I have cleaned these keyfobs with CRC QD contact cleaner and brought them back to life (sometimes just long enough to use the "existing key" DIY procedure if it has one), but you don't always win.
If neither trick helps, see if reprogramming allows it to start again; if not, you need a new key or there's a disagreement with the immobilizer you can't easily reset with consumer-level tools unless you know someone with an Autel scanner who can do it for you.
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