Sorry for the dead thread revival but I thought this was important to share my experience. Especially since there appears to be no normal solution to this.
I got this to add my 3rd key fob and it worked:
It's called the Universal EZ Installer and here's their direct website:
Their website offers almost zero information about it. You'll get more out of the Amazon page and the reviews.
Also mentioned in this thread, I got my 3rd key fob from this site:
https://www.carandtruckremotes.com/2016 ... 43206.html
I know there was some concern that this may not work with a Spark that has DCFC but this one does. Here are the details:
SOME NOTES / ISSUES:
- GM Part Number: 94543206
- Note, the original fobs are PN: 94543205 but the 94543206 works fine so far
- FCC-ID: A2GM3AFUS04
- Some multi-megabyte download for GM cars had to get downloaded. So make sure you have a data connection.
- Had to wait 12 minutes for it do a system scan. I don't think this is typical but I could be wrong.
- Had to pick between the switchblade fob (does work) and smart fob (didn't work)
- Asks you to turn the key in the ignition, which you can't do. I tried pushing the blue start button but that may have caused some of the problems I ran into.
- Had to do the 10 sec push of the blue START button to exit the process.
- I think that previous step (10 sec push) left the car in a weird state. It kept showing the the little Key/Lock icon in the dash display.
- To resolve the key/lock thing, I started the key pair process again but exited out before it kept going with the process.
- Possibly because I exited out of the process in a strange way, I got a few faults in my MIL. Cleared most with my normal OBDII adapter. But it left a persistent one for my parking brake. I think that one will clear on its own.
- I believe the adapter is permanently paired with this specific car when you use it. So keep in mind that it won't be available to other cars after using it once, just this one car.
For starters, I don't normally buy gimmicky gadgets like this. I have a scantool.net OBDII adapter but I've been using their stuff forever. I don't know anything about "Car Keys Express" but my searching showed they are a legit business.
As others on this thread have pointed out, the standard 5 turn key method in the driver's side door does not initiate key pairing. So I looked around for what people do via the OBDII interface. Turns out, that's the other way. There's some fancy software pointed out in this thread that looks like it might work but I wanted to try something cheap/simple.
Also, I want to understand how they do this. I have a Kvaser CAN bus transceiver that should work fine for sniffing the bus traffic. I might be able to see what they are reading / writing and come up with a more reliable solution. It's very annoying that this required a special OBDII adapter just for setting it into pairing mode.