Ignition key programming

G123 · December 18, 2020

On 5/13/2020 at 11:02 AM, Cojoflo said:

What do you do if you only have 1 programmed key, and one blank for a ‘17 Silverado?

Did you ever figure out what you have to do to program a second key if you only have one working for the 2017 Silverado. I have a second cut key that need program and it requires 2 working.

whosgregm · April 7, 2022

On 6/1/2017 at 9:27 PM, tbarn said:

Just an FYI. This exact process will not work on a '17. There is a process but requires 2 "known" keys to learn new keys. GM has upped security for '17.

I’m trying to program a new spare key. I just tried to do it few minutes ago and it didn’t work. I went in this forum and read your post. Thank you for sharing it. I do have 2 known keys with me. Do you happen to know how to program it with 2 known keys?

tbarn · April 7, 2022

2 hours ago, whosgregm said:

I’m trying to program a new spare key. I just tried to do it few minutes ago and it didn’t work. I went in this forum and read your post. Thank you for sharing it. I do have 2 known keys with me. Do you happen to know how to program it with 2 known keys?

Adding Keys (Without SPS)

Note:

To initiate, this procedure requires that 2 learned key be available.
A total of eight keys maybe be learned to a single vehicle.
This procedure adds keys only. The procedure does not erase previously learned keys.
The keys to be learned must duplicate the mechanical cut of the current key.

Note:

When verifying operation, make sure that no other transmitters are near the vehicle.
If key fails to learn repeat steps 1-6 paying close attention to the time limits at each step.

With a previously learned key, turn the ignition ON.
Turn the ignition OFF and remove the key.
With a second previously learned key, turn the ignition ON.
Turn the ignition OFF and remove the key.
Within 10 seconds of turning OFF the ignition, insert the key to be learned and turn ON/RUN position (do not turn to the crank position). Keep key in the ON/RUN position for 5 seconds and the theft light turns off. The vehicle has now learned the new key.
Note:
- Step 5 can be repeated until a maximum of 8 keys are learned (including 2 factory keys) to the vehicle.
- Be sure to keep other keys and transmitters at least 12 in (30 cm) away from the ignition cylinder while learning.
Verify each transmitter and key is operating properly. Remove key from the ignition cylinder and wait 30 seconds. Insert the key into the ignition cylinder and start vehicle.

KevinK7 · May 20

Very old thread, but hopefully someone will chime in.

SO basic a question, but I gotta ask. Realizing these (straight edge, center cut) keys have chips in them and along with the fobs they need to be programmed to work for our vehicle. But, do the "cuts" in the keys for a particular vehicle need to match? I would assume they MUST match...??

My situation:

I have an '18 Silverado, have an original key and fob, misplaced the 2nd set so I needed replacements.

...went on Ebay and purchased a new "OEM GM" key and fob (from separate sellers). The fob showed up, in a new UNopened GM package, all good there. The key however (from what appears to be a reputable seller), listed as a "New OEM GM key blank..." was in a GM package (albeit opened, taped shut) ...already has a CUT pattern in it.

I'm already in the process of returning it, since it's listed as a "BLANK", and if it's cut (which it is), ...it's not "blank" in my opinion. I would think a cut key is good for only one lock cylinder, so a new cut key is useless to me, unless it matches my truck, ...yet what's puzzle me is I see multiple sellers selling what they are calling "blanks", yet the keys have cuts.

Thanks in advance for any info,

Kevin

GM# 84540865 (Fob)

GM#23209422 (key)

newdude · May 20

3 minutes ago, KevinK7 said:

Very old thread, but hopefully someone will chime in.

SO basic a question, but I gotta ask. Realizing these (straight edge, center cut) keys have chips in them and along with the fobs they need to be programmed to work for our vehicle. But, do the "cuts" in the keys for a particular vehicle need to match? I would assume they MUST match...??

My situation:

I have an '18 Silverado, have an original key and fob, misplaced the 2nd set so I needed replacements.

...went on Ebay and purchased a new "OEM GM" key and fob (from separate sellers). The fob showed up, in a new UNopened GM package, all good there. The key however (from what appears to be a reputable seller), listed as a "New OEM GM key blank..." was in a GM package (albeit opened, taped shut) ...already has a CUT pattern in it.

I'm already in the process of returning it, since it's listed as a "BLANK", and if it's cut (which it is), ...it's not "blank" in my opinion. I would think a cut key is good for only one lock cylinder, so a new cut key is useless to me, unless it matches my truck, ...yet what's puzzle me is I see multiple sellers selling what they are calling "blanks", yet the keys have cuts.

Thanks in advance for any info,

Kevin

GM# 84540865 (Fob)

GM#23209422 (key)

Looks like they sold you some cut key someone never came for as that's an old # for a GM cut key.

The keys must be cut to match your existing key/cylinder. Current blank # is 13523900.

Edited May 20 by newdude

KevinK7 · May 20

54 minutes ago, newdude said:

Looks like they sold you some cut key someone never came for as that's an old # for a GM cut key.

The keys must be cut to match your existing key/cylinder. Current blank # is 13523900.

Thanks! ..especially for the quick reply.

davester · May 21

If you gave them the VIN for your truck, I suppose they may be able to cut the blank for your specific vehicle, but otherwise, it would be a fluke if it worked for your truck (but it is possible, as there are reports of people going to the wrong vehicle in parking lots, and using their key to open/start the vehicle, only to find out later it's the wrong one).