Reprogramming a fob

[belchfire]

My 2018 Silverado was totaled recently.  I'm close to buying another 2018 with lower mileage, but they only offer one key and fob. 

 

1)  Can I reprogram the second fob for my totaled truck to a new one? 

 

2)  Can I do that myself, or will I have to pay a dealer to do it?

 

3)  I'm assuming I can buy a second  key through a dealer?

 

 

[Snowcamo]

Fob code stays the same. The truck alarm gets programed to the fob.

[newdude]

If there is only 1 key with the truck now, dealer has to program in a second.  GM changed the security on everything in 2017 to where if you only have 1 key, you can't do the old rapid learn unless there are two physical keys present.

 

Fobs.  They should be able to use an old one from your truck providing the frequency is a match.  98% of the fobs are 315mHz, there are some that use the 433 mHz fob.

 

Fobs are dealer program item as well or if you have a high end diagnostics tool from Snap On, Mac, OTC.  

 

UPDATE: Quick Learn Procedures for Programming 2017MY Keys and Key Fobs – TechLink (gm-techlink.com)

 

Ignore the part about RKE transmitters, that is only true of push button RKE.  

 

Quote

 

Programming Additional Keys

 

TIP: If only one learned key is present, SPS must be used to add additional keys. The quick learn procedure will not complete with only one learned key. Using only one key for the quick learn procedure will cause the theft security light to illuminate when attempting to start the vehicle.

 

 

Edited November 1, 2021 by newdude

[belchfire]

@newdude, you are a WEALTH of information; thank yo SO MUCH for your input on both of my threads.  I found a YouTube video where a guy is programming fobs for a 2019 in his driveway, so I was hoping I could use my old fob, and do it myself.

 

Are the locks still reading the keys like the old tumbler locks all along, or have the keys gone electronic as well?  I ask, because it's conceivable to me that I could even program the old key to the newer truck, but then, I could believe that the new and old keys would have to match as well.

[newdude]

57 minutes ago, belchfire said:

@newdude, you are a WEALTH of information; thank yo SO MUCH for your input on both of my threads.  I found a YouTube video where a guy is programming fobs for a 2019 in his driveway, so I was hoping I could use my old fob, and do it myself.

 

Are the locks still reading the keys like the old tumbler locks all along, or have the keys gone electronic as well?  I ask, because it's conceivable to me that I could even program the old key to the newer truck, but then, I could believe that the new and old keys would have to match as well.

 

 

Was it a 2019 NEW body style?  If it was, might have been a push button truck with keyless entry and those have a way to program without a tool, but in specific scenarios.

 

The key and fob separate deal GM used to have a way in like 07-13 to do it, but don't any more.  Was mostly on Tahoe/Suburban/Yukon.

 

The mechanical keys have been "chipped" since 2007, and still have them.  So yes, it needs the electrical handshake to start.  A door key with no chip won't start the truck, but would turn the cylinder.  

Edited November 1, 2021 by newdude

[belchfire]

Yes, I believe it was a keyless truck, so you're probably right about the video.

 

Yeah, I knew there is a chip in the key, but I was wondering about a lack of tumblers any more.  It makes sense to me that even the mechanical portion of the key in the ignition may be all electronic now, but the door and the tailgate would still be mechanical, so I'm sure the ignition is still a tumbler cylinder. 

 

Thanks again; I really appreciate all your input!

Belch

[CrawlSlow]

Buy the tool and do it yourself, cheaper vs dealer, plus you now have the tool for other use.