Remote keyless fob programming?

DAVID CHEN

MEMBER
2003 CHEVROLET IMPALA
3.4L
6 CYL
AUTOMATIC
121,750 MILES

The set of 2 remote keyless were misplaced about 10years ago, I bought an replacement key and programed. The original 2 keys ( GM /LEAR 10443537) was found last week and try to reprogram again. The first one programmed okay. When reprogramming the second one was done-okay, but the first one is out as deprogrammed, reprogramming first again, the results same problems presented. Pleased tell me how to take care of this situation. Thank you very much.

Tuesday, July 15th, 2025 AT 1:14 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
110,136 POSTS

Hi,

If you were able to program one, I suspect you have a scan tool that can access and communicate with the Body Control Module (BCM). If that is the case, you can program up to four key FOBS, but it must be done during the same session. In other words, you enter the system, program one, and before exiting the setup, you can program as many as you want.

Note that once the vehicle's BCM is placed into this function, the first fob you program will automatically erase all previously learned information.

If you look below, I have attached the directions for the procedure and highlighted what I think is the issue. Please take a look and let me know if this helps.

Take care,

Joe

See pic below.

Image (Click to make bigger)

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Tuesday, July 15th, 2025 AT 8:07 PM

DAVID CHEN

MEMBER
16 POSTS

Dear sir; Excellent. I did follow your instructions that all tree Key Fobs have been programmed and tested, all working perfectly. Thank you very much, have a good day.

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Wednesday, July 16th, 2025 AT 9:07 AM