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Truck in question: 2001 Silverado 1500 LT Z71 (w/ Stock Keyless Entry System) Okay, I really didn't want to make a forum post, but I've scoured the hivemind for answers and I have found none. Recently I ordered new batteries for my 15732803 key fob that was showing signs of a weak battery. i.e. Required holding button longer than before, and requiring me to stand closer. I removed the old battery about 12 hours before installing a new one. (idk why I did this, but I didn't think it would cause issues.) I tested the fob at Pep-Boys on one of those Energizer fob testers. Seems to work fine! After installing the battery, I followed the instructions on the inside of the fob case. "Press and hold LOCK & UNLOCK for 7 seconds". I did this, but I received no response from the truck. I tried this several times to no avail. At this point I assume that removing the battery for an extended period caused the rolling codes to become lost or out of sync... I begin attempting to enter programming mode as per my trucks service manual. This is where I am having problems. I followed the service manual and a multitude of other online resources that gave me the same, or slightly differing instructions. However, the locks NEVER cycle when I release the drivers-side UNLOCK button. I tried different combinations of this, with different speeds; removing the key, opening and closing the door every time. No luck... The systems worked well for years until I removed and replaced the battery. I respectfully ask that you don't respond with programming instruction from the service manual. I've read it so many times I could recite it by memory. I am certain that it's either a hardware/software issue, or it's a process issue. Maybe I'm performing the procedure too fast? Too slow? Are there known quirks that are undocumented in the service manual? Did I somehow mess something up by leaving the fob battery out for so long? (This seems unlikely since the fob isn't the issue in question) Thank you in advance for anyone who responds.

I have a 2012 Suburban, owned since new. Yesterday the key fob / remote / keyless transmitter stopped working. It stopped, then worked a couple times to unlock, then quit completely. I assumed it was a bad battery (10+ years old), so I replaced it with a new battery, still didn't work. I have the second remote that's only been used a couple times when the keys were "lost", and it doesn't work either. No response from any buttons. I checked the batteries in both, and both batteries are at 3.3 volts. I pulled the DSM fuse for 5 minutes and then disconnected the vehicle battery for 5 minutes, no change. I have tried holding the remote right next to where (I think) the RCDLR is in the left-rear pillar, still no response. The TPMS system works fine, reading all 4 tires correctly with no errors. I hooked up my ODB2 scanner, and it doesn't show any codes. Do I have two dead remotes? Or has the RCDLR partially stopped working? I called the dealer, all they said was "buy a new remote, your two remotes have died". I asked, why would an unused 10 year old remote die? No answer, just come in and buy one. I have no faith in my dealership's service department based on previous repairs unfortunately, so I thought I'd ask here. My local locksmith will attempt a re-sync for $50, but they said if they're both not working it's not that. Unfortunately this year model won't allow the user to add or reprogram a remote. Thanks in advance for any ideas of what to try, or what might be the issue.